mtd: rawnand: lpc32xx_mlc: switch to using gpiod API

This switches the driver from legacy gpio API to a newer gpiod API.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220928230019.2140896-1-dmitry.torokhov@gmail.com

drivers/mtd/nand/raw/lpc32xx_mlc.c

@@ -25,7 +25,7 @@
 #include <linux/completion.h>
 #include <linux/interrupt.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/mtd/lpc32xx_mlc.h>
 #include <linux/io.h>
 #include <linux/mm.h>
@@ -122,7 +122,6 @@ struct lpc32xx_nand_cfg_mlc {
 	uint32_t rd_low;
 	uint32_t wr_high;
 	uint32_t wr_low;
-	int wp_gpio;
 	struct mtd_partition *parts;
 	unsigned num_parts;
 };
@@ -177,6 +176,7 @@ struct lpc32xx_nand_host {
 	struct nand_chip	nand_chip;
 	struct lpc32xx_mlc_platform_data *pdata;
 	struct clk		*clk;
+	struct gpio_desc	*wp_gpio;
 	void __iomem		*io_base;
 	int			irq;
 	struct lpc32xx_nand_cfg_mlc	*ncfg;
@@ -370,8 +370,8 @@ static int lpc32xx_waitfunc(struct nand_chip *chip)
  */
 static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
 {
-	if (gpio_is_valid(host->ncfg->wp_gpio))
-		gpio_set_value(host->ncfg->wp_gpio, 0);
+	if (host->wp_gpio)
+		gpiod_set_value_cansleep(host->wp_gpio, 1);
 }
 
 /*
@@ -379,8 +379,8 @@ static void lpc32xx_wp_enable(struct lpc32xx_nand_host *host)
  */
 static void lpc32xx_wp_disable(struct lpc32xx_nand_host *host)
 {
-	if (gpio_is_valid(host->ncfg->wp_gpio))
-		gpio_set_value(host->ncfg->wp_gpio, 1);
+	if (host->wp_gpio)
+		gpiod_set_value_cansleep(host->wp_gpio, 0);
 }
 
 static void lpc32xx_dma_complete_func(void *completion)
@@ -636,8 +636,6 @@ static struct lpc32xx_nand_cfg_mlc *lpc32xx_parse_dt(struct device *dev)
 		return NULL;
 	}
 
-	ncfg->wp_gpio = of_get_named_gpio(np, "gpios", 0);
-
 	return ncfg;
 }
 
@@ -713,14 +711,18 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 			"Missing or bad NAND config from device tree\n");
 		return -ENOENT;
 	}
-	if (host->ncfg->wp_gpio == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-	if (gpio_is_valid(host->ncfg->wp_gpio) &&
-			gpio_request(host->ncfg->wp_gpio, "NAND WP")) {
-		dev_err(&pdev->dev, "GPIO not available\n");
-		return -EBUSY;
+
+	/* Start with WP disabled, if available */
+	host->wp_gpio = gpiod_get_optional(&pdev->dev, NULL, GPIOD_OUT_LOW);
+	res = PTR_ERR_OR_ZERO(host->wp_gpio);
+	if (res) {
+		if (res != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "WP GPIO is not available: %d\n",
+				res);
+		return res;
 	}
-	lpc32xx_wp_disable(host);
+
+	gpiod_set_consumer_name(host->wp_gpio, "NAND WP");
 
 	host->pdata = dev_get_platdata(&pdev->dev);
 
@@ -817,7 +819,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	clk_put(host->clk);
 free_gpio:
 	lpc32xx_wp_enable(host);
-	gpio_free(host->ncfg->wp_gpio);
+	gpiod_put(host->wp_gpio);
 
 	return res;
 }
@@ -843,7 +845,7 @@ static int lpc32xx_nand_remove(struct platform_device *pdev)
 	clk_put(host->clk);
 
 	lpc32xx_wp_enable(host);
-	gpio_free(host->ncfg->wp_gpio);
+	gpiod_put(host->wp_gpio);
 
 	return 0;
 }