[PATCH 1/2] ARM: dts: exynos: arndale: use i2c-gpio for HDMI-DDC

[Krzysztof Kozlowski]

On 26 July 2018 at 13:04, Andrzej Hajda <a.hajda at samsung.com> wrote:
> On 26.07.2018 12:23, Krzysztof Kozlowski wrote:
>> On 26 July 2018 at 12:12, Andrzej Hajda <a.hajda at samsung.com> wrote:
>>> HDMI-DDC for unknown reasons doesn't work with Exynos I2C
>>> controllers. Fortunately i2c-gpio comes to the rescue.
>> Wait... what? The I2C controller on SoC (or its driver) is buggy in
>> some way and we need to use these pins as GPIO to run i2c-gpio driver
>> there? It looks like workaround not a proper solution...
>
> But at least working one :) Better solutions are welcome.
> This seems to be not uncommon issue, if you for example look into odroid
> vendor kernel you can even find hardcoded EDIDs :)

I am not sure whether hardkernel's tree is a good argument. They took
vendor's tree and apply whatever patches/fixes are needed to bring it
up. They do not have time to look for correct (the "best") fixes. They
choose whatever is working now.
Better solution would be to spend months and fix the driver. :)

Can you at least mention next to i2c-gpio node that it replaces i2c_2
because of this?

Best regards,
Krzysztof