linux-kernel - [PATCH 1/2] gpio: provide for_each

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Message-Id: <20240215083328.11464-1-brgl@bgdev.pl>
Date: Thu, 15 Feb 2024 09:33:27 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 1/2] gpio: provide for_each_gpio()

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

We only provide iterators for requested GPIOs to provider drivers. In
order to allow them to display debug information about all GPIOs, let's
provide a variant for iterating over all GPIOs.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 include/linux/gpio/driver.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 9d0023f83a57..5f915b653548 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -551,6 +551,21 @@ DEFINE_CLASS(_gpiochip_for_each_data,
 	     }),
 	     const char **label, int *i)
 
+/**
+ * for_each_gpio - Iterates over all GPIOs for given chip.
+ * @_chip: Chip to iterate over.
+ * @_i: Loop counter.
+ * @_label: Place to store the address of the label if the GPIO is requested.
+ *          Set to NULL for unused GPIOs.
+ */
+#define for_each_gpio(_chip, _i, _label) \
+	for (CLASS(_gpiochip_for_each_data, _data)(&_label, &_i); \
+	     *_data.i < _chip->ngpio; \
+	     (*_data.i)++, kfree(*(_data.label)), *_data.label = NULL) \
+		if (IS_ERR(*_data.label = \
+			gpiochip_dup_line_label(_chip, *_data.i))) {} \
+		else
+
 /**
  * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
  * @_chip:	the chip to query
-- 
2.40.1