linux-kernel - Re: [PATCH v3 3/6] dt-bindings: add binding for Sitronix ST7586 display panels

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Date:   Fri, 4 Aug 2017 11:51:22 -0500
From:   David Lechner <david@...hnology.com>
To:     Noralf Trønnes <noralf@...nnes.org>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] dt-bindings: add binding for Sitronix ST7586
 display panels

On 08/04/2017 04:48 AM, Noralf Trønnes wrote:
> 
> Den 04.08.2017 00.33, skrev David Lechner:
>> This adds a new binding for Sitronix ST7586 display panels.
>>
>> Using lego as the vendor prefix in the compatible string because the 
>> display
>> panel I am working with is an integral part of the LEGO MINDSTORMS EV3.
> 
> Is this display available outside of this Lego part?
No, it is not.

> If not you can remove the properties you don't need for this particular
> display setup. Another st7586 display with a different panel would need
> a different initialization sequence and compatible string, so we can
> add properties when/if that happens.

OK. so I will drop power-supply and backlight.

Should I remove these from the driver as well? There are some panels out 
there that could use them.[1]

[1]: 
http://www.buydisplay.com/download/manual/ERC240160-1_Series_Datasheet.pdf

> 
> Noralf.
> 
>> Signed-off-by: David Lechner <david@...hnology.com>
>> ---
>>   .../bindings/display/sitronix,st7586.txt           | 26 
>> ++++++++++++++++++++++
>>   1 file changed, 26 insertions(+)
>>   create mode 100644 
>> Documentation/devicetree/bindings/display/sitronix,st7586.txt
>>
>> diff --git 
>> a/Documentation/devicetree/bindings/display/sitronix,st7586.txt 
>> b/Documentation/devicetree/bindings/display/sitronix,st7586.txt
>> new file mode 100644
>> index 0000000..dfb0b7b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/sitronix,st7586.txt
>> @@ -0,0 +1,26 @@
>> +Sitronix ST7586 display panel
>> +
>> +Required properties:
>> +- compatible:    "lego,ev3-lcd".
>> +
>> +The node for this driver must be a child node of a SPI controller, hence
>> +all mandatory properties described in ../spi/spi-bus.txt must be 
>> specified.
>> +
>> +Optional properties:
>> +- dc-gpios:    D/C pin. The presence/absence of this GPIO determines
>> +        the panel interface operation mode (IF[3:1] pins):
>> +        - present: IF=011 4-wire 8-bit data serial interface
>> +        - absent:  IF=010 3-wire 9-bit data serial interface
>> +- reset-gpios:    Reset pin
>> +- power-supply:    A regulator node for the supply voltage.
>> +- backlight:    phandle of the backlight device attached to the panel
>> +- rotation:    panel rotation in degrees counter clockwise 
>> (0,90,180,270)
>> +
>> +Example:
>> +    display@0{
>> +        compatible = "lego,ev3-lcd";
>> +        reg = <0>;
>> +        spi-max-frequency = <10000000>;
>> +        dc-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
>> +        reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
>> +    };
>