[U-Boot] [PATCH 07/21] dm: gpio: Add better functions to request GPIOs

[Simon Glass]

On 5 January 2015 at 20:05, Simon Glass <sjg at chromium.org> wrote:
> At present U-Boot sort-of supports the standard way of reading GPIOs from
> device tree nodes, but the support is incomplete, a bit clunky and only
> works for GPIO bindings where #gpio-cells is 2.
>
> Add new functions to request GPIOs, taking full account of the device
> tree binding. These permit requesting a GPIO with a simple call like:
>
>    gpio_request_by_name(dev, "cd-gpios", 0, &desc, GPIOD_IS_IN);
>
> This will request the GPIO, looking at the device's node which might be
> this, for example:
>
>    cd-gpios = <&gpio TEGRA_GPIO(B, 3) GPIO_ACTIVE_LOW>;
>
> The GPIO will be set to input mode in this case and polarity will be
> honoured by the GPIO calls.
>
> It is also possible to request and free a list of GPIOs.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
>  drivers/gpio/gpio-uclass.c | 166 ++++++++++++++++++++++++++++++++++++-
>  drivers/gpio/sandbox.c     |  20 +++++
>  include/asm-generic/gpio.h | 199 +++++++++++++++++++++++++++++++++++++++++++++
>  test/dm/gpio.c             |  69 +++++++++++++++-
>  test/dm/test.dts           |  11 ++-
>  5 files changed, 461 insertions(+), 4 deletions(-)

Applied to u-boot-dm.