[PATCHv5 3/5] dt-bindings: document the CEC GPIO bindings

[Linus Walleij]

On Sat, Sep 16, 2017 at 4:28 PM, Hans Verkuil <hverkuil at xs4all.nl> wrote:
> From: Hans Verkuil <hans.verkuil at cisco.com>
>
> Document the bindings for the cec-gpio module for hardware where the
> CEC line and optionally the HPD line are connected to GPIO lines.
>
> Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>

Just to make things explicit:

> +Required properties:
> +  - compatible: value must be "cec-gpio".
> +  - cec-gpios: gpio that the CEC line is connected to.

Add "The line should be tagged as open drain."

> +Example for the Raspberry Pi 3 where the CEC line is connected to
> +pin 26 aka BCM7 aka CE1 on the GPIO pin header and the HPD line is
> +connected to pin 11 aka BCM17:
> +

#include <dt-bindings/gpio/gpio.h>

> +cec-gpio {
> +       compatible = "cec-gpio";
> +       cec-gpio = <&gpio 7 GPIO_OPEN_DRAIN>;

cec-gpios = <&gpio 7 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;

> +       hpd-gpio = <&gpio 17 GPIO_ACTIVE_HIGH>;

hpd-gpios = ..

With these fixups:
Reviewed-by: Linus Walleij <linus.walleij at linaro.org>

Yours,
Linus Walleij