dm: gpio: Convert stm32f7 driver to livetree

Update the GPIO driver to support a live device tree.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

drivers/gpio/stm32f7_gpio.c

@@ -16,14 +16,11 @@
 #include <linux/errno.h>
 #include <linux/io.h>
 
-#define MAX_SIZE_BANK_NAME		5
 #define STM32_GPIOS_PER_BANK		16
 #define MODE_BITS(gpio_pin)		(gpio_pin * 2)
 #define MODE_BITS_MASK			3
 #define IN_OUT_BIT_INDEX(gpio_pin)	(1UL << (gpio_pin))
 
-DECLARE_GLOBAL_DATA_PTR;
-
 static int stm32_gpio_direction_input(struct udevice *dev, unsigned offset)
 {
 	struct stm32_gpio_priv *priv = dev_get_priv(dev);
@@ -82,17 +79,14 @@ static int gpio_stm32_probe(struct udevice *dev)
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct stm32_gpio_priv *priv = dev_get_priv(dev);
 	fdt_addr_t addr;
-	char *name;
+	const char *name;
 
-	addr = devfdt_get_addr(dev);
+	addr = dev_read_addr(dev);
 	if (addr == FDT_ADDR_T_NONE)
 		return -EINVAL;
 
 	priv->regs = (struct stm32_gpio_regs *)addr;
-	name = (char *)fdtdec_locate_byte_array(gd->fdt_blob,
-						dev_of_offset(dev),
-						"st,bank-name",
-						MAX_SIZE_BANK_NAME);
+	name = dev_read_string(dev, "st,bank-name");
 	if (!name)
 		return -EINVAL;
 	uc_priv->bank_name = name;