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

[Giulio Benetti]

Hi Gianluca,

On 2/19/21 11:38 AM, gianluca wrote:
> 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?

Of course!

> 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

Unfortunately board can't be changed, thanks though.

Best regards
-- 
Giulio Benetti
Benetti Engineering sas