linux-kernel - [PATCH 04/12] gpio: exar: use new line value setter callbacks

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Message-Id: <20250407-gpiochip-set-rv-gpio-part1-v1-4-78399683ca38@linaro.org>
Date: Mon, 07 Apr 2025 09:13:13 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Orson Zhai <orsonzhai@...il.com>, 
 Baolin Wang <baolin.wang@...ux.alibaba.com>, 
 Chunyan Zhang <zhang.lyra@...il.com>, Andy Shevchenko <andy@...nel.org>, 
 Peter Tyser <ptyser@...-inc.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 04/12] gpio: exar: use new line value setter callbacks

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-exar.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c
index d5909a4f0433..beb98286d13e 100644
--- a/drivers/gpio/gpio-exar.c
+++ b/drivers/gpio/gpio-exar.c
@@ -93,8 +93,8 @@ static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
 	return !!(regmap_test_bits(exar_gpio->regmap, addr, BIT(bit)));
 }
 
-static void exar_set_value(struct gpio_chip *chip, unsigned int offset,
-			   int value)
+static int exar_set_value(struct gpio_chip *chip, unsigned int offset,
+			  int value)
 {
 	struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
 	unsigned int addr = exar_offset_to_lvl_addr(exar_gpio, offset);
@@ -105,7 +105,7 @@ static void exar_set_value(struct gpio_chip *chip, unsigned int offset,
 	 * regmap_write_bits() forces value to be written when an external
 	 * pull up/down might otherwise indicate value was already set.
 	 */
-	regmap_write_bits(exar_gpio->regmap, addr, BIT(bit), bit_value);
+	return regmap_write_bits(exar_gpio->regmap, addr, BIT(bit), bit_value);
 }
 
 static int exar_direction_output(struct gpio_chip *chip, unsigned int offset,
@@ -114,11 +114,13 @@ static int exar_direction_output(struct gpio_chip *chip, unsigned int offset,
 	struct exar_gpio_chip *exar_gpio = gpiochip_get_data(chip);
 	unsigned int addr = exar_offset_to_sel_addr(exar_gpio, offset);
 	unsigned int bit = exar_offset_to_bit(exar_gpio, offset);
+	int ret;
 
-	exar_set_value(chip, offset, value);
-	regmap_clear_bits(exar_gpio->regmap, addr, BIT(bit));
+	ret = exar_set_value(chip, offset, value);
+	if (ret)
+		return ret;
 
-	return 0;
+	return regmap_clear_bits(exar_gpio->regmap, addr, BIT(bit));
 }
 
 static int exar_direction_input(struct gpio_chip *chip, unsigned int offset)
@@ -209,7 +211,7 @@ static int gpio_exar_probe(struct platform_device *pdev)
 	exar_gpio->gpio_chip.direction_input = exar_direction_input;
 	exar_gpio->gpio_chip.get_direction = exar_get_direction;
 	exar_gpio->gpio_chip.get = exar_get_value;
-	exar_gpio->gpio_chip.set = exar_set_value;
+	exar_gpio->gpio_chip.set_rv = exar_set_value;
 	exar_gpio->gpio_chip.base = -1;
 	exar_gpio->gpio_chip.ngpio = ngpios;
 	exar_gpio->index = index;

-- 
2.45.2