[PATCH] gpio: allow passing NULL to gpio_request_by_line_name() to search all gpio controllers
Rasmus Villemoes
rasmus.villemoes at prevas.dk
Fri Mar 17 21:12:22 CET 2023
The API is more convenient to use if one doesn't have to know upfront
which gpio controller has a line with the name one is searching for,
and arrange to look that device up somehow. Or implement this loop
oneself.
Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
---
drivers/gpio/gpio-uclass.c | 7 +++++++
include/asm-generic/gpio.h | 3 ++-
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index 0ed32b7217..4912dc8375 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -1192,6 +1192,13 @@ int gpio_request_by_line_name(struct udevice *dev, const char *line_name,
{
int ret;
+ if (!dev) {
+ uclass_foreach_dev_probe(UCLASS_GPIO, dev)
+ if (!gpio_request_by_line_name(dev, line_name, desc, flags))
+ return 0;
+ return -ENOENT;
+ }
+
ret = dev_read_stringlist_search(dev, "gpio-line-names", line_name);
if (ret < 0)
return ret;
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 81f63f06f1..44ca2458cf 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -587,7 +587,8 @@ int gpio_request_by_name(struct udevice *dev, const char *list_name,
* This allows boards to implement common behaviours using GPIOs while not
* requiring specific GPIO offsets be used.
*
- * @dev: An instance of a GPIO controller udevice
+ * @dev: An instance of a GPIO controller udevice, or NULL to search
+ * all GPIO controller devices
* @line_name: The name of the GPIO (e.g. "bmc-secure-boot")
* @desc: A GPIO descriptor that is populated with the requested GPIO
* upon return
--
2.37.2
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