linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845: Add gpi dma node

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Date:   Mon, 30 Nov 2020 21:20:03 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: sdm845: Add gpi dma node

On Mon 30 Nov 00:39 CST 2020, Vinod Koul wrote:

> This add the device node for gpi_dma0 and gpi_dma1 instances found in
> sdm845.
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 45 ++++++++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 6465a6653ad9..a6f41678794c 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -1114,6 +1114,28 @@ opp-128000000 {
>  			};
>  		};
>  
> +		gpi_dma0: dma-controller@...000 {
> +			#dma-cells = <3>;

I know you like dma, but may I have the compatible etc first in the
nodes? Perhaps move #dma-cells down by the other dma- properties?

> +			compatible = "qcom,sdm845-gpi-dma";
> +			reg = <0 0x00800000 0 0x60000>;
> +			interrupts = <GIC_SPI 244 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 246 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 247 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 248 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 249 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 250 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 251 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 252 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 253 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 254 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 255 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-channels = <13>;
> +			dma-channel-mask = <0xfa>;
> +			iommus = <&apps_smmu 0x0016 0x0>;
> +		};
> +
>  		qupv3_id_0: geniqup@...000 {
>  			compatible = "qcom,geni-se-qup";
>  			reg = <0 0x008c0000 0 0x6000>;
> @@ -1454,6 +1476,29 @@ uart7: serial@...000 {
>  			};
>  		};
>  
> +		gpi_dma1: dma-controller@...00000 {
> +			#dma-cells = <3>;
> +			compatible = "qcom,sdm845-gpi-dma";
> +			reg = <0 0x00a00000 0 0x60000>;
> +			interrupts = <GIC_SPI 279 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 280 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 281 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 282 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 284 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 293 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 294 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 295 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 296 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 297 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 298 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 299 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-channels = <13>;
> +			dma-channel-mask = <0xfa>;
> +			iommus = <&apps_smmu 0x06d6 0x0>;
> +			status = "disabled";

I don't think it's nice to keep gpi_dma0 enabled and gpi_dma1 disabled.
Either we do both enabled in sdm845.dtsi or we do both disabled and rely
on the boards to enable what they need.

Regards,
Bjorn

> +		};
> +
>  		qupv3_id_1: geniqup@...000 {
>  			compatible = "qcom,geni-se-qup";
>  			reg = <0 0x00ac0000 0 0x6000>;
> -- 
> 2.26.2
>