linux-kernel - Re: [PATCH 2/8] dt-bindings: display: bridge: thc63lvd1024: Add lvds map property

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Message-ID: <17d6f6b0-e657-4a5f-63a6-572cdf062bd3@axentia.se>
Date:   Sun, 22 Apr 2018 22:02:41 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>, architt@...eaurora.org,
        a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
        airlied@...ux.ie
Cc:     daniel@...ll.ch, linux-renesas-soc@...r.kernel.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] dt-bindings: display: bridge: thc63lvd1024: Add lvds
 map property

On 2018-04-19 11:31, Jacopo Mondi wrote:
> The THC63LVD1024 LVDS to RGB bridge supports two different input mapping
> modes, selectable by means of an external pin.
> 
> Describe the LVDS mode map through a newly defined mandatory property in
> device tree bindings.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  .../devicetree/bindings/display/bridge/thine,thc63lvd1024.txt          | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> index 37f0c04..0937595 100644
> --- a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt
> @@ -12,6 +12,8 @@ Required properties:
>  - compatible: Shall be "thine,thc63lvd1024"
>  - vcc-supply: Power supply for TTL output, TTL CLOCKOUT signal, LVDS input,
>    PPL and digital circuitry
> +- thine,map: LVDS mapping mode selection signal, pin name "MAP". Shall be <1>
> +  for mapping mode 1, <0> for mapping mode 2

Since the MAP pin is an input pin, I would expect there to be an optional gpio
specifier like thine,map-gpios so that the driver can set it according to
the value given in thine,map in case the HW has a line from some gpio output
to the MAP pin (instead of hardwired hi/low which seem to be your thinking).

Cheers,
Peter

>  
>  Optional properties:
>  - powerdown-gpios: Power down GPIO signal, pin name "/PDWN". Active low
> @@ -36,6 +38,7 @@ Example:
>  
>  		vcc-supply = <&reg_lvds_vcc>;
>  		powerdown-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
> +		thine,map = <1>;
>  
>  		ports {
>  			#address-cells = <1>;
>