linux-kernel - Re: [PATCH 2/3] dt-bindings: display: bridge: lvds-transmitter: add pwdn-gpios

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Date:   Wed, 19 Dec 2018 09:57:32 +0000
From:   Peter Rosin <peda@...ntia.se>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Archit Taneja <architt@...eaurora.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/3] dt-bindings: display: bridge: lvds-transmitter: add
 pwdn-gpios

On 2018-12-19 10:12, Andrzej Hajda wrote:
> On 19.12.2018 00:19, Peter Rosin wrote:
>> Add optional property to specify a power-down GPIO.
>> The pwdn-gpios name is already in use by the thine,thc63lvdm83d
>> binding, so go with that.
>>
>> Signed-off-by: Peter Rosin <peda@...ntia.se>
>> ---
>>  Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
>> index f9e7dd666f58..47941d39f92f 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
>> +++ b/Documentation/devicetree/bindings/display/bridge/lvds-transmitter.txt
>> @@ -31,6 +31,9 @@ Required properties:
>>    device-specific version corresponding to the device first
>>    followed by the generic version.
>>  
>> +Optional properties:
>> +- pwdn-gpios: Power-down control GPIO
>> +
> 
> 
> Since naming is not enforced by any datasheet I would propose something
> more popular with less twisted logic. Maybe:
> 
> - enable-gpios: ... (active high).

That was my original thought too, but the driver implementing the
lvds-encoder bindings also handles the mentioned thine,thc63lvdm83d
lvds encoder, and that binding has the "pwdn" naming. So, for driver
implementation simplicity I went with what was already there, thus
allowing adding support for both bindings with one implementation
(in patch 3/3).

Adding code just to handle multiple names for the same thing does
not sounds too appealing.

Cheers,
Peter