Hi Paul,
On 26 September 2016 at 12:29, Paul Burton paul.burton@imgtec.com wrote:
Allow for drivers to make use of driver model GPIOs when they're enabled & available without needing to #ifdef on CONFIG_DM_GPIO by providing dummy functions covering GPIO requests. Each will simply return -ENODEV or -EINVAL, depending upon which the real implementation returns when a GPIO isn't found. Only the driver model versions of the GPIO request functions are covered & dm_gpio_request is excluded since it's documented as only being of use for debugging, so drivers shouldn't be calling it anyway.
Also provide a dummy dm_gpio_is_valid, with the idea that all other GPIO functions called would be within an if (dm_gpio_is_valid(...)) statement and have been optimised out in cases where that returns a compile-time constant false.
This parallels the clock API, keeping the #ifdefs & checks in a single location allowing drivers or other code to use GPIOs without needing to perform such checks themselves.
Signed-off-by: Paul Burton paul.burton@imgtec.com
include/asm-generic/gpio.h | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+)
Ick - why not just define DM_GPIO? I don't think we want to provide special support for legacy things. It is just confusing.
- Simon