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authorMika Westerberg <mika.westerberg@linux.intel.com>2014-10-21 15:33:59 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-11-04 23:58:23 +0300
commit40b7318319281b1bdec804f6435f26cadd329c13 (patch)
tree4f8e3c4227be32777fc1d1feed621a228804d8b2 /include/linux/gpio
parent8a0662d9ed2968e1186208336a8e1fab3fdfea63 (diff)
downloadlinux-40b7318319281b1bdec804f6435f26cadd329c13.tar.xz
gpio: Support for unified device properties interface
Some drivers need to deal with only firmware representation of its GPIOs. An example would be a GPIO button array driver where each button is described as a separate firmware node in device tree. Typically these child nodes do not have physical representation in the Linux device model. In order to help device drivers to handle such firmware child nodes we add dev[m]_get_named_gpiod_from_child() that takes a child firmware node pointer as its second argument (the first one is the parent device itself), finds the GPIO using whatever is the underlying firmware method, and requests the GPIO properly. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Grant Likely <grant.likely@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/gpio')
-rw-r--r--include/linux/gpio/consumer.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/gpio/consumer.h b/include/linux/gpio/consumer.h
index 12f146fa6604..00b1b70d68ba 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -94,6 +94,13 @@ int gpiod_to_irq(const struct gpio_desc *desc);
struct gpio_desc *gpio_to_desc(unsigned gpio);
int desc_to_gpio(const struct gpio_desc *desc);
+/* Child properties interface */
+struct fwnode_handle;
+
+struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
+ const char *propname);
+struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
+ struct fwnode_handle *child);
#else /* CONFIG_GPIOLIB */
static inline struct gpio_desc *__must_check __gpiod_get(struct device *dev,