Re: [PATCH v8 1/8] dt-bindings: display: panel: Add BOE tv101wum-n16 panel bindings

From: Sam Ravnborg <sam@ravnborg.org>
To: Jitao Shi <jitao.shi@mediatek.com>
Cc: Thierry Reding <thierry.reding@gmail.com>,
	David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
	yingjoe.chen@mediatek.com, eddie.huang@mediatek.com,
	cawa.cheng@mediatek.com, bibby.hsieh@mediatek.com,
	ck.hu@mediatek.com, stonea168@163.com
Subject: Re: [PATCH v8 1/8] dt-bindings: display: panel: Add BOE tv101wum-n16 panel bindings
Date: Wed, 15 Jan 2020 22:21:06 +0100	[thread overview]
Message-ID: <20200115212106.GD28904@ravnborg.org> (raw)
In-Reply-To: <20200115135958.126303-2-jitao.shi@mediatek.com>

Hi Jitao.

A few comments that I missed in last round.

Please consider to combine the three panels in one binding.
I realise they are almost identical so no need for three binding files.

On Wed, Jan 15, 2020 at 09:59:51PM +0800, Jitao Shi wrote:
> Add documentation for boe tv101wum-n16 panel.
> 
> Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
> Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> ---
>  .../display/panel/boe,tv101wum-nl6.yaml       | 74 +++++++++++++++++++
>  1 file changed, 74 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/boe,tv101wum-nl6.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/boe,tv101wum-nl6.yaml b/Documentation/devicetree/bindings/display/panel/boe,tv101wum-nl6.yaml
> new file mode 100644
> index 000000000000..d38aee22d406
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/boe,tv101wum-nl6.yaml
> @@ -0,0 +1,74 @@
> +# SPDX-License-Identifier: GPL-2.0

Please use (GPL-2.0-only OR BSD-2-Clause) for all new bindings.
(Sorry if this was not part of my previous feedback)

	Sam

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/boe,tv101wum-nl6.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: BOE TV101WUM-Nl6 DSI Display Panel
> +
> +maintainers:
> +  - Thierry Reding <thierry.reding@gmail.com>
> +  - Sam Ravnborg <sam@ravnborg.org>

> +  - Rob Herring <robh+dt@kernel.org>
Rob is not a typical maintainer of panel bindings.
The fallback it Thierry and me.

But if you have agreed this with Rob then all is good.

> +
> +allOf:
> +  - $ref: panel-common.yaml#
> +
> +properties:
> +  compatible:
> +        const: boe,tv101wum-nl6
> +
> +  reg:
> +    description: the virtual channel number of a DSI peripheral
> +
> +  enable-gpios:
> +    description: a GPIO spec for the enable pin
> +
> +  pp1800-supply:
> +    description: core voltage supply
> +
> +  avdd-supply:
> +    description: phandle of the regulator that provides positive voltage
> +
> +  avee-supply:
> +    description: phandle of the regulator that provides negative voltage
> +
> +  backlight:
> +    description: phandle of the backlight device attached to the panel
> +
> +  port: true
> +
> +required:
> + - compatible
> + - reg
> + - enable-gpios
> + - pp1800-supply
> + - avdd-supply
> + - avee-supply

> + - backlight
I would be suprised if backlight is a required node.
You could always tie the input to a fixed voltage and then no backlight
node are required.
Please remove from the required list unless you can convince me
otherwise.

	Sam

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    dsi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        panel@0 {
> +            compatible = "boe,tv101wum-nl6";
> +            reg = <0>;
> +            enable-gpios = <&pio 45 0>;
> +            avdd-supply = <&ppvarn_lcd>;
> +            avee-supply = <&ppvarp_lcd>;
> +            pp1800-supply = <&pp1800_lcd>;
> +            backlight = <&backlight_lcd0>;
> +            status = "okay";
> +            port {
> +                panel_in: endpoint {
> +                    remote-endpoint = <&dsi_out>;
> +                };
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.21.0