linux-kernel - Re: [PATCH V3 4/9] dt-bindings: soc: add binding for i.MX8MN DISP blk-ctrl

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Message-ID: <YY7kg3GC5lnX7TgW@robh.at.kernel.org>
Date:   Fri, 12 Nov 2021 16:02:43 -0600
From:   Rob Herring <robh@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, aford@...conembedded.com,
        ariel.dalessandro@...labora.com, krzk@...nel.org,
        tharvey@...eworks.com, l.stach@...gutronix.de,
        devicetree@...r.kernel.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>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 4/9] dt-bindings: soc: add binding for i.MX8MN DISP
 blk-ctrl

On Thu, Nov 04, 2021 at 11:17:59AM -0500, Adam Ford wrote:
> Add the DT binding for the i.MX8MN DISP blk-ctrl.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/Documentation/devicetree/bindings/soc/imx/fsl,imx8mn-disp-blk-ctrl.yaml b/Documentation/devicetree/bindings/soc/imx/fsl,imx8mn-disp-blk-ctrl.yaml
> new file mode 100644
> index 000000000000..fbeaac399c50
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx8mn-disp-blk-ctrl.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/imx/fsl,imx8mn-disp-blk-ctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP i.MX8MN DISP blk-ctrl
> +
> +maintainers:
> +  - Lucas Stach <l.stach@...gutronix.de>
> +
> +description:
> +  The i.MX8MN DISP blk-ctrl is a top-level peripheral providing access to
> +  the NoC and ensuring proper power sequencing of the display and MIPI CSI
> +  peripherals located in the DISP domain of the SoC.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: fsl,imx8mn-disp-blk-ctrl
> +      - const: syscon

Are there other functions in this block? If so, what?

> +
> +  reg:
> +    maxItems: 1
> +
> +  '#power-domain-cells':
> +    const: 1
> +
> +  power-domains:
> +    minItems: 5
> +    maxItems: 5
> +
> +  power-domain-names:
> +    items:
> +      - const: bus
> +      - const: isi
> +      - const: lcdif
> +      - const: mipi-dsi
> +      - const: mipi-csi
> +
> +  clocks:
> +    minItems: 11
> +    maxItems: 11
> +
> +  clock-names:
> +    items:
> +      - const: disp_axi
> +      - const: disp_apb
> +      - const: disp_axi_root
> +      - const: disp_apb_root
> +      - const: lcdif-axi
> +      - const: lcdif-apb
> +      - const: lcdif-pix
> +      - const: dsi-pclk
> +      - const: dsi-ref
> +      - const: csi-aclk
> +      - const: csi-pclk
> +
> +required:
> +  - compatible
> +  - reg
> +  - power-domains
> +  - power-domain-names
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mn-clock.h>
> +    #include <dt-bindings/power/imx8mn-power.h>
> +
> +    disp_blk_ctl: blk_ctrl@...28000 {
> +      compatible = "fsl,imx8mn-disp-blk-ctrl", "syscon";
> +      reg = <0x32e28000 0x100>;
> +      power-domains = <&pgc_dispmix>, <&pgc_dispmix>,
> +                      <&pgc_dispmix>, <&pgc_mipi>,
> +                      <&pgc_mipi>;
> +      power-domain-names = "bus", "isi", "lcdif", "mipi-dsi",
> +                           "mipi-csi";

This looks odd. These are the same power domains this node provides.

> +      clocks = <&clk IMX8MN_CLK_DISP_AXI>,
> +               <&clk IMX8MN_CLK_DISP_APB>,
> +               <&clk IMX8MN_CLK_DISP_AXI_ROOT>,
> +               <&clk IMX8MN_CLK_DISP_APB_ROOT>,
> +               <&clk IMX8MN_CLK_DISP_AXI_ROOT>,
> +               <&clk IMX8MN_CLK_DISP_APB_ROOT>,
> +               <&clk IMX8MN_CLK_DISP_PIXEL_ROOT>,
> +               <&clk IMX8MN_CLK_DSI_CORE>,
> +               <&clk IMX8MN_CLK_DSI_PHY_REF>,
> +               <&clk IMX8MN_CLK_CSI1_PHY_REF>,
> +               <&clk IMX8MN_CLK_CAMERA_PIXEL_ROOT>;
> +       clock-names = "disp_axi", "disp_apb", "disp_axi_root", "disp_apb_root",
> +                     "lcdif-axi", "lcdif-apb", "lcdif-pix", "dsi-pclk",
> +                     "dsi-ref", "csi-aclk", "csi-pclk";
> +       #power-domain-cells = <1>;
> +    };
> -- 
> 2.32.0
> 
>