[U-Boot] [PATCH 4/8] gpio: Provide dummy get/request & is_valid functions

[Daniel Schwierzeck]

On 21.11.2017 21:33, Paul Burton 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 at imgtec.com>
> Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: u-boot at lists.denx.de
> Signed-off-by: Paul Burton <paul.burton at mips.com>
> ---
> 
>  include/asm-generic/gpio.h | 38 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>

-- 
- Daniel

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