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

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Date:   Fri, 26 Mar 2021 15:33:22 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     Philipp Zabel <pza@...gutronix.de>
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


Le 26/03/2021 à 15:24, Philipp Zabel a écrit :
> 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.

Yes I would do that.
The value comes from the datasheet.

>
>> +					       <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.

No because if only one device node is enabled we need to configure the both
clocks anyway.

Benjamin

>
> regards
> Philipp
>