dm: tegra: spi: Convert to driver model

This converts the Tegra SPI drivers to use driver model. This is tested
on:

- Tegra20 - trimslice
- Tegra30 - beaver
- Tegra124 - dalmore

(not tested on Tegra124)

Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/arch-tegra114/tegra114_spi.h

-/*
- * NVIDIA Tegra SPI controller
- *
- * Copyright 2010-2013 NVIDIA Corporation
- *
- * This software may be used and distributed according to the
- * terms of the GNU Public License, Version 2, incorporated
- * herein by reference.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * Version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#ifndef _TEGRA114_SPI_H_
-#define _TEGRA114_SPI_H_
-
-#include <asm/types.h>
-
-int tegra114_spi_init(int *node_list, int count);
-int tegra114_spi_cs_is_valid(unsigned int bus, unsigned int cs);
-struct spi_slave *tegra114_spi_setup_slave(unsigned int bus, unsigned int cs,
-				  unsigned int max_hz, unsigned int mode);
-void tegra114_spi_free_slave(struct spi_slave *slave);
-int tegra114_spi_claim_bus(struct spi_slave *slave);
-void tegra114_spi_cs_activate(struct spi_slave *slave);
-void tegra114_spi_cs_deactivate(struct spi_slave *slave);
-int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-		     const void *data_out, void *data_in, unsigned long flags);
-
-#endif	/* _TEGRA114_SPI_H_ */

arch/arm/include/asm/arch-tegra20/tegra20_sflash.h

-/*
- * NVIDIA Tegra20 SPI-FLASH controller
- *
- * Copyright 2010-2012 NVIDIA Corporation
- *
- * This software may be used and distributed according to the
- * terms of the GNU Public License, Version 2, incorporated
- * herein by reference.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * Version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#ifndef _TEGRA20_SPI_H_
-#define _TEGRA20_SPI_H_
-
-#include <asm/types.h>
-
-int tegra20_spi_cs_is_valid(unsigned int bus, unsigned int cs);
-struct spi_slave *tegra20_spi_setup_slave(unsigned int bus, unsigned int cs,
-				  unsigned int max_hz, unsigned int mode);
-void tegra20_spi_free_slave(struct spi_slave *slave);
-int tegra20_spi_init(int *node_list, int count);
-int tegra20_spi_claim_bus(struct spi_slave *slave);
-void tegra20_spi_cs_activate(struct spi_slave *slave);
-void tegra20_spi_cs_deactivate(struct spi_slave *slave);
-int tegra20_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-	     const void *data_out, void *data_in, unsigned long flags);
-
-#endif	/* _TEGRA20_SPI_H_ */

arch/arm/include/asm/arch-tegra20/tegra20_slink.h

-/*
- * NVIDIA Tegra SPI-SLINK controller
- *
- * Copyright 2010-2013 NVIDIA Corporation
- *
- * This software may be used and distributed according to the
- * terms of the GNU Public License, Version 2, incorporated
- * herein by reference.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * Version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#ifndef _TEGRA30_SPI_H_
-#define _TEGRA30_SPI_H_
-
-#include <asm/types.h>
-
-int tegra30_spi_init(int *node_list, int count);
-int tegra30_spi_cs_is_valid(unsigned int bus, unsigned int cs);
-struct spi_slave *tegra30_spi_setup_slave(unsigned int bus, unsigned int cs,
-				  unsigned int max_hz, unsigned int mode);
-void tegra30_spi_free_slave(struct spi_slave *slave);
-int tegra30_spi_claim_bus(struct spi_slave *slave);
-void tegra30_spi_cs_activate(struct spi_slave *slave);
-void tegra30_spi_cs_deactivate(struct spi_slave *slave);
-int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-		     const void *data_out, void *data_in, unsigned long flags);
-
-#endif	/* _TEGRA30_SPI_H_ */

board/nvidia/common/board.c

@@ -114,9 +114,8 @@ int board_init(void)
 	clock_init();
 	clock_verify();
 
-#ifdef CONFIG_FDT_SPI
+#ifdef CONFIG_TEGRA_SPI
 	pin_mux_spi();
-	spi_init();
 #endif
 
 #ifdef CONFIG_PWM_TEGRA

drivers/spi/Makefile

@@ -40,7 +40,6 @@ obj-$(CONFIG_SANDBOX_SPI) += sandbox_spi.o
 obj-$(CONFIG_SH_SPI) += sh_spi.o
 obj-$(CONFIG_SH_QSPI) += sh_qspi.o
 obj-$(CONFIG_FSL_ESPI) += fsl_espi.o
-obj-$(CONFIG_FDT_SPI) += fdt_spi.o
 obj-$(CONFIG_TEGRA20_SFLASH) += tegra20_sflash.o
 obj-$(CONFIG_TEGRA20_SLINK) += tegra20_slink.o
 obj-$(CONFIG_TEGRA114_SPI) += tegra114_spi.o

