eeprom: digsy_mtc: Convert to use GPIO descriptors

This converts the driver to use GPIO descriptors exclusively
to retrieve GPIO lines. Drop the old GPIO handling in favor of
the core managing it exclusively.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240508184905.2102633-4-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/eeprom/digsy_mtc_eeprom.c

@@ -14,13 +14,12 @@
  * and delete this driver.
  */
 
-#include <linux/gpio.h>
 #include <linux/gpio/machine.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/spi_gpio.h>
-#include <linux/eeprom_93xx46.h>
 
 #define GPIO_EEPROM_CLK		216
 #define GPIO_EEPROM_CS		210
@@ -29,22 +28,13 @@
 #define GPIO_EEPROM_OE		255
 #define EE_SPI_BUS_NUM	1
 
-static void digsy_mtc_op_prepare(void *p)
-{
-	/* enable */
-	gpio_set_value(GPIO_EEPROM_OE, 0);
-}
-
-static void digsy_mtc_op_finish(void *p)
-{
-	/* disable */
-	gpio_set_value(GPIO_EEPROM_OE, 1);
-}
+static const struct property_entry digsy_mtc_spi_properties[] = {
+	PROPERTY_ENTRY_U32("data-size", 8),
+	{ }
+};
 
-struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = {
-	.flags		= EE_ADDR8 | EE_SIZE1K,
-	.prepare	= digsy_mtc_op_prepare,
-	.finish		= digsy_mtc_op_finish,
+static const struct software_node digsy_mtc_spi_node = {
+	.properties = digsy_mtc_spi_properties,
 };
 
 static struct spi_gpio_platform_data eeprom_spi_gpio_data = {
@@ -70,18 +60,19 @@ static struct gpiod_lookup_table eeprom_spi_gpiod_table = {
 			    "miso", GPIO_ACTIVE_HIGH),
 		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_CS,
 			    "cs", GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP("gpio@b00", GPIO_EEPROM_OE,
+			    "select", GPIO_ACTIVE_LOW),
 		{ },
 	},
 };
 
 static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
 	{
-		.modalias		= "93xx46",
+		.modalias		= "eeprom-93xx46",
 		.max_speed_hz		= 1000000,
 		.bus_num		= EE_SPI_BUS_NUM,
 		.chip_select		= 0,
 		.mode			= SPI_MODE_0,
-		.platform_data		= &digsy_mtc_eeprom_data,
 	},
 };
 
@@ -89,15 +80,18 @@ static int __init digsy_mtc_eeprom_devices_init(void)
 {
 	int ret;
 
-	ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH,
-				"93xx46 EEPROMs OE");
-	if (ret) {
-		pr_err("can't request gpio %d\n", GPIO_EEPROM_OE);
-		return ret;
-	}
 	gpiod_add_lookup_table(&eeprom_spi_gpiod_table);
 	spi_register_board_info(digsy_mtc_eeprom_info,
 				ARRAY_SIZE(digsy_mtc_eeprom_info));
-	return platform_device_register(&digsy_mtc_eeprom);
+
+	ret = device_add_software_node(&digsy_mtc_eeprom.dev, &digsy_mtc_spi_node);
+	if (ret)
+		return ret;
+
+	ret = platform_device_register(&digsy_mtc_eeprom);
+	if (ret)
+		device_remove_software_node(&digsy_mtc_eeprom.dev);
+
+	return ret;
 }
 device_initcall(digsy_mtc_eeprom_devices_init);