diff options
Diffstat (limited to 'include/asm-generic/gpio.h')
| -rw-r--r-- | include/asm-generic/gpio.h | 53 |
1 files changed, 48 insertions, 5 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index 68b5f0b..4aa0004 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -207,6 +207,16 @@ int gpio_requestf(unsigned gpio, const char *fmt, ...) struct fdtdec_phandle_args; /** + * gpio_xlate_offs_flags() - implementation for common use of dm_gpio_ops.xlate + * + * This routine sets the offset field to args[0] and the flags field to + * GPIOD_ACTIVE_LOW if the GPIO_ACTIVE_LOW flag is present in args[1]. + * + */ +int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc, + struct fdtdec_phandle_args *args); + +/** * struct struct dm_gpio_ops - Driver model GPIO operations * * Refer to functions above for description. These function largely copy @@ -241,6 +251,8 @@ struct dm_gpio_ops { int value); int (*get_value)(struct udevice *dev, unsigned offset); int (*set_value)(struct udevice *dev, unsigned offset, int value); + int (*get_open_drain)(struct udevice *dev, unsigned offset); + int (*set_open_drain)(struct udevice *dev, unsigned offset, int value); /** * get_function() Get the GPIO function * @@ -258,12 +270,11 @@ struct dm_gpio_ops { * * @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) + * @desc->offset to 0 * - * 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. + * This method is optional and defaults to gpio_xlate_offs_flags, + * which will parse offset and the GPIO_ACTIVE_LOW flag in the first + * two arguments. * * Note that @dev is passed in as a parameter to follow driver model * uclass conventions, even though it is already available as @@ -541,6 +552,38 @@ int dm_gpio_get_value(const struct gpio_desc *desc); int dm_gpio_set_value(const struct gpio_desc *desc, int value); /** + * dm_gpio_get_open_drain() - Check if open-drain-mode of a GPIO is active + * + * This checks if open-drain-mode for a GPIO is enabled or not. This method is + * optional. + * + * @desc: GPIO description containing device, offset and flags, + * previously returned by gpio_request_by_name() + * @return Value of open drain mode for GPIO (0 for inactive, 1 for active) or + * -ve on error + */ +int dm_gpio_get_open_drain(struct gpio_desc *desc); + +/** + * dm_gpio_set_open_drain() - Switch open-drain-mode of a GPIO on or off + * + * This enables or disables open-drain mode for a GPIO. This method is + * optional; if the driver does not support it, nothing happens when the method + * is called. + * + * In open-drain mode, instead of actively driving the output (Push-pull + * output), the GPIO's pin is connected to the collector (for a NPN transistor) + * or the drain (for a MOSFET) of a transistor, respectively. The pin then + * either forms an open circuit or a connection to ground, depending on the + * state of the transistor. + * + * @desc: GPIO description containing device, offset and flags, + * previously returned by gpio_request_by_name() + * @return 0 if OK, -ve on error + */ +int dm_gpio_set_open_drain(struct gpio_desc *desc, int value); + +/** * dm_gpio_set_dir() - Set the direction for a GPIO * * This sets up the direction according tot the provided flags. It will do |