drivers/spi/fdt_spi.c

-/*
- * Common fdt based SPI driver front end
- *
- * Copyright (c) 2013 NVIDIA Corporation
- *
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This software is licensed under the terms of the GNU General Public
- * License version 2, as published by the Free Software Foundation, and
- * may be copied, distributed, and modified under those terms.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- */
-
-#include <common.h>
-#include <malloc.h>
-#include <asm/io.h>
-#include <asm/gpio.h>
-#include <asm/arch/clock.h>
-#include <asm/arch-tegra/clk_rst.h>
-#include <asm/arch-tegra20/tegra20_sflash.h>
-#include <asm/arch-tegra20/tegra20_slink.h>
-#include <asm/arch-tegra114/tegra114_spi.h>
-#include <spi.h>
-#include <fdtdec.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-struct fdt_spi_driver {
-	int compat;
-	int max_ctrls;
-	int (*init)(int *node_list, int count);
-	int (*claim_bus)(struct spi_slave *slave);
-	int (*release_bus)(struct spi_slave *slave);
-	int (*cs_is_valid)(unsigned int bus, unsigned int cs);
-	struct spi_slave *(*setup_slave)(unsigned int bus, unsigned int cs,
-					unsigned int max_hz, unsigned int mode);
-	void (*free_slave)(struct spi_slave *slave);
-	void (*cs_activate)(struct spi_slave *slave);
-	void (*cs_deactivate)(struct spi_slave *slave);
-	int (*xfer)(struct spi_slave *slave, unsigned int bitlen,
-		    const void *data_out, void *data_in, unsigned long flags);
-};
-
-static struct fdt_spi_driver fdt_spi_drivers[] = {
-#ifdef CONFIG_TEGRA20_SFLASH
-	{
-		.compat		= COMPAT_NVIDIA_TEGRA20_SFLASH,
-		.max_ctrls	= 1,
-		.init		= tegra20_spi_init,
-		.claim_bus	= tegra20_spi_claim_bus,
-		.cs_is_valid	= tegra20_spi_cs_is_valid,
-		.setup_slave	= tegra20_spi_setup_slave,
-		.free_slave	= tegra20_spi_free_slave,
-		.cs_activate	= tegra20_spi_cs_activate,
-		.cs_deactivate	= tegra20_spi_cs_deactivate,
-		.xfer		= tegra20_spi_xfer,
-	},
-#endif
-#ifdef CONFIG_TEGRA20_SLINK
-	{
-		.compat		= COMPAT_NVIDIA_TEGRA20_SLINK,
-		.max_ctrls	= CONFIG_TEGRA_SLINK_CTRLS,
-		.init		= tegra30_spi_init,
-		.claim_bus	= tegra30_spi_claim_bus,
-		.cs_is_valid	= tegra30_spi_cs_is_valid,
-		.setup_slave	= tegra30_spi_setup_slave,
-		.free_slave	= tegra30_spi_free_slave,
-		.cs_activate	= tegra30_spi_cs_activate,
-		.cs_deactivate	= tegra30_spi_cs_deactivate,
-		.xfer		= tegra30_spi_xfer,
-	},
-#endif
-#ifdef CONFIG_TEGRA114_SPI
-	{
-		.compat		= COMPAT_NVIDIA_TEGRA114_SPI,
-		.max_ctrls	= CONFIG_TEGRA114_SPI_CTRLS,
-		.init		= tegra114_spi_init,
-		.claim_bus	= tegra114_spi_claim_bus,
-		.cs_is_valid	= tegra114_spi_cs_is_valid,
-		.setup_slave	= tegra114_spi_setup_slave,
-		.free_slave	= tegra114_spi_free_slave,
-		.cs_activate	= tegra114_spi_cs_activate,
-		.cs_deactivate	= tegra114_spi_cs_deactivate,
-		.xfer		= tegra114_spi_xfer,
-	},
-#endif
-};
-
-static struct fdt_spi_driver *driver;
-
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	if (!driver)
-		return 0;
-	else if (!driver->cs_is_valid)
-		return 1;
-	else
-		return driver->cs_is_valid(bus, cs);
-}
-
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
-		unsigned int max_hz, unsigned int mode)
-{
-	if (!driver || !driver->setup_slave)
-		return NULL;
-
-	return driver->setup_slave(bus, cs, max_hz, mode);
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
-	if (driver && driver->free_slave)
-		return driver->free_slave(slave);
-}
-
-static int spi_init_driver(struct fdt_spi_driver *driver)
-{
-	int count;
-	int node_list[driver->max_ctrls];
-
-	count = fdtdec_find_aliases_for_id(gd->fdt_blob, "spi",
-					   driver->compat,
-					   node_list,
-					   driver->max_ctrls);
-	return driver->init(node_list, count);
-}
-
-void spi_init(void)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(fdt_spi_drivers); i++) {
-		driver = &fdt_spi_drivers[i];
-		if (!spi_init_driver(driver))
-			break;
-	}
-	if (i == ARRAY_SIZE(fdt_spi_drivers))
-		driver = NULL;
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
-	if (!driver)
-		return 1;
-	if (!driver->claim_bus)
-		return 0;
-
-	return driver->claim_bus(slave);
-}
-
-void spi_release_bus(struct spi_slave *slave)
-{
-	if (driver && driver->release_bus)
-		driver->release_bus(slave);
-}
-
-void spi_cs_activate(struct spi_slave *slave)
-{
-	if (driver && driver->cs_activate)
-		driver->cs_activate(slave);
-}
-
-void spi_cs_deactivate(struct spi_slave *slave)
-{
-	if (driver && driver->cs_deactivate)
-		driver->cs_deactivate(slave);
-}
-
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-	     const void *data_out, void *data_in, unsigned long flags)
-{
-	if (!driver || !driver->xfer)
-		return -1;
-
-	return driver->xfer(slave, bitlen, data_out, data_in, flags);
-}

drivers/spi/tegra114_spi.c

@@ -22,14 +22,13 @@
  */
 
 #include <common.h>
-#include <malloc.h>
+#include <dm.h>
 #include <asm/io.h>
-#include <asm/gpio.h>
 #include <asm/arch/clock.h>
 #include <asm/arch-tegra/clk_rst.h>
-#include <asm/arch-tegra114/tegra114_spi.h>
 #include <spi.h>
 #include <fdtdec.h>
+#include "tegra_spi.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -104,130 +103,63 @@ struct spi_regs {
 	u32 spare_ctl;	/* 18c:SPI_SPARE_CTRL register */
 };
 
-struct tegra_spi_ctrl {
+struct tegra114_spi_priv {
 	struct spi_regs *regs;
 	unsigned int freq;
 	unsigned int mode;
 	int periph_id;
 	int valid;
+	int last_transaction_us;
 };
 
-struct tegra_spi_slave {
-	struct spi_slave slave;
-	struct tegra_spi_ctrl *ctrl;
-};
-
-static struct tegra_spi_ctrl spi_ctrls[CONFIG_TEGRA114_SPI_CTRLS];
-
-static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave)
+static int tegra114_spi_ofdata_to_platdata(struct udevice *bus)
 {
-	return container_of(slave, struct tegra_spi_slave, slave);
-}
+	struct tegra_spi_platdata *plat = bus->platdata;
+	const void *blob = gd->fdt_blob;
+	int node = bus->of_offset;
 
