[PATCH 3/3] ARM: spitz: Use software nodes for the ADS7846 touchscreen

[Linus Walleij]

On Tue, Apr 30, 2024 at 9:04 AM Linus Walleij <linus.walleij at linaro.org> wrote:

> Convert the Spitz to use software nodes for SPI CS and the
> ADS7846 touchscreen following the pattern used in the TI
> platforms.
>
> The Spitz is the only user of the wait_for_sync() callback in
> the platform data, so define that this is a separate GPIO
> in the device tree bindings (previous patch) and handle this
> directly inside the ADS7846 driver instead.
>
> Add some infrastructure to the PXA boardfile common code to
> handle software nodes attached to the SPI bus instead of
> platform data.
>
> The SPI core will investigate the numner of GPIO handles to
> figure out the number of chipselects used on the platform, so
> no explicit encoding of the number of the number of chipselects
> is needed.
>
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>

Andy's patch series makes the Spitz SPI much cleaner to begin
with so I will hold this off and rebase on top of Andy's stuff once
that is in.

Yours,
Linus Walleij