linux-kernel - Re: [PATCH v8 5/5] dt-bindings: display: imx: add bindings for DCSS

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Date:   Wed, 29 Jul 2020 15:27:30 +0200
From:   Guido Günther <agx@...xcpu.org>
To:     Laurentiu Palcu <laurentiu.palcu@....nxp.com>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        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>, lukas@...mn.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Laurentiu Palcu <laurentiu.palcu@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 5/5] dt-bindings: display: imx: add bindings for DCSS

Hi,
On Fri, Jul 24, 2020 at 12:07:34PM +0300, Laurentiu Palcu wrote:
> From: Laurentiu Palcu <laurentiu.palcu@....com>
> 
> 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 | 104 ++++++++++++++++++
>  1 file changed, 104 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 000000000000..68e4635e4874
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/imx/nxp,imx8mq-dcss.yaml
> @@ -0,0 +1,104 @@
> +# 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. 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:
> +    items:
> +      - description: DCSS base address and size, up to IRQ steer start
> +      - description: DCSS BLKCTL base address and size
> +
> +  interrupts:
> +    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:
> +    items:
> +      - const: ctxld
> +      - const: ctxld_kick
> +      - const: vblank
> +
> +  clocks:
> +    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 driven 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
> +
> +  assigned-clocks:
> +    items:
> +      - description: Phandle and clock specifier of IMX8MQ_CLK_DISP_AXI_ROOT
> +      - description: Phandle and clock specifier of IMX8MQ_CLK_DISP_RTRM
> +      - description: Phandle and clock specifier of either IMX8MQ_VIDEO2_PLL1_REF_SEL or
> +                     IMX8MQ_VIDEO_PLL1_REF_SEL
> +
> +  assigned-clock-parents:
> +    items:
> +      - description: Phandle and clock specifier of IMX8MQ_SYS1_PLL_800M
> +      - description: Phandle and clock specifier of IMX8MQ_SYS1_PLL_800M
> +      - description: Phandle and clock specifier of IMX8MQ_CLK_27M
> +
> +  assigned-clock-rates:
> +    items:
> +      - description: Must be 800 MHz
> +      - description: Must be 400 MHz
> +
> +  port:
> +    type: object
> +    description:
> +      A port node pointing to the input port of a HDMI/DP or MIPI display bridge.
> +
> +additionalProperties: false
> +
> +examples:
> +  - |

it would be nice to

    #include <dt-bindings/clock/imx8mq-clock.h>

here...

> +    dcss: display-controller@...00000 {
> +        compatible = "nxp,imx8mq-dcss";
> +        reg = <0x32e00000 0x2d000>, <0x32e2f000 0x1000>;
> +        interrupts = <6>, <8>, <9>;
> +        interrupt-names = "ctxld", "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>;

so that clock names like IMX8MQ_CLK_DISP_AXI could be used to make this
even more useful.

Cheers,
 -- Guido

> +        assigned-clock-rates = <800000000>,
> +                               <400000000>;
> +        port {
> +            dcss_out: endpoint {
> +                remote-endpoint = <&hdmi_in>;
> +            };
> +        };
> +    };
> +
> -- 
> 2.23.0
>