-int tegra114_spi_cs_is_valid(unsigned int bus, unsigned int cs)
-{
-	if (bus >= CONFIG_TEGRA114_SPI_CTRLS || cs > 3 || !spi_ctrls[bus].valid)
-		return 0;
-	else
-		return 1;
-}
+	plat->base = fdtdec_get_addr(blob, node, "reg");
+	plat->periph_id = clock_decode_periph_id(blob, node);
 
-struct spi_slave *tegra114_spi_setup_slave(unsigned int bus, unsigned int cs,
-		unsigned int max_hz, unsigned int mode)
-{
-	struct tegra_spi_slave *spi;
-
-	debug("%s: bus: %u, cs: %u, max_hz: %u, mode: %u\n", __func__,
-		bus, cs, max_hz, mode);
-
-	if (!spi_cs_is_valid(bus, cs)) {
-		printf("SPI error: unsupported bus %d / chip select %d\n",
-		       bus, cs);
-		return NULL;
-	}
-
-	if (max_hz > TEGRA_SPI_MAX_FREQ) {
-		printf("SPI error: unsupported frequency %d Hz. Max frequency"
-			" is %d Hz\n", max_hz, TEGRA_SPI_MAX_FREQ);
-		return NULL;
+	if (plat->periph_id == PERIPH_ID_NONE) {
+		debug("%s: could not decode periph id %d\n", __func__,
+		      plat->periph_id);
+		return -FDT_ERR_NOTFOUND;
 	}
 
-	spi = spi_alloc_slave(struct tegra_spi_slave, bus, cs);
-	if (!spi) {
-		printf("SPI error: malloc of SPI structure failed\n");
-		return NULL;
-	}
-	spi->ctrl = &spi_ctrls[bus];
-	if (!spi->ctrl) {
-		printf("SPI error: could not find controller for bus %d\n",
-		       bus);
-		return NULL;
-	}
+	/* Use 500KHz as a suitable default */
+	plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
+					500000);
+	plat->deactivate_delay_us = fdtdec_get_int(blob, node,
+					"spi-deactivate-delay", 0);
+	debug("%s: base=%#08lx, periph_id=%d, max-frequency=%d, deactivate_delay=%d\n",
+	      __func__, plat->base, plat->periph_id, plat->frequency,
+	      plat->deactivate_delay_us);
 
-	if (max_hz < spi->ctrl->freq) {
-		debug("%s: limiting frequency from %u to %u\n", __func__,
-		      spi->ctrl->freq, max_hz);
-		spi->ctrl->freq = max_hz;
-	}
-	spi->ctrl->mode = mode;
-
-	return &spi->slave;
-}
-
-void tegra114_spi_free_slave(struct spi_slave *slave)
-{
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-
-	free(spi);
+	return 0;
 }
 
-int tegra114_spi_init(int *node_list, int count)
+static int tegra114_spi_probe(struct udevice *bus)
 {
-	struct tegra_spi_ctrl *ctrl;
-	int i;
-	int node = 0;
-	int found = 0;
-
-	for (i = 0; i < count; i++) {
-		ctrl = &spi_ctrls[i];
-		node = node_list[i];
-
-		ctrl->regs = (struct spi_regs *)fdtdec_get_addr(gd->fdt_blob,
-								 node, "reg");
-		if ((fdt_addr_t)ctrl->regs == FDT_ADDR_T_NONE) {
-			debug("%s: no spi register found\n", __func__);
-			continue;
-		}
-		ctrl->freq = fdtdec_get_int(gd->fdt_blob, node,
-					    "spi-max-frequency", 0);
-		if (!ctrl->freq) {
-			debug("%s: no spi max frequency found\n", __func__);
-			continue;
-		}
+	struct tegra_spi_platdata *plat = dev_get_platdata(bus);
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
 
-		ctrl->periph_id = clock_decode_periph_id(gd->fdt_blob, node);
-		if (ctrl->periph_id == PERIPH_ID_NONE) {
-			debug("%s: could not decode periph id\n", __func__);
-			continue;
-		}
-		ctrl->valid = 1;
-		found = 1;
+	priv->regs = (struct spi_regs *)plat->base;
 
-		debug("%s: found controller at %p, freq = %u, periph_id = %d\n",
-		      __func__, ctrl->regs, ctrl->freq, ctrl->periph_id);
-	}
+	priv->last_transaction_us = timer_get_us();
+	priv->freq = plat->frequency;
+	priv->periph_id = plat->periph_id;
 
-	return !found;
+	return 0;
 }
 
-int tegra114_spi_claim_bus(struct spi_slave *slave)
+static int tegra114_spi_claim_bus(struct udevice *bus)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
+	struct spi_regs *regs = priv->regs;
 
 	/* Change SPI clock to correct frequency, PLLP_OUT0 source */
-	clock_start_periph_pll(spi->ctrl->periph_id, CLOCK_ID_PERIPH,
-			       spi->ctrl->freq);
+	clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH, priv->freq);
 
 	/* Clear stale status here */
 	setbits_le32(&regs->fifo_status,
@@ -244,33 +176,64 @@ int tegra114_spi_claim_bus(struct spi_slave *slave)
 
 	/* Set master mode and sw controlled CS */
 	setbits_le32(&regs->command1, SPI_CMD1_M_S | SPI_CMD1_CS_SW_HW |
-		     (spi->ctrl->mode << SPI_CMD1_MODE_SHIFT));
+		     (priv->mode << SPI_CMD1_MODE_SHIFT));
 	debug("%s: COMMAND1 = %08x\n", __func__, readl(&regs->command1));
 
 	return 0;
 }
 
-void tegra114_spi_cs_activate(struct spi_slave *slave)
+/**
+ * Activate the CS by driving it LOW
+ *
+ * @param slave	Pointer to spi_slave to which controller has to
+ *		communicate with
+ */
+static void spi_cs_activate(struct udevice *dev)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
+
+	/* If it's too soon to do another transaction, wait */
+	if (pdata->deactivate_delay_us &&
+	    priv->last_transaction_us) {
+		ulong delay_us;		/* The delay completed so far */
+		delay_us = timer_get_us() - priv->last_transaction_us;
+		if (delay_us < pdata->deactivate_delay_us)
+			udelay(pdata->deactivate_delay_us - delay_us);
+	}
 
