linux-kernel - Re: [PATCH v3 3/4] dt-bindings: display: imx: add bindings for DCSS

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Message-ID: <7716263db71ca07a52e5a562882f0ae7f35fee48.camel@pengutronix.de>
Date:   Mon, 24 Feb 2020 18:21:57 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Laurentiu Palcu <laurentiu.palcu@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     agx@...xcpu.org, lukas@...mn.com, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] dt-bindings: display: imx: add bindings for DCSS

On Fr, 2019-12-06 at 11:52 +0200, Laurentiu Palcu wrote:
> Add bindings for iMX8MQ Display Controller Subsystem.
> 
> Signed-off-by: Laurentiu Palcu <laurentiu.palcu@....com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../bindings/display/imx/nxp,imx8mq-dcss.yaml      | 86 ++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml b/Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml
> new file mode 100644
> index 00000000..efd2494
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2019 NXP
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/display/imx/nxp,imx8mq-dcss.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: iMX8MQ Display Controller Subsystem (DCSS)
> +
> +maintainers:
> +  - Laurentiu Palcu <laurentiu.palcu@....com>
> +
> +description:
> +
> +  The DCSS (display controller sub system) is used to source up to three
> +  display buffers, compose them, and drive a display using HDMI 2.0a(with HDCP
> +  2.2) or MIPI-DSI.

HDMI 2.0a and MIPI_DSI are not really properties of the DCSS, but
rather the connected bridges. Maybe just drop them here?

>  The DCSS is intended to support up to 4kp60 displays. HDR10
> +  image processing capabilities are included to provide a solution capable of
> +  driving next generation high dynamic range displays.
> +
> +properties:
> +  compatible:
> +    const: nxp,imx8mq-dcss
> +
> +  reg:
> +    maxItems: 2
> +
> +  interrupts:
> +    maxItems: 3
> +    items:
> +      - description: Context loader completion and error interrupt
> +      - description: DTG interrupt used to signal context loader trigger time
> +      - description: DTG interrupt for Vblank
> +
> +  interrupt-names:
> +    maxItems: 3
> +    items:
> +      - const: ctx_ld

Can we make this just "ctxld" for a bit more consistency with the name
below?

> +      - const: ctxld_kick
> +      - const: vblank
> +
> +  clocks:
> +    maxItems: 5
> +    items:
> +      - description: Display APB clock for all peripheral PIO access interfaces
> +      - description: Display AXI clock needed by DPR, Scaler, RTRAM_CTRL
> +      - description: RTRAM clock
> +      - description: Pixel clock, can be driver either by HDMI phy clock or MIPI
> +      - description: DTRC clock, needed by video decompressor
> +
> +  clock-names:
> +    items:
> +      - const: apb
> +      - const: axi
> +      - const: rtrm
> +      - const: pix
> +      - const: dtrc
> +
> +  port@0:
> +    type: object
> +    description: A port node pointing to a hdmi_in or mipi_in port node.

"A port node pointing to the input port of a HDMI/DP or MIPI display
bridge".

> +
> +examples:
> +  - |
> +    dcss: display-controller@...00000 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        compatible = "nxp,imx8mq-dcss";
> +        reg = <0x32e00000 0x2d000>, <0x32e2f000 0x1000>;
> +        interrupts = <6>, <8>, <9>;
> +        interrupt-names = "ctx_ld", "ctxld_kick", "vblank";
> +        interrupt-parent = <&irqsteer>;
> +        clocks = <&clk 248>, <&clk 247>, <&clk 249>,
> +                 <&clk 254>,<&clk 122>;
> +        clock-names = "apb", "axi", "rtrm", "pix", "dtrc";
> +        assigned-clocks = <&clk 107>, <&clk 109>, <&clk 266>;
> +        assigned-clock-parents = <&clk 78>, <&clk 78>, <&clk 3>;
> +        assigned-clock-rates = <800000000>,
> +                               <400000000>;
> +        port@0 {
> +            dcss_out: endpoint {
> +                remote-endpoint = <&hdmi_in>;
> +            };
> +        };
> +    };
> +