linux-kernel - [PATCH 3/3] net: phy: spi_ks8895: switch to using gpiod API

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Date:   Tue,  6 Sep 2022 13:49:22 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] net: phy: spi_ks8895: switch to using gpiod API

This patch switches the driver away from legacy gpio/of_gpio API to
gpiod API, and removes use of of_get_named_gpio_flags() which I want to
make private to gpiolib.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/net/phy/spi_ks8995.c | 69 ++++++++----------------------------
 1 file changed, 14 insertions(+), 55 deletions(-)

diff --git a/drivers/net/phy/spi_ks8995.c b/drivers/net/phy/spi_ks8995.c
index ff37f8ba6758..d4202d40d47a 100644
--- a/drivers/net/phy/spi_ks8995.c
+++ b/drivers/net/phy/spi_ks8995.c
@@ -17,7 +17,6 @@
 #include <linux/device.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 
 #include <linux/spi/spi.h>
 
@@ -137,15 +136,10 @@ static const struct ks8995_chip_params ks8995_chip[] = {
 	},
 };
 
-struct ks8995_pdata {
-	int reset_gpio;
-	enum of_gpio_flags reset_gpio_flags;
-};
-
 struct ks8995_switch {
 	struct spi_device	*spi;
 	struct mutex		lock;
-	struct ks8995_pdata	*pdata;
+	struct gpio_desc	*reset_gpio;
 	struct bin_attribute	regs_attr;
 	const struct ks8995_chip_params	*chip;
 	int			revision_id;
@@ -401,24 +395,6 @@ static int ks8995_get_revision(struct ks8995_switch *ks)
 	return err;
 }
 
-/* ks8995_parse_dt - setup platform data from devicetree
- * @ks: pointer to switch instance
- *
- * Parses supported DT properties and sets up platform data
- * accordingly.
- */
-static void ks8995_parse_dt(struct ks8995_switch *ks)
-{
-	struct device_node *np = ks->spi->dev.of_node;
-	struct ks8995_pdata *pdata = ks->pdata;
-
-	if (!np)
-		return;
-
-	pdata->reset_gpio = of_get_named_gpio_flags(np, "reset-gpios", 0,
-		&pdata->reset_gpio_flags);
-}
-
 static const struct bin_attribute ks8995_registers_attr = {
 	.attr = {
 		.name   = "registers",
@@ -449,38 +425,22 @@ static int ks8995_probe(struct spi_device *spi)
 	ks->spi = spi;
 	ks->chip = &ks8995_chip[variant];
 
-	if (ks->spi->dev.of_node) {
-		ks->pdata = devm_kzalloc(&spi->dev, sizeof(*ks->pdata),
-					 GFP_KERNEL);
-		if (!ks->pdata)
-			return -ENOMEM;
-
-		ks->pdata->reset_gpio = -1;
-
-		ks8995_parse_dt(ks);
+	ks->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+						 GPIOD_OUT_HIGH);
+	err = PTR_ERR_OR_ZERO(ks->reset_gpio);
+	if (err) {
+		dev_err(&spi->dev,
+			"failed to get reset gpio: %d\n", err);
+		return err;
 	}
 
-	if (!ks->pdata)
-		ks->pdata = spi->dev.platform_data;
+	err = gpiod_set_consumer_name(ks->reset_gpio, "switch-reset");
+	if (err)
+		return err;
 
 	/* de-assert switch reset */
-	if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio)) {
-		unsigned long flags;
-
-		flags = (ks->pdata->reset_gpio_flags == OF_GPIO_ACTIVE_LOW ?
-			 GPIOF_ACTIVE_LOW : 0);
-
-		err = devm_gpio_request_one(&spi->dev,
-					    ks->pdata->reset_gpio,
-					    flags, "switch-reset");
-		if (err) {
-			dev_err(&spi->dev,
-				"failed to get reset-gpios: %d\n", err);
-			return -EIO;
-		}
-
-		gpiod_set_value(gpio_to_desc(ks->pdata->reset_gpio), 0);
-	}
+	/* FIXME: this likely requires a delay */
+	gpiod_set_value_cansleep(ks->reset_gpio, 0);
 
 	spi_set_drvdata(spi, ks);
 
@@ -524,8 +484,7 @@ static void ks8995_remove(struct spi_device *spi)
 	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);
 
 	/* assert reset */
-	if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio))
-		gpiod_set_value(gpio_to_desc(ks->pdata->reset_gpio), 1);
+	gpiod_set_value_cansleep(ks->reset_gpio, 1);
 }
 
 /* ------------------------------------------------------------------------ */
-- 
2.37.2.789.g6183377224-goog