-	clrbits_le32(&regs->command1, SPI_CMD1_CS_SW_VAL);
+	clrbits_le32(&priv->regs->command1, SPI_CMD1_CS_SW_VAL);
 }
 
-void tegra114_spi_cs_deactivate(struct spi_slave *slave)
+/**
+ * Deactivate the CS by driving it HIGH
+ *
+ * @param slave	Pointer to spi_slave to which controller has to
+ *		communicate with
+ */
+static void spi_cs_deactivate(struct udevice *dev)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
+
+	setbits_le32(&priv->regs->command1, SPI_CMD1_CS_SW_VAL);
 
-	setbits_le32(&regs->command1, SPI_CMD1_CS_SW_VAL);
+	/* Remember time of this transaction so we can honour the bus delay */
+	if (pdata->deactivate_delay_us)
+		priv->last_transaction_us = timer_get_us();
+
+	debug("Deactivate CS, bus '%s'\n", bus->name);
 }
 
-int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-		const void *data_out, void *data_in, unsigned long flags)
+static int tegra114_spi_xfer(struct udevice *dev, unsigned int bitlen,
+			     const void *data_out, void *data_in,
+			     unsigned long flags)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
+	struct spi_regs *regs = priv->regs;
 	u32 reg, tmpdout, tmpdin = 0;
 	const u8 *dout = data_out;
 	u8 *din = data_in;
@@ -278,7 +241,7 @@ int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	int ret;
 
 	debug("%s: slave %u:%u dout %p din %p bitlen %u\n",
-	      __func__, slave->bus, slave->cs, dout, din, bitlen);
+	      __func__, bus->seq, spi_chip_select(dev), dout, din, bitlen);
 	if (bitlen % 8)
 		return -1;
 	num_bytes = bitlen / 8;
@@ -291,13 +254,13 @@ int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 
 	clrsetbits_le32(&regs->command1, SPI_CMD1_CS_SW_VAL,
 			SPI_CMD1_RX_EN | SPI_CMD1_TX_EN | SPI_CMD1_LSBY_FE |
-			(slave->cs << SPI_CMD1_CS_SEL_SHIFT));
+			(spi_chip_select(dev) << SPI_CMD1_CS_SEL_SHIFT));
 
 	/* set xfer size to 1 block (32 bits) */
 	writel(0, &regs->dma_blk);
 
 	if (flags & SPI_XFER_BEGIN)
-		spi_cs_activate(slave);
+		spi_cs_activate(dev);
 
 	/* handle data in 32-bit chunks */
 	while (num_bytes > 0) {
@@ -383,7 +346,7 @@ int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	}
 
 	if (flags & SPI_XFER_END)
-		spi_cs_deactivate(slave);
+		spi_cs_deactivate(dev);
 
 	debug("%s: transfer ended. Value=%08x, fifo_status = %08x\n",
 	      __func__, tmpdin, readl(&regs->fifo_status));
@@ -394,5 +357,56 @@ int tegra114_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 		return -1;
 	}
 
+	return ret;
+}
+
+static int tegra114_spi_set_speed(struct udevice *bus, uint speed)
+{
+	struct tegra_spi_platdata *plat = bus->platdata;
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
+
+	if (speed > plat->frequency)
+		speed = plat->frequency;
+	priv->freq = speed;
+	debug("%s: regs=%p, speed=%d\n", __func__, priv->regs, priv->freq);
+
 	return 0;
 }
+
+static int tegra114_spi_set_mode(struct udevice *bus, uint mode)
+{
+	struct tegra114_spi_priv *priv = dev_get_priv(bus);
+
+	priv->mode = mode;
+	debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);
+
+	return 0;
+}
+
+static const struct dm_spi_ops tegra114_spi_ops = {
+	.claim_bus	= tegra114_spi_claim_bus,
+	.xfer		= tegra114_spi_xfer,
+	.set_speed	= tegra114_spi_set_speed,
+	.set_mode	= tegra114_spi_set_mode,
+	/*
+	 * cs_info is not needed, since we require all chip selects to be
+	 * in the device tree explicitly
+	 */
+};
+
+static const struct udevice_id tegra114_spi_ids[] = {
+	{ .compatible = "nvidia,tegra114-spi" },
+	{ }
+};
+
+U_BOOT_DRIVER(tegra114_spi) = {
+	.name	= "tegra114_spi",
+	.id	= UCLASS_SPI,
+	.of_match = tegra114_spi_ids,
+	.ops	= &tegra114_spi_ops,
+	.ofdata_to_platdata = tegra114_spi_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct tegra_spi_platdata),
+	.priv_auto_alloc_size = sizeof(struct tegra114_spi_priv),
+	.per_child_auto_alloc_size	= sizeof(struct spi_slave),
+	.probe	= tegra114_spi_probe,
+};

drivers/spi/tegra20_sflash.c

@@ -7,15 +7,16 @@
  */
 
 #include <common.h>
-#include <malloc.h>
+#include <dm.h>
+#include <errno.h>
 #include <asm/io.h>
 #include <asm/gpio.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/pinmux.h>
 #include <asm/arch-tegra/clk_rst.h>
-#include <asm/arch-tegra20/tegra20_sflash.h>
 #include <spi.h>
 #include <fdtdec.h>
+#include "tegra_spi.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -64,129 +65,75 @@ struct spi_regs {
 	u32 rx_fifo;	/* SPI_RX_FIFO_0 register */
 };
 
-struct tegra_spi_ctrl {
+struct tegra20_sflash_priv {
 	struct spi_regs *regs;
 	unsigned int freq;
 	unsigned int mode;
 	int periph_id;
 	int valid;
+	int last_transaction_us;
 };
 
-struct tegra_spi_slave {
-	struct spi_slave slave;
-	struct tegra_spi_ctrl *ctrl;
-};
-
-/* tegra20 only supports one SFLASH controller */
-static struct tegra_spi_ctrl spi_ctrls[1];
-
-static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave)
-{
-	return container_of(slave, struct tegra_spi_slave, slave);
-}
-
-int tegra20_spi_cs_is_valid(unsigned int bus, unsigned int cs)
+int tegra20_sflash_cs_info(struct udevice *bus, unsigned int cs,
+			   struct spi_cs_info *info)
 {
 	/* Tegra20 SPI-Flash - only 1 device ('bus/cs') */
-	if (bus != 0 || cs != 0)
-		return 0;
+	if (cs != 0)
+		return -ENODEV;
 	else
-		return 1;
+		return 0;
 }
 
