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authorMarkus Pargmann <mpa@pengutronix.de>2015-08-14 16:10:59 +0200
committerLinus Walleij <linus.walleij@linaro.org>2015-09-24 10:48:51 -0700
commitc0017ed71966a19ec40c7bc900d4338ddfbc4105 (patch)
tree7353a78f2cbdd6602f83b23f4a5a99fff5af8ae0 /include/linux/gpio
parentfd7337fdb9bce420033c28af4c07b73e34e692c1 (diff)
gpio: Introduce gpio descriptor 'name'
The latest gpio hogging mechanism assigns each gpio a 'line-name' in the devicetree. The 'name' field is different from the 'label' field. 'label' is only used for requested GPIOs to describe its current use by driver or userspace. The 'name' field describes the GPIO itself, not the use. This is most likely identical to the label in the schematic on the GPIO line and should help to find this particular GPIO. This is equivalent to the gpiochip->names array. However names should be stored in the GPIO descriptor. We will use gpiochip->names in the future only as initializer for the GPIO descriptors for drivers that assign GPIO names hardcoded. All other GPIO names will be parsed from DT and directly assigned to the GPIO descriptor. This patch adds a helper function to find gpio descriptors by name instead of gpio number. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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 14cac67c2012..366a3fdbdbea 100644
--- a/include/linux/gpio/consumer.h
+++ b/include/linux/gpio/consumer.h
@@ -130,6 +130,7 @@ int gpiod_to_irq(const struct gpio_desc *desc);
/* Convert between the old gpio_ and new gpiod_ interfaces */
struct gpio_desc *gpio_to_desc(unsigned gpio);
int desc_to_gpio(const struct gpio_desc *desc);
+struct gpio_desc *gpio_name_to_desc(const char *name);
/* Child properties interface */
struct fwnode_handle;
@@ -400,6 +401,12 @@ static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
{
return ERR_PTR(-EINVAL);
}
+
+static inline struct gpio_desc *gpio_name_to_desc(const char *name)
+{
+ return ERR_PTR(-EINVAL);
+}
+
static inline int desc_to_gpio(const struct gpio_desc *desc)
{
/* GPIO can never have been requested */