[PATCHv4 4/5] cec-gpio: add HDMI CEC GPIO driver

[Linus Walleij]

On Thu, Aug 31, 2017 at 1:01 PM, Hans Verkuil <hverkuil at xs4all.nl> wrote:

> From: Hans Verkuil <hans.verkuil at cisco.com>
>
> Add a simple HDMI CEC GPIO driver that sits on top of the cec-pin framework.
>
> While I have heard of SoCs that use the GPIO pin for CEC (apparently an
> early RockChip SoC used that), the main use-case of this driver is to
> function as a debugging tool.
>
> By connecting the CEC line to a GPIO pin on a Raspberry Pi 3 for example
> it turns it into a CEC debugger and protocol analyzer.
>
> With 'cec-ctl --monitor-pin' the CEC traffic can be analyzed.
>
> But of course it can also be used with any hardware project where the
> HDMI CEC line is hooked up to a pull-up gpio line.
>
> In addition this has (optional) support for tracing HPD changes if the
> HPD is connected to a GPIO.
>
> Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>

This looks nice!
Reviewed-by: Linus Walleij <linus.walleij at linaro.org>

Yours,
Linus Walleij