-struct spi_slave *tegra20_spi_setup_slave(unsigned int bus, unsigned int cs,
-				  unsigned int max_hz, unsigned int mode)
+static int tegra20_sflash_ofdata_to_platdata(struct udevice *bus)
 {
-	struct tegra_spi_slave *spi;
+	struct tegra_spi_platdata *plat = bus->platdata;
+	const void *blob = gd->fdt_blob;
+	int node = bus->of_offset;
 
-	if (!spi_cs_is_valid(bus, cs)) {
-		printf("SPI error: unsupported bus %d / chip select %d\n",
-		       bus, cs);
-		return NULL;
-	}
+	plat->base = fdtdec_get_addr(blob, node, "reg");
+	plat->periph_id = clock_decode_periph_id(blob, node);
 
-	if (max_hz > TEGRA_SPI_MAX_FREQ) {
-		printf("SPI error: unsupported frequency %d Hz. Max frequency"
-			" is %d Hz\n", max_hz, TEGRA_SPI_MAX_FREQ);
-		return NULL;
+	if (plat->periph_id == PERIPH_ID_NONE) {
+		debug("%s: could not decode periph id %d\n", __func__,
+		      plat->periph_id);
+		return -FDT_ERR_NOTFOUND;
 	}
 
-	spi = spi_alloc_slave(struct tegra_spi_slave, bus, cs);
-	if (!spi) {
-		printf("SPI error: malloc of SPI structure failed\n");
-		return NULL;
-	}
-	spi->ctrl = &spi_ctrls[bus];
-	if (!spi->ctrl) {
-		printf("SPI error: could not find controller for bus %d\n",
-		       bus);
-		return NULL;
-	}
+	/* Use 500KHz as a suitable default */
+	plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
+					500000);
+	plat->deactivate_delay_us = fdtdec_get_int(blob, node,
+					"spi-deactivate-delay", 0);
+	debug("%s: base=%#08lx, periph_id=%d, max-frequency=%d, deactivate_delay=%d\n",
+	      __func__, plat->base, plat->periph_id, plat->frequency,
+	      plat->deactivate_delay_us);
 
-	if (max_hz < spi->ctrl->freq) {
-		debug("%s: limiting frequency from %u to %u\n", __func__,
-		      spi->ctrl->freq, max_hz);
-		spi->ctrl->freq = max_hz;
-	}
-	spi->ctrl->mode = mode;
-
-	return &spi->slave;
+	return 0;
 }
 
-void tegra20_spi_free_slave(struct spi_slave *slave)
+static int tegra20_sflash_probe(struct udevice *bus)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-
-	free(spi);
-}
+	struct tegra_spi_platdata *plat = dev_get_platdata(bus);
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
 
-int tegra20_spi_init(int *node_list, int count)
-{
-	struct tegra_spi_ctrl *ctrl;
-	int i;
-	int node = 0;
-	int found = 0;
-
-	for (i = 0; i < count; i++) {
-		ctrl = &spi_ctrls[i];
-		node = node_list[i];
-
-		ctrl->regs = (struct spi_regs *)fdtdec_get_addr(gd->fdt_blob,
-								node, "reg");
-		if ((fdt_addr_t)ctrl->regs == FDT_ADDR_T_NONE) {
-			debug("%s: no slink register found\n", __func__);
-			continue;
-		}
-		ctrl->freq = fdtdec_get_int(gd->fdt_blob, node,
-					    "spi-max-frequency", 0);
-		if (!ctrl->freq) {
-			debug("%s: no slink max frequency found\n", __func__);
-			continue;
-		}
+	priv->regs = (struct spi_regs *)plat->base;
 
-		ctrl->periph_id = clock_decode_periph_id(gd->fdt_blob, node);
-		if (ctrl->periph_id == PERIPH_ID_NONE) {
-			debug("%s: could not decode periph id\n", __func__);
-			continue;
-		}
-		ctrl->valid = 1;
-		found = 1;
+	priv->last_transaction_us = timer_get_us();
+	priv->freq = plat->frequency;
+	priv->periph_id = plat->periph_id;
 
-		debug("%s: found controller at %p, freq = %u, periph_id = %d\n",
-		      __func__, ctrl->regs, ctrl->freq, ctrl->periph_id);
-	}
-	return !found;
+	return 0;
 }
 
-int tegra20_spi_claim_bus(struct spi_slave *slave)
+static int tegra20_sflash_claim_bus(struct udevice *bus)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
+	struct spi_regs *regs = priv->regs;
 	u32 reg;
 
 	/* Change SPI clock to correct frequency, PLLP_OUT0 source */
-	clock_start_periph_pll(spi->ctrl->periph_id, CLOCK_ID_PERIPH,
-			       spi->ctrl->freq);
+	clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH,
+			       priv->freq);
 
 	/* Clear stale status here */
 	reg = SPI_STAT_RDY | SPI_STAT_RXF_FLUSH | SPI_STAT_TXF_FLUSH | \
@@ -197,8 +144,8 @@ int tegra20_spi_claim_bus(struct spi_slave *slave)
 	/*
 	 * Use sw-controlled CS, so we can clock in data after ReadID, etc.
 	 */
-	reg = (spi->ctrl->mode & 1) << SPI_CMD_ACTIVE_SDA_SHIFT;
-	if (spi->ctrl->mode & 2)
+	reg = (priv->mode & 1) << SPI_CMD_ACTIVE_SDA_SHIFT;
+	if (priv->mode & 2)
 		reg |= 1 << SPI_CMD_ACTIVE_SCLK_SHIFT;
 	clrsetbits_le32(&regs->command, SPI_CMD_ACTIVE_SCLK_MASK |
 		SPI_CMD_ACTIVE_SDA_MASK, SPI_CMD_CS_SOFT | reg);
@@ -215,37 +162,54 @@ int tegra20_spi_claim_bus(struct spi_slave *slave)
 	return 0;
 }
 
