[PATCH 4/5] sun7i: add support for Micronova srl s027_3 board

[gianluca]

On 2/19/21 11:18 AM, Giulio Benetti wrote:
> On 2/19/21 11:12 AM, Giulio Benetti wrote:
>> Hi Andre,
>>
>> On 2/19/21 2:44 AM, Andre Przywara wrote:
>>> On Fri, 19 Feb 2021 00:26:19 +0100
>>> Giulio Benetti <giulio.benetti at benettiengineering.com> wrote:
>>>
>>> Hi Giulio,
>>>
>>>> From: Giulio Benetti <giulio.benetti at micronovasrl.com>
>>>>
>>>> Add support for Micronova srl s027_3 board by adding new vendor/board
>>>> folders and using in local Makefile the already present
>>>> board/sunxi/Makefile. The reason is that s027_3 needs a pin to be 
>>>> asserted
>>>> to enable lcd before setting controller up and sunxi board doesn't 
>>>> provide
>>>> a way to do this customization.
>>>
>>> Have you tried CONFIG_VIDEO_LCD_POWER?
>>
>> Yes, I already use that for DISPONOFF.
>>
>>> I am strongly against introducing per-board code files, and we
>>> definitely won't introduce them just for one GPIO.
>>
>> I knew it was a strange hack, but I have 2 different pins to be set high
>> before init video controller. Another idea that comes into my mind is to
>> handle CONFIG_VIDEO_LCD_POWER as a gpio list and iterate/enable, what
>> about that?
> 
> Or introduce CONFIG_VIDEO_LCD_ENABLE, that would be easier. Here is the 
> schematic of my lcd connector to understand:
> https://pasteboard.co/JP3PiYo.png
> 
> I have net LCD_PWR that should be CONFIG_VIDEO_LCD_POWER, while
> net LCD0_DISPONOFF should be CONFIG_VIDEO_LCD_ENABLE.
> 
> At least this is my idea. Do you have any suggestion to make it work?
> 

May I say a word?

Is it possible to wire the LCD0_DISPONOFF (I suppose it is high active) 
with the same pin routed to a SN74LVC1G04 to the pullup thru the Q6 
Transistor?

Supposed there is no such timing restritctions

Regards,
Gianluca
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