linux-kernel - Re: [PATCH v2 2/2] arm64: dts: qcom: sm6125: Add GPI DMA nodes

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Message-ID: <f5496b92-ac1f-5920-1b3f-2bf0e710623b@linaro.org>
Date:   Sat, 17 Dec 2022 15:35:18 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Lux Aliaga <they@...t.lgbt>,
        Richard Acayan <mailingradian@...il.com>,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] arm64: dts: qcom: sm6125: Add GPI DMA nodes



On 17.12.2022 00:15, Marijn Suijten wrote:
> From: Martin Botka <martin.botka@...ainline.org>
> 
> Add nodes for GPI DMA hosts on SM6125.
> 
> Signed-off-by: Martin Botka <martin.botka@...ainline.org>
> [Marijn: reorder properties, use sdm845 fallback compatible, disable by
>  default, use 3 instead of 5 dma cells]
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
>  arch/arm64/boot/dts/qcom/sm6125.dtsi | 37 ++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm6125.dtsi b/arch/arm64/boot/dts/qcom/sm6125.dtsi
> index a205121ab4a7..abcd634c4f6d 100644
> --- a/arch/arm64/boot/dts/qcom/sm6125.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm6125.dtsi
> @@ -5,6 +5,7 @@
>  
>  #include <dt-bindings/clock/qcom,gcc-sm6125.h>
>  #include <dt-bindings/clock/qcom,rpmcc.h>
> +#include <dt-bindings/dma/qcom-gpi.h>
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/power/qcom-rpmpd.h>
> @@ -510,6 +511,42 @@ sdhc_2: mmc@...4000 {
>  			status = "disabled";
>  		};
>  
> +		gpi_dma0: dma-controller@...0000 {
> +			compatible = "qcom,sm6125-gpi-dma", "qcom,sdm845-gpi-dma";
> +			reg = <0x04a00000 0x60000>;
> +			interrupts = <GIC_SPI 335 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 336 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 337 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 338 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 339 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 340 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 341 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 342 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-channels = <8>;
> +			dma-channel-mask = <0x1f>;
> +			iommus = <&apps_smmu 0x0136 0x0>;
The stream id does not need the leading zero.
You made the mask a decimal zero in the previous patchset, please
decide on one convention. Masks are generally more useful as hex,
but for zero values I suppose zero is less noise for the same thing..

The DMA nodes however, look good otherwise.

Konrad
> +			#dma-cells = <3>;
> +			status = "disabled";
> +		};
> +
> +		gpi_dma1: dma-controller@...0000 {
> +			compatible = "qcom,sm6125-gpi-dma", "qcom,sdm845-gpi-dma";
> +			reg = <0x04c00000 0x60000>;
> +			interrupts = <GIC_SPI 314 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 315 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 316 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 317 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 318 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 319 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 320 IRQ_TYPE_LEVEL_HIGH>,
> +				     <GIC_SPI 321 IRQ_TYPE_LEVEL_HIGH>;
> +			dma-channels = <8>;
> +			dma-channel-mask = <0x0f>;
> +			iommus = <&apps_smmu 0x0156 0x0>;
> +			#dma-cells = <3>;
> +			status = "disabled";
> +		};
> +
>  		usb3: usb@...8800 {
>  			compatible = "qcom,sm6125-dwc3", "qcom,dwc3";
>  			reg = <0x04ef8800 0x400>;