linux-kernel - [PATCH v1 1/1] gpiolib: Introduce for_each_gpio

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Message-Id: <20210510195242.12443-1-andriy.shevchenko@linux.intel.com>
Date:   Mon, 10 May 2021 22:52:42 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v1 1/1] gpiolib: Introduce for_each_gpio_desc() macro

In a few places we are using a loop against all GPIO descriptors
for a given device. Replace it with a consolidated for_each tupe
of macro.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/gpio/gpiolib-of.c    | 9 ++++-----
 drivers/gpio/gpiolib-sysfs.c | 3 +--
 drivers/gpio/gpiolib.c       | 7 ++++---
 drivers/gpio/gpiolib.h       | 6 ++++++
 4 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index bbcc7c073f63..fb1bfbfb3fc3 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -711,13 +711,12 @@ static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
 static void of_gpiochip_remove_hog(struct gpio_chip *chip,
 				   struct device_node *hog)
 {
-	struct gpio_desc *descs = chip->gpiodev->descs;
+	struct gpio_desc *desc;
 	unsigned int i;
 
-	for (i = 0; i < chip->ngpio; i++) {
-		if (test_bit(FLAG_IS_HOGGED, &descs[i].flags) &&
-		    descs[i].hog == hog)
-			gpiochip_free_own_desc(&descs[i]);
+	for_each_gpio_desc(i, chip, desc) {
+		if (test_bit(FLAG_IS_HOGGED, desc->flags) && desc->hog == hog)
+			gpiochip_free_own_desc(desc);
 	}
 }
 
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index ae49bb23c6ed..b0c7a303adde 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -801,8 +801,7 @@ void gpiochip_sysfs_unregister(struct gpio_device *gdev)
 	mutex_unlock(&sysfs_lock);
 
 	/* unregister gpiod class devices owned by sysfs */
-	for (i = 0; i < chip->ngpio; i++) {
-		desc = &gdev->descs[i];
+	for_each_gpio_desc(i, chip, desc) {
 		if (test_and_clear_bit(FLAG_SYSFS, &desc->flags))
 			gpiod_free(desc);
 	}
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 220a9d8dd4e3..d61e11084a09 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4012,11 +4012,12 @@ int gpiod_hog(struct gpio_desc *desc, const char *name,
  */
 static void gpiochip_free_hogs(struct gpio_chip *gc)
 {
+	struct gpio_desc *desc;
 	int id;
 
-	for (id = 0; id < gc->ngpio; id++) {
-		if (test_bit(FLAG_IS_HOGGED, &gc->gpiodev->descs[id].flags))
-			gpiochip_free_own_desc(&gc->gpiodev->descs[id]);
+	for_each_gpio_desc(id, gc, desc) {
+		if (test_bit(FLAG_IS_HOGGED, &desc->flags))
+			gpiochip_free_own_desc(desc);
 	}
 }
 
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 30bc3f80f83e..b6d8d71bfbd5 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -82,6 +82,12 @@ struct gpio_array {
 };
 
 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
+
+#define for_each_gpio_desc(i, gc, desc)			\
+	for (i = 0, desc = gpiochip_get_desc(gc, i);	\
+	     i < gc->ngpio;				\
+	     i++, desc = gpiochip_get_desc(gc, i))	\
+
 int gpiod_get_array_value_complex(bool raw, bool can_sleep,
 				  unsigned int array_size,
 				  struct gpio_desc **desc_array,
-- 
2.30.2