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gpio: allow passing NULL to gpio_request_by_line_name() to search all gpio controllers
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@prevas.dk> Reviewed-by: Simon Glass <sjg@chromium.org>
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2 changed files with 9 additions and 1 deletions
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@ -1171,6 +1171,13 @@ int gpio_request_by_line_name(struct udevice *dev, const char *line_name,
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{
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{
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int ret;
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int ret;
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if (!dev) {
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uclass_foreach_dev_probe(UCLASS_GPIO, dev)
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if (!gpio_request_by_line_name(dev, line_name, desc, flags))
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return 0;
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return -ENOENT;
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}
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ret = dev_read_stringlist_search(dev, "gpio-line-names", line_name);
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ret = dev_read_stringlist_search(dev, "gpio-line-names", line_name);
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if (ret < 0)
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if (ret < 0)
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return ret;
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return ret;
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@ -580,7 +580,8 @@ int gpio_request_by_name(struct udevice *dev, const char *list_name,
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* This allows boards to implement common behaviours using GPIOs while not
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* This allows boards to implement common behaviours using GPIOs while not
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* requiring specific GPIO offsets be used.
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* requiring specific GPIO offsets be used.
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*
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*
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* @dev: An instance of a GPIO controller udevice
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* @dev: An instance of a GPIO controller udevice, or NULL to search
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* all GPIO controller devices
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* @line_name: The name of the GPIO (e.g. "bmc-secure-boot")
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* @line_name: The name of the GPIO (e.g. "bmc-secure-boot")
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* @desc: A GPIO descriptor that is populated with the requested GPIO
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* @desc: A GPIO descriptor that is populated with the requested GPIO
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* upon return
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* upon return
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