ns16550: unify serial_x86

Unify serial_x86, and use the generic binding.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

arch/x86/dts/serial.dtsi

 / {
 	serial: serial {
-		compatible = "x86-uart";
+		compatible = "ns16550";
 		reg = <0x3f8 8>;
 		reg-shift = <0>;
 		clock-frequency = <1843200>;

configs/efi-x86_defconfig

@@ -3,6 +3,7 @@ CONFIG_VENDOR_EFI=y
 CONFIG_DEFAULT_DEVICE_TREE="efi"
 CONFIG_TARGET_EFI=y
 CONFIG_TSC_CALIBRATION_BYPASS=y
+# CONFIG_NS16550_SERIAL is not set
 # CONFIG_CMD_BOOTM is not set
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_NET is not set
@@ -13,5 +14,4 @@ CONFIG_DEBUG_UART=y
 CONFIG_DEBUG_EFI_CONSOLE=y
 CONFIG_DEBUG_UART_BASE=0
 CONFIG_DEBUG_UART_CLOCK=0
-# CONFIG_X86_SERIAL is not set
 CONFIG_EFI=y

drivers/serial/Kconfig

@@ -198,6 +198,7 @@ config ROCKCHIP_SERIAL
 config NS16550_SERIAL
 	bool "NS16550 UART or compatible"
 	depends on DM_SERIAL
+	default y if X86
 	help
 	  Support NS16550 UART or compatible with driver model. This can be
 	  enabled in the device tree with the correct input clock frequency.
@@ -233,14 +234,4 @@ config UNIPHIER_SERIAL
 	  If you have a UniPhier based board and want to use the on-chip
 	  serial ports, say Y to this option. If unsure, say N.
 
-config X86_SERIAL
-	bool "Support for 16550 serial port on x86 machines"
-	depends on X86
-	default y
-	help
-	  Most x86 machines have a ns16550 UART or compatible. This can be
-	  enabled in the device tree with the correct input clock frequency
-	  provided (default 1843200). Enable this to obtain serial console
-	  output.
-
 endmenu

drivers/serial/Makefile

@@ -46,7 +46,6 @@ obj-$(CONFIG_ARC_SERIAL) += serial_arc.o
 obj-$(CONFIG_TEGRA_SERIAL) += serial_tegra.o
 obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o
 obj-$(CONFIG_OMAP_SERIAL) += serial_omap.o
-obj-$(CONFIG_X86_SERIAL) += serial_x86.o
 obj-$(CONFIG_STM32_SERIAL) += serial_stm32.o
 
 ifndef CONFIG_SPL_BUILD

drivers/serial/serial_x86.c

-/*
- * Copyright (c) 2014 Google, Inc
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-#include <dm.h>
-#include <fdtdec.h>
-#include <ns16550.h>
-#include <serial.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-static const struct udevice_id x86_serial_ids[] = {
-	{ .compatible = "x86-uart" },
-	{ }
-};
-
-static int x86_serial_ofdata_to_platdata(struct udevice *dev)
-{
-	struct ns16550_platdata *plat = dev_get_platdata(dev);
-	int ret;
-
-	ret = ns16550_serial_ofdata_to_platdata(dev);
-	if (ret)
-		return ret;
-
-	plat->clock = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
-				     "clock-frequency", 1843200);
-
-	return 0;
-}
-
-U_BOOT_DRIVER(serial_ns16550) = {
-	.name	= "serial_x86",
-	.id	= UCLASS_SERIAL,
-	.of_match = x86_serial_ids,
-	.ofdata_to_platdata = x86_serial_ofdata_to_platdata,
-	.platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
-	.priv_auto_alloc_size = sizeof(struct NS16550),
-	.probe = ns16550_serial_probe,
-	.ops	= &ns16550_serial_ops,
-};