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

[Hans Verkuil]

On 31/08/17 16:10, Linus Walleij wrote:
> 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>

Thank you for the gpio crash course! :-)

	Hans