linux-kernel - Re: [PATCH v6 13/13] arm64: dts: imx8mq: Add node to G2 hardware

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Message-ID: <20210326142440.GD8441@pengutronix.de>
Date:   Fri, 26 Mar 2021 15:24:40 +0100
From:   Philipp Zabel <pza@...gutronix.de>
To:     Benjamin Gaignard <benjamin.gaignard@...labora.com>
Cc:     ezequiel@...labora.com, mchehab@...nel.org, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        lee.jones@...aro.org, gregkh@...uxfoundation.org,
        mripard@...nel.org, paul.kocialkowski@...tlin.com, wens@...e.org,
        jernej.skrabec@...l.net, hverkuil-cisco@...all.nl,
        emil.l.velikov@...il.com, kernel@...gutronix.de, linux-imx@....com,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        kernel@...labora.com
Subject: Re: [PATCH v6 13/13] arm64: dts: imx8mq: Add node to G2 hardware

On Thu, Mar 18, 2021 at 09:20:46AM +0100, Benjamin Gaignard wrote:
> Split VPU node in two: one for G1 and one for G2 since they are
> different hardware blocks.
> Add syscon for hardware control block.
> Remove reg-names property that is useless.
> Each VPU node only need one interrupt.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
> ---
> version 5:
>  - use syscon instead of VPU reset
> 
>  arch/arm64/boot/dts/freescale/imx8mq.dtsi | 43 ++++++++++++++++++-----
>  1 file changed, 34 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> index 17c449e12c2e..b537d153ebbd 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> @@ -1329,15 +1329,16 @@ usb3_phy1: usb-phy@...f0040 {
>  			status = "disabled";
>  		};
>  
> -		vpu: video-codec@...00000 {
> +		vpu_ctrl: syscon@...20000 {
> +			compatible = "nxp,imx8mq-vpu-ctrl", "syscon";
> +			reg = <0x38320000 0x10000>;
> +		};
> +
> +		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";
> +			reg = <0x38300000 0x10000>;
> +			interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "g1";
>  			clocks = <&clk IMX8MQ_CLK_VPU_G1_ROOT>,
>  				 <&clk IMX8MQ_CLK_VPU_G2_ROOT>,
>  				 <&clk IMX8MQ_CLK_VPU_DEC_ROOT>;
> @@ -1350,9 +1351,33 @@ vpu: video-codec@...00000 {
>  						 <&clk IMX8MQ_VPU_PLL_OUT>,
>  						 <&clk IMX8MQ_SYS1_PLL_800M>,
>  						 <&clk IMX8MQ_VPU_PLL>;
> -			assigned-clock-rates = <600000000>, <600000000>,
> +			assigned-clock-rates = <600000000>, <300000000>,

I'd like to see this mentioned in the commit message.

> +					       <800000000>, <0>;
> +			power-domains = <&pgc_vpu>;
> +			nxp,imx8mq-vpu-ctrl = <&vpu_ctrl>;
> +		};
> +
> +		vpu_g2: video-codec@...10000 {
> +			compatible = "nxp,imx8mq-vpu-g2";
> +			reg = <0x38310000 0x10000>;
> +			interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>;
> +			interrupt-names = "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";
> +			assigned-clocks = <&clk IMX8MQ_CLK_VPU_G1>,

Can the G1 clock configuration be dropped from the G2 device node and
the G2 clock configuration from the G1 device node? It looks weird that
these devices configure each other's clocks.

regards
Philipp