[PATCH 1/2] dt-bindings: drm/bridge: ti-sn65dsi83: Add enable delay property

[Frieder Schrempf]

On 12.12.22 10:23, Krzysztof Kozlowski wrote:
> On 12/12/2022 10:09, Frieder Schrempf wrote:
>>>>> This does seem like a hardware bug right there, can you double-check
>>>>> this with the hardware engineer ?
>>>>
>>>> Yep, checked with hardware engineer. An 470nF is attached, together
>>>> with an
>>>> open drain output and only the internal pull-up. So yes ~113ms rising
>>>> time
>>>> until 0.7 x VCC.
>>>
>>> I don't suppose you can have that capacitor reduced or better yet, some
>>> external pull up added, can you ?
>>
>> Actually our HW engineers have implemented a similar RC circuit to
>> provide a hardware delay for the EN signal. I think this is due to a
>> design note in the datasheet (see chapter 7.4.1) and therefore it's
>> probably widely spread.
> 
> If I read section 7.4.1 correctly, it would be enough to just add delay
> Ten=1ms instead of the capacitor, right? And that would be
> device-specific. But if one chooses the capacitor solution, it becomes
> now board specific.

Yes, seems like that's the case.