[PATCH 1/2] gpio: provide for_each_gpio()

From: Bartosz Golaszewski
Date: Thu Feb 15 2024 - 03:34:07 EST


From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

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@xxxxxxxxxx>
---
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