spi: spi-mpc52xx: switch to using gpiod API

This switches the driver to use gpiod API instead of legacy gpio API,
which will brings us close to removing of_get_gpio() and other
OF-specific old APIs.

No functional change intended beyond some differences in error messages.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/Yy07WbMAG4bPgYNd@google.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-mpc52xx.c

@@ -11,6 +11,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/of_platform.h>
 #include <linux/interrupt.h>
@@ -18,7 +19,6 @@
 #include <linux/gpio/consumer.h>
 #include <linux/spi/spi.h>
 #include <linux/io.h>
-#include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -90,7 +90,7 @@ struct mpc52xx_spi {
 	const u8 *tx_buf;
 	int cs_change;
 	int gpio_cs_count;
-	unsigned int *gpio_cs;
+	struct gpio_desc **gpio_cs;
 };
 
 /*
@@ -102,9 +102,10 @@ static void mpc52xx_spi_chipsel(struct mpc52xx_spi *ms, int value)
 
 	if (ms->gpio_cs_count > 0) {
 		cs = ms->message->spi->chip_select;
-		gpio_set_value(ms->gpio_cs[cs], value ? 0 : 1);
-	} else
+		gpiod_set_value(ms->gpio_cs[cs], value);
+	} else {
 		out_8(ms->regs + SPI_PORTDATA, value ? 0 : 0x08);
+	}
 }
 
 /*
@@ -386,10 +387,10 @@ static int mpc52xx_spi_probe(struct platform_device *op)
 {
 	struct spi_master *master;
 	struct mpc52xx_spi *ms;
+	struct gpio_desc *gpio_cs;
 	void __iomem *regs;
 	u8 ctrl1;
 	int rc, i = 0;
-	int gpio_cs;
 
 	/* MMIO registers */
 	dev_dbg(&op->dev, "probing mpc5200 SPI device\n");
@@ -451,23 +452,16 @@ static int mpc52xx_spi_probe(struct platform_device *op)
 		}
 
 		for (i = 0; i < ms->gpio_cs_count; i++) {
-			gpio_cs = of_get_gpio(op->dev.of_node, i);
-			if (!gpio_is_valid(gpio_cs)) {
-				dev_err(&op->dev,
-					"could not parse the gpio field in oftree\n");
-				rc = -ENODEV;
-				goto err_gpio;
-			}
-
-			rc = gpio_request(gpio_cs, dev_name(&op->dev));
+			gpio_cs = gpiod_get_index(&op->dev,
+						  NULL, i, GPIOD_OUT_LOW);
+			rc = PTR_ERR_OR_ZERO(gpio_cs);
 			if (rc) {
 				dev_err(&op->dev,
-					"can't request spi cs gpio #%d on gpio line %d\n",
-					i, gpio_cs);
+					"failed to get spi cs gpio #%d: %d\n",
+					i, rc);
 				goto err_gpio;
 			}
 
-			gpio_direction_output(gpio_cs, 1);
 			ms->gpio_cs[i] = gpio_cs;
 		}
 	}
@@ -508,7 +502,7 @@ static int mpc52xx_spi_probe(struct platform_device *op)
 	dev_err(&ms->master->dev, "initialization failed\n");
  err_gpio:
 	while (i-- > 0)
-		gpio_free(ms->gpio_cs[i]);
+		gpiod_put(ms->gpio_cs[i]);
 
 	kfree(ms->gpio_cs);
  err_alloc_gpio:
@@ -529,7 +523,7 @@ static int mpc52xx_spi_remove(struct platform_device *op)
 	free_irq(ms->irq1, ms);
 
 	for (i = 0; i < ms->gpio_cs_count; i++)
-		gpio_free(ms->gpio_cs[i]);
+		gpiod_put(ms->gpio_cs[i]);
 
 	kfree(ms->gpio_cs);
 	spi_unregister_master(master);