-void tegra20_spi_cs_activate(struct spi_slave *slave)
+static void spi_cs_activate(struct udevice *dev)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
+
+	/* If it's too soon to do another transaction, wait */
+	if (pdata->deactivate_delay_us &&
+	    priv->last_transaction_us) {
+		ulong delay_us;		/* The delay completed so far */
+		delay_us = timer_get_us() - priv->last_transaction_us;
+		if (delay_us < pdata->deactivate_delay_us)
+			udelay(pdata->deactivate_delay_us - delay_us);
+	}
 
 	/* CS is negated on Tegra, so drive a 1 to get a 0 */
-	setbits_le32(&regs->command, SPI_CMD_CS_VAL);
+	setbits_le32(&priv->regs->command, SPI_CMD_CS_VAL);
 }
 
-void tegra20_spi_cs_deactivate(struct spi_slave *slave)
+static void spi_cs_deactivate(struct udevice *dev)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
 
 	/* CS is negated on Tegra, so drive a 0 to get a 1 */
-	clrbits_le32(&regs->command, SPI_CMD_CS_VAL);
+	clrbits_le32(&priv->regs->command, SPI_CMD_CS_VAL);
+
+	/* Remember time of this transaction so we can honour the bus delay */
+	if (pdata->deactivate_delay_us)
+		priv->last_transaction_us = timer_get_us();
 }
 
-int tegra20_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-		const void *data_out, void *data_in, unsigned long flags)
+static int tegra20_sflash_xfer(struct udevice *dev, unsigned int bitlen,
+			     const void *data_out, void *data_in,
+			     unsigned long flags)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
+	struct spi_regs *regs = priv->regs;
 	u32 reg, tmpdout, tmpdin = 0;
 	const u8 *dout = data_out;
 	u8 *din = data_in;
 	int num_bytes;
 	int ret;
 
-	debug("spi_xfer: slave %u:%u dout %08X din %08X bitlen %u\n",
-	      slave->bus, slave->cs, *(u8 *)dout, *(u8 *)din, bitlen);
+	debug("%s: slave %u:%u dout %p din %p bitlen %u\n",
+	      __func__, bus->seq, spi_chip_select(dev), dout, din, bitlen);
 	if (bitlen % 8)
 		return -1;
 	num_bytes = bitlen / 8;
@@ -262,7 +226,7 @@ int tegra20_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	debug("spi_xfer: COMMAND = %08x\n", readl(&regs->command));
 
 	if (flags & SPI_XFER_BEGIN)
-		spi_cs_activate(slave);
+		spi_cs_activate(dev);
 
 	/* handle data in 32-bit chunks */
 	while (num_bytes > 0) {
@@ -327,7 +291,7 @@ int tegra20_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	}
 
 	if (flags & SPI_XFER_END)
-		spi_cs_deactivate(slave);
+		spi_cs_deactivate(dev);
 
 	debug("spi_xfer: transfer ended. Value=%08x, status = %08x\n",
 		tmpdin, readl(&regs->status));
@@ -339,3 +303,51 @@ int tegra20_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 
 	return 0;
 }
+
+static int tegra20_sflash_set_speed(struct udevice *bus, uint speed)
+{
+	struct tegra_spi_platdata *plat = bus->platdata;
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
+
+	if (speed > plat->frequency)
+		speed = plat->frequency;
+	priv->freq = speed;
+	debug("%s: regs=%p, speed=%d\n", __func__, priv->regs, priv->freq);
+
+	return 0;
+}
+
+static int tegra20_sflash_set_mode(struct udevice *bus, uint mode)
+{
+	struct tegra20_sflash_priv *priv = dev_get_priv(bus);
+
+	priv->mode = mode;
+	debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);
+
+	return 0;
+}
+
+static const struct dm_spi_ops tegra20_sflash_ops = {
+	.claim_bus	= tegra20_sflash_claim_bus,
+	.xfer		= tegra20_sflash_xfer,
+	.set_speed	= tegra20_sflash_set_speed,
+	.set_mode	= tegra20_sflash_set_mode,
+	.cs_info	= tegra20_sflash_cs_info,
+};
+
+static const struct udevice_id tegra20_sflash_ids[] = {
+	{ .compatible = "nvidia,tegra20-sflash" },
+	{ }
+};
+
+U_BOOT_DRIVER(tegra20_sflash) = {
+	.name	= "tegra20_sflash",
+	.id	= UCLASS_SPI,
+	.of_match = tegra20_sflash_ids,
+	.ops	= &tegra20_sflash_ops,
+	.ofdata_to_platdata = tegra20_sflash_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct tegra_spi_platdata),
+	.priv_auto_alloc_size = sizeof(struct tegra20_sflash_priv),
+	.per_child_auto_alloc_size	= sizeof(struct spi_slave),
+	.probe	= tegra20_sflash_probe,
+};

drivers/spi/tegra20_slink.c

@@ -22,14 +22,13 @@
  */
 
 #include <common.h>
-#include <malloc.h>
+#include <dm.h>
 #include <asm/io.h>
-#include <asm/gpio.h>
 #include <asm/arch/clock.h>
 #include <asm/arch-tegra/clk_rst.h>
-#include <asm/arch-tegra20/tegra20_slink.h>
 #include <spi.h>
 #include <fdtdec.h>
+#include "tegra_spi.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -87,130 +86,70 @@ struct spi_regs {
 	u32 rx_fifo;	/* SLINK_RX_FIFO_0 reg off 180h */
 };
 
-struct tegra_spi_ctrl {
+struct tegra30_spi_priv {
 	struct spi_regs *regs;
 	unsigned int freq;
 	unsigned int mode;
 	int periph_id;
 	int valid;
+	int last_transaction_us;
 };
 
 struct tegra_spi_slave {
 	struct spi_slave slave;
-	struct tegra_spi_ctrl *ctrl;
+	struct tegra30_spi_priv *ctrl;
 };
 
