diff options
| author | Simon Glass <sjg@chromium.org> | 2015-01-05 20:05:28 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-01-29 17:09:50 -0700 |
| commit | 0dac4d51f50e9252dbc00075cf65eeba57017926 (patch) | |
| tree | 2d31e477c73b0de6a3604092b02e4f5b8ef5a06b /include/asm-generic | |
| parent | ae7123f876357a81fc4c393239a378f1058cad5e (diff) | |
dm: gpio: Add a driver GPIO translation method
Only the GPIO driver knows about the full GPIO device tree binding used by
a device. Add a method to allow the driver to provide this information to the
uclass, including the GPIO offset within the device and flags such as the
polarity.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/gpio.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index a827a56f5e..c08c96340a 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -171,6 +171,8 @@ int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep); int gpio_requestf(unsigned gpio, const char *fmt, ...) __attribute__ ((format (__printf__, 2, 3))); +struct fdtdec_phandle_args; + /** * struct struct dm_gpio_ops - Driver model GPIO operations * @@ -214,6 +216,33 @@ struct dm_gpio_ops { * @return current function - GPIOF_... */ int (*get_function)(struct udevice *dev, unsigned offset); + + /** + * xlate() - Translate phandle arguments into a GPIO description + * + * This function should set up the fields in desc according to the + * information in the arguments. The uclass will have set up: + * + * @desc->dev to @dev + * @desc->flags to 0 + * @desc->offset to the value of the first argument in args, if any, + * otherwise -1 (which is invalid) + * + * This method is optional so if the above defaults suit it can be + * omitted. Typical behaviour is to set up the GPIOD_ACTIVE_LOW flag + * in desc->flags. + * + * Note that @dev is passed in as a parameter to follow driver model + * uclass conventions, even though it is already available as + * desc->dev. + * + * @dev: GPIO device + * @desc: Place to put GPIO description + * @args: Arguments provided in descripion + * @return 0 if OK, -ve on error + */ + int (*xlate)(struct udevice *dev, struct gpio_desc *desc, + struct fdtdec_phandle_args *args); }; /** |