Re: [PATCH 3/4] OMAPDSS: panel-sharp-ls037v7dw01: add device tree support

Tomi Valkeinen
2014-05-07T16:02:40Z

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On 07/05/14 18:03, Tony Lindgren wrote:

>>> + lcd0: display {
>>> + compatible = "sharp,ls037v7dw01";
>>> + power-supply = <&lcd_3v3>;
>>> + reset-gpios = <&gpio5 27 GPIO_ACTIVE_HIGH>; /* gpio155, lcd RESB */
>>> + enable-gpios = <&gpio5 26 GPIO_ACTIVE_HIGH /* gpio154, lcd MO */
>>> + &gpio1 2 GPIO_ACTIVE_HIGH /* gpio2, lcd LR */
>>> + &gpio1 3 GPIO_ACTIVE_HIGH /* gpio3, lcd UD */
>>> + &gpio5 24 GPIO_ACTIVE_HIGH>; /* gpio152, lcd INI */
>>
>> Why are most of the gpios in 'enable-gpios'? MO, LR and UD don't really
>> have anything to do with enabling the panel. Why not just have one
>> 'gpios' array with all the gpios, as they are quite a mixed bunch?
>
> Yeah that's what I had initially, but reading simple-panel.txt noticed
> there are some standardized GPIOs for reset and enable.

I'm not sure if it's worth to try to make it compatible with
simple-panel. simple-panel bindings do not work with omapdss anyway, and
simple-panel doesn't have the support for input ports/endpoints.

Can the panel be used with only one gpio (I guess that would be INI or
RESB)? If not, simple-panel doesn't work.

> How about we set up one reset-gpios, one enable-gpios and an array of
> three unlabelled GPIOs?
>
> Or if we want to add something generic, we could add new mode-gpios
> property that other panels might be able to use too?
>
> BTW, I'm also personally fine with all five gpios showing in a single
> gpios property, I'm not too exited about naming anything in DT..

I don't have a strong opinion here. I don't have much experience with
DT, especially with making bindings compatible with other ones.

I'd just forget the simple-panel, and have single gpio array.

Tomi

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