-static struct tegra_spi_ctrl spi_ctrls[CONFIG_TEGRA_SLINK_CTRLS];
-
-static inline struct tegra_spi_slave *to_tegra_spi(struct spi_slave *slave)
-{
-	return container_of(slave, struct tegra_spi_slave, slave);
-}
-
-int tegra30_spi_cs_is_valid(unsigned int bus, unsigned int cs)
+static int tegra30_spi_ofdata_to_platdata(struct udevice *bus)
 {
-	if (bus >= CONFIG_TEGRA_SLINK_CTRLS || cs > 3 || !spi_ctrls[bus].valid)
-		return 0;
-	else
-		return 1;
-}
+	struct tegra_spi_platdata *plat = bus->platdata;
+	const void *blob = gd->fdt_blob;
+	int node = bus->of_offset;
 
-struct spi_slave *tegra30_spi_setup_slave(unsigned int bus, unsigned int cs,
-		unsigned int max_hz, unsigned int mode)
-{
-	struct tegra_spi_slave *spi;
+	plat->base = fdtdec_get_addr(blob, node, "reg");
+	plat->periph_id = clock_decode_periph_id(blob, node);
 
-	debug("%s: bus: %u, cs: %u, max_hz: %u, mode: %u\n", __func__,
-		bus, cs, max_hz, mode);
-
-	if (!spi_cs_is_valid(bus, cs)) {
-		printf("SPI error: unsupported bus %d / chip select %d\n",
-		       bus, cs);
-		return NULL;
-	}
-
-	if (max_hz > TEGRA_SPI_MAX_FREQ) {
-		printf("SPI error: unsupported frequency %d Hz. Max frequency"
-			" is %d Hz\n", max_hz, TEGRA_SPI_MAX_FREQ);
-		return NULL;
+	if (plat->periph_id == PERIPH_ID_NONE) {
+		debug("%s: could not decode periph id %d\n", __func__,
+		      plat->periph_id);
+		return -FDT_ERR_NOTFOUND;
 	}
 
-	spi = spi_alloc_slave(struct tegra_spi_slave, bus, cs);
-	if (!spi) {
-		printf("SPI error: malloc of SPI structure failed\n");
-		return NULL;
-	}
-	spi->ctrl = &spi_ctrls[bus];
-	if (!spi->ctrl) {
-		printf("SPI error: could not find controller for bus %d\n",
-		       bus);
-		return NULL;
-	}
+	/* Use 500KHz as a suitable default */
+	plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
+					500000);
+	plat->deactivate_delay_us = fdtdec_get_int(blob, node,
+					"spi-deactivate-delay", 0);
+	debug("%s: base=%#08lx, periph_id=%d, max-frequency=%d, deactivate_delay=%d\n",
+	      __func__, plat->base, plat->periph_id, plat->frequency,
+	      plat->deactivate_delay_us);
 
-	if (max_hz < spi->ctrl->freq) {
-		debug("%s: limiting frequency from %u to %u\n", __func__,
-		      spi->ctrl->freq, max_hz);
-		spi->ctrl->freq = max_hz;
-	}
-	spi->ctrl->mode = mode;
-
-	return &spi->slave;
+	return 0;
 }
 
-void tegra30_spi_free_slave(struct spi_slave *slave)
+static int tegra30_spi_probe(struct udevice *bus)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-
-	free(spi);
-}
+	struct tegra_spi_platdata *plat = dev_get_platdata(bus);
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
 
-int tegra30_spi_init(int *node_list, int count)
-{
-	struct tegra_spi_ctrl *ctrl;
-	int i;
-	int node = 0;
-	int found = 0;
-
-	for (i = 0; i < count; i++) {
-		ctrl = &spi_ctrls[i];
-		node = node_list[i];
-
-		ctrl->regs = (struct spi_regs *)fdtdec_get_addr(gd->fdt_blob,
-								node, "reg");
-		if ((fdt_addr_t)ctrl->regs == FDT_ADDR_T_NONE) {
-			debug("%s: no slink register found\n", __func__);
-			continue;
-		}
-		ctrl->freq = fdtdec_get_int(gd->fdt_blob, node,
-					    "spi-max-frequency", 0);
-		if (!ctrl->freq) {
-			debug("%s: no slink max frequency found\n", __func__);
-			continue;
-		}
+	priv->regs = (struct spi_regs *)plat->base;
 
-		ctrl->periph_id = clock_decode_periph_id(gd->fdt_blob, node);
-		if (ctrl->periph_id == PERIPH_ID_NONE) {
-			debug("%s: could not decode periph id\n", __func__);
-			continue;
-		}
-		ctrl->valid = 1;
-		found = 1;
+	priv->last_transaction_us = timer_get_us();
+	priv->freq = plat->frequency;
+	priv->periph_id = plat->periph_id;
 
-		debug("%s: found controller at %p, freq = %u, periph_id = %d\n",
-		      __func__, ctrl->regs, ctrl->freq, ctrl->periph_id);
-	}
-	return !found;
+	return 0;
 }
 
-int tegra30_spi_claim_bus(struct spi_slave *slave)
+static int tegra30_spi_claim_bus(struct udevice *bus)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
+	struct spi_regs *regs = priv->regs;
 	u32 reg;
 
 	/* Change SPI clock to correct frequency, PLLP_OUT0 source */
-	clock_start_periph_pll(spi->ctrl->periph_id, CLOCK_ID_PERIPH,
-			       spi->ctrl->freq);
+	clock_start_periph_pll(priv->periph_id, CLOCK_ID_PERIPH,
+			       priv->freq);
 
 	/* Clear stale status here */
 	reg = SLINK_STAT_RDY | SLINK_STAT_RXF_FLUSH | SLINK_STAT_TXF_FLUSH | \
@@ -227,29 +166,46 @@ int tegra30_spi_claim_bus(struct spi_slave *slave)
 	return 0;
 }
 
-void tegra30_spi_cs_activate(struct spi_slave *slave)
+static void spi_cs_activate(struct udevice *dev)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
+
+	/* If it's too soon to do another transaction, wait */
+	if (pdata->deactivate_delay_us &&
+	    priv->last_transaction_us) {
+		ulong delay_us;		/* The delay completed so far */
+		delay_us = timer_get_us() - priv->last_transaction_us;
+		if (delay_us < pdata->deactivate_delay_us)
+			udelay(pdata->deactivate_delay_us - delay_us);
+	}
 
