linux-kernel - Re: [PATCH v3 3/3] dt-bindings: bus: Add Freescale i.MX8qxp pixel link MSI bus binding

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Date:   Thu, 4 Aug 2022 13:17:10 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Liu Ying <victor.liu@....com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, saravanak@...gle.com,
        gregkh@...uxfoundation.org, geert+renesas@...der.be,
        robh@...nel.org
Subject: Re: [PATCH v3 3/3] dt-bindings: bus: Add Freescale i.MX8qxp pixel
 link MSI bus binding

On 04/08/2022 08:11, Liu Ying wrote:
> Freescale i.MX8qxp pixel link MSI bus is a simple memory-mapped bus.
> It is used to access peripherals in i.MX8qm/qxp imaging, LVDS, MIPI
> DSI and HDMI TX subsystems, like I2C controller, PWM controller,
> MIPI DSI controller and Control and Status Registers (CSR) module.
> 
> Reference simple-pm-bus bindings and add Freescale i.MX8qxp pixel
> link MSI bus specific bindings.
> 
> Signed-off-by: Liu Ying <victor.liu@....com>

Thank you for your patch. There is something to discuss/improve.

> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8-lpcg.h>
> +    #include <dt-bindings/firmware/imx/rsrc.h>
> +    bus@...00000 {
> +        compatible = "fsl,imx8qxp-display-pixel-link-msi-bus", "simple-pm-bus";
> +        reg = <0x56200000 0x20000>;
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        interrupt-parent = <&dc0_irqsteer>;
> +        interrupts = <320>;
> +        ranges;
> +        clocks = <&dc0_disp_ctrl_link_mst0_lpcg IMX_LPCG_CLK_4>,
> +                 <&dc0_disp_ctrl_link_mst0_lpcg IMX_LPCG_CLK_4>;
> +        clock-names = "msi", "ahb";
> +        power-domains = <&pd IMX_SC_R_DC_0>;

The example should be complete, so you should have here children.
Otherwise it is not a bus.

Best regards,
Krzysztof