linux-kernel - Re: [RFC V2 3/6] dt-bindings: media: nxp,imx8mq-vpu: Update the bindings for G2 support

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Message-ID: <Ya96O6VXuIDdcM8p@robh.at.kernel.org>
Date:   Tue, 7 Dec 2021 09:14:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-media@...r.kernel.org, cphealy@...il.com,
        benjamin.gaignard@...labora.com, hverkuil@...all.nl,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev
Subject: Re: [RFC V2 3/6] dt-bindings: media: nxp,imx8mq-vpu: Update the
 bindings for G2 support

On Mon, Dec 06, 2021 at 07:54:42PM -0600, Adam Ford wrote:
> From: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> 
> Introducing the G2 hevc video decoder requires modifications of the bindings to allow
> one node per VPU.

Why? It looks like the G2 part was already described. If you are 
changing this because you want 2 drivers for G1 and G2, then NAK. DT 
nodes and drivers don't have to be 1:1. This change is breaking 
compatibility.

> 
> VPUs share one hardware control block which is provided as a phandle on
> a syscon.

That's not really ideal. Is this really a separate block?

> Each node has now one reg and one interrupt.
> Add a compatible for G2 hardware block: nxp,imx8mq-vpu-g2.
> 
> To be compatible with older DT the driver is still capable to use the 'ctrl'
> reg-name even if it is deprecated now.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/Documentation/devicetree/bindings/media/nxp,imx8mq-vpu.yaml b/Documentation/devicetree/bindings/media/nxp,imx8mq-vpu.yaml
> index 762be3f96ce9..eaeba4ce262a 100644
> --- a/Documentation/devicetree/bindings/media/nxp,imx8mq-vpu.yaml
> +++ b/Documentation/devicetree/bindings/media/nxp,imx8mq-vpu.yaml
> @@ -15,37 +15,36 @@ description:
>  
>  properties:
>    compatible:
> -    const: nxp,imx8mq-vpu
> +    oneOf:
> +      - const: nxp,imx8mq-vpu-g1
> +      - const: nxp,imx8mq-vpu-g2
>  
>    reg:
> -    maxItems: 3
> -
> -  reg-names:
> -    items:
> -      - const: g1
> -      - const: g2
> -      - const: ctrl
> +    maxItems: 1
>  
>    interrupts:
> -    maxItems: 2
> +    maxItems: 1
>  
>    interrupt-names:
> -    items:
> +    oneOf:
>        - const: g1
>        - const: g2
>  
>    clocks:
> -    maxItems: 3
> +    maxItems: 1
>  
>    clock-names:
> -    items:
> +    oneOf:
>        - const: g1
>        - const: g2
> -      - const: bus
>  
>    power-domains:
>      maxItems: 1
>  
> +  nxp,imx8m-vpu-ctrl:
> +    description: Specifies a phandle to syscon VPU hardware control block
> +    $ref: "/schemas/types.yaml#/definitions/phandle"

This is optional?

> +
>  required:
>    - compatible
>    - reg
> @@ -60,20 +59,27 @@ additionalProperties: false
>  examples:
>    - |
>          #include <dt-bindings/clock/imx8mq-clock.h>
> +        #include <dt-bindings/power/imx8mq-power.h>
>          #include <dt-bindings/interrupt-controller/arm-gic.h>
>  
> -        vpu: video-codec@...00000 {
> +        vpu_g1: video-codec@...00000 {
>                  compatible = "nxp,imx8mq-vpu";
> -                reg = <0x38300000 0x10000>,
> -                      <0x38310000 0x10000>,
> -                      <0x38320000 0x10000>;
> -                reg-names = "g1", "g2", "ctrl";
> -                interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
> -                             <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> -                interrupt-names = "g1", "g2";
> -                clocks = <&clk IMX8MQ_CLK_VPU_G1_ROOT>,
> -                         <&clk IMX8MQ_CLK_VPU_G2_ROOT>,
> -                         <&clk IMX8MQ_CLK_VPU_DEC_ROOT>;
> -                clock-names = "g1", "g2", "bus";
> -                power-domains = <&pgc_vpu>;
> +                reg = <0x38300000 0x10000>;
> +                reg-names "g1";
> +                interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
> +                interrupt-names = "g1";
> +                clocks = <&clk IMX8MQ_CLK_VPU_G2_ROOT>;
> +                clock-names = "g1";
> +                power-domains = <&vpu_blk_ctrl IMX8MQ_VPUBLK_PD_G1>;
> +        };
> +
> +        vpu_g2: video-codec@...10000 {
> +                compatible = "nxp,imx8mq-vpu-g2";
> +                reg = <0x38300000 0x10000>;
> +                reg-names "g2";
> +                interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> +                interrupt-names = "g2";
> +                clocks = <&clk IMX8MQ_CLK_VPU_G2_ROOT>;
> +                clock-names = "g2";
> +                power-domains = <&vpu_blk_ctrl IMX8MQ_VPUBLK_PD_G2>;
>          };
> -- 
> 2.32.0
> 
>