 	/* CS is negated on Tegra, so drive a 1 to get a 0 */
-	setbits_le32(&regs->command, SLINK_CMD_CS_VAL);
+	setbits_le32(&priv->regs->command, SLINK_CMD_CS_VAL);
 }
 
-void tegra30_spi_cs_deactivate(struct spi_slave *slave)
+static void spi_cs_deactivate(struct udevice *dev)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra_spi_platdata *pdata = dev_get_platdata(bus);
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
 
 	/* CS is negated on Tegra, so drive a 0 to get a 1 */
-	clrbits_le32(&regs->command, SLINK_CMD_CS_VAL);
+	clrbits_le32(&priv->regs->command, SLINK_CMD_CS_VAL);
+
+	/* Remember time of this transaction so we can honour the bus delay */
+	if (pdata->deactivate_delay_us)
+		priv->last_transaction_us = timer_get_us();
 }
 
-int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
-		const void *data_out, void *data_in, unsigned long flags)
+static int tegra30_spi_xfer(struct udevice *dev, unsigned int bitlen,
+			    const void *data_out, void *data_in,
+			    unsigned long flags)
 {
-	struct tegra_spi_slave *spi = to_tegra_spi(slave);
-	struct spi_regs *regs = spi->ctrl->regs;
+	struct udevice *bus = dev->parent;
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
+	struct spi_regs *regs = priv->regs;
 	u32 reg, tmpdout, tmpdin = 0;
 	const u8 *dout = data_out;
 	u8 *din = data_in;
@@ -257,7 +213,7 @@ int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	int ret;
 
 	debug("%s: slave %u:%u dout %p din %p bitlen %u\n",
-	      __func__, slave->bus, slave->cs, dout, din, bitlen);
+	      __func__, bus->seq, spi_chip_select(dev), dout, din, bitlen);
 	if (bitlen % 8)
 		return -1;
 	num_bytes = bitlen / 8;
@@ -276,11 +232,11 @@ int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 
 	clrsetbits_le32(&regs->command2, SLINK_CMD2_SS_EN_MASK,
 			SLINK_CMD2_TXEN | SLINK_CMD2_RXEN |
-			(slave->cs << SLINK_CMD2_SS_EN_SHIFT));
+			(spi_chip_select(dev) << SLINK_CMD2_SS_EN_SHIFT));
 	debug("%s entry: COMMAND2 = %08x\n", __func__, readl(&regs->command2));
 
 	if (flags & SPI_XFER_BEGIN)
-		spi_cs_activate(slave);
+		spi_cs_activate(dev);
 
 	/* handle data in 32-bit chunks */
 	while (num_bytes > 0) {
@@ -344,7 +300,7 @@ int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 	}
 
 	if (flags & SPI_XFER_END)
-		spi_cs_deactivate(slave);
+		spi_cs_deactivate(dev);
 
 	debug("%s: transfer ended. Value=%08x, status = %08x\n",
 	      __func__, tmpdin, readl(&regs->status));
@@ -357,3 +313,54 @@ int tegra30_spi_xfer(struct spi_slave *slave, unsigned int bitlen,
 
 	return 0;
 }
+
+static int tegra30_spi_set_speed(struct udevice *bus, uint speed)
+{
+	struct tegra_spi_platdata *plat = bus->platdata;
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
+
+	if (speed > plat->frequency)
+		speed = plat->frequency;
+	priv->freq = speed;
+	debug("%s: regs=%p, speed=%d\n", __func__, priv->regs, priv->freq);
+
+	return 0;
+}
+
+static int tegra30_spi_set_mode(struct udevice *bus, uint mode)
+{
+	struct tegra30_spi_priv *priv = dev_get_priv(bus);
+
+	priv->mode = mode;
+	debug("%s: regs=%p, mode=%d\n", __func__, priv->regs, priv->mode);
+
+	return 0;
+}
+
+static const struct dm_spi_ops tegra30_spi_ops = {
+	.claim_bus	= tegra30_spi_claim_bus,
+	.xfer		= tegra30_spi_xfer,
+	.set_speed	= tegra30_spi_set_speed,
+	.set_mode	= tegra30_spi_set_mode,
+	/*
+	 * cs_info is not needed, since we require all chip selects to be
+	 * in the device tree explicitly
+	 */
+};
+
+static const struct udevice_id tegra30_spi_ids[] = {
+	{ .compatible = "nvidia,tegra20-slink" },
+	{ }
+};
+
+U_BOOT_DRIVER(tegra30_spi) = {
+	.name	= "tegra20_slink",
+	.id	= UCLASS_SPI,
+	.of_match = tegra30_spi_ids,
+	.ops	= &tegra30_spi_ops,
+	.ofdata_to_platdata = tegra30_spi_ofdata_to_platdata,
+	.platdata_auto_alloc_size = sizeof(struct tegra_spi_platdata),
+	.priv_auto_alloc_size = sizeof(struct tegra30_spi_priv),
+	.per_child_auto_alloc_size	= sizeof(struct spi_slave),
+	.probe	= tegra30_spi_probe,
+};

drivers/spi/tegra_spi.h

+/*
+ * (C) Copyright 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+struct tegra_spi_platdata {
+	enum periph_id periph_id;
+	int frequency;		/* Default clock frequency, -1 for none */
+	ulong base;
+	uint deactivate_delay_us;	/* Delay to wait after deactivate */
+};

include/configs/tegra-common-post.h

@@ -59,7 +59,7 @@
 	BOARD_EXTRA_ENV_SETTINGS
 
 #if defined(CONFIG_TEGRA20_SFLASH) || defined(CONFIG_TEGRA20_SLINK) || defined(CONFIG_TEGRA114_SPI)
-#define CONFIG_FDT_SPI
+#define CONFIG_TEGRA_SPI
 #endif
 
 /* overrides for SPL build here */

include/configs/tegra-common.h

@@ -24,6 +24,8 @@
 #ifndef CONFIG_SPL_BUILD
 #define CONFIG_DM_SERIAL
 #endif
+#define CONFIG_DM_SPI
+#define CONFIG_DM_SPI_FLASH
 
 #define CONFIG_SYS_TIMER_RATE		1000000
 #define CONFIG_SYS_TIMER_COUNTER	NV_PA_TMRUS_BASE