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

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Date:   Fri, 05 Aug 2022 18:18:34 +0800
From:   Liu Ying <victor.liu@....com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 Thu, 2022-08-04 at 13:17 +0200, Krzysztof Kozlowski wrote:
> 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.

Thanks for the review.

> 
> > +
> > +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.

I may add some children whose compatible strings are in-tree for
i.MX8qxp. It seems that simple-pm-bus driver part(patch 1) will be
changed due to comments, so maybe I'll respin when it's ready.

Regards,
Liu Ying

> 
> Best regards,
> Krzysztof