linux-kernel - Re: [PATCH v4 11/11] arm: dts: qcom: mdm9615: remove useless amba subnode

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Message-ID: <8443ca29-ea0f-f209-e3f6-20eca969ea7c@somainline.org>
Date:   Fri, 21 Oct 2022 11:16:20 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Satya Priya <quic_c_skakit@...cinc.com>,
        Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Andy Gross <agross@...nel.org>,
        Alessandro Zummo <a.zummo@...ertech.it>
Cc:     linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org, Rob Herring <robh@...nel.org>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 11/11] arm: dts: qcom: mdm9615: remove useless amba
 subnode



On 21.10.2022 11:06, Neil Armstrong wrote:
> The separate amba device node doesn't add anything significant to the
> DT. The OF parsing code already creates amba_device or platform_device
> depending on the compatibility lists.
> 
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
If we ever wanted to do split buses, per-NoC nodes would make sense, but
as you mentioned, this does not, really.

Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Konrad
>  arch/arm/boot/dts/qcom-mdm9615.dtsi | 78 +++++++++++++++++--------------------
>  1 file changed, 36 insertions(+), 42 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/qcom-mdm9615.dtsi b/arch/arm/boot/dts/qcom-mdm9615.dtsi
> index 9d950f96280d..482fd246321c 100644
> --- a/arch/arm/boot/dts/qcom-mdm9615.dtsi
> +++ b/arch/arm/boot/dts/qcom-mdm9615.dtsi
> @@ -314,49 +314,43 @@ sdcc2bam: dma-controller@...42000{
>  			qcom,ee = <0>;
>  		};
>  
> -		amba {
> -			compatible = "simple-bus";
> -			#address-cells = <1>;
> -			#size-cells = <1>;
> -			ranges;
> -			sdcc1: mmc@...80000 {
> -				status = "disabled";
> -				compatible = "arm,pl18x", "arm,primecell";
> -				arm,primecell-periphid = <0x00051180>;
> -				reg = <0x12180000 0x2000>;
> -				interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
> -				clocks = <&gcc SDC1_CLK>, <&gcc SDC1_H_CLK>;
> -				clock-names = "mclk", "apb_pclk";
> -				bus-width = <8>;
> -				max-frequency = <48000000>;
> -				cap-sd-highspeed;
> -				cap-mmc-highspeed;
> -				vmmc-supply = <&vsdcc_fixed>;
> -				dmas = <&sdcc1bam 2>, <&sdcc1bam 1>;
> -				dma-names = "tx", "rx";
> -				assigned-clocks = <&gcc SDC1_CLK>;
> -				assigned-clock-rates = <400000>;
> -			};
> +		sdcc1: mmc@...80000 {
> +			status = "disabled";
> +			compatible = "arm,pl18x", "arm,primecell";
> +			arm,primecell-periphid = <0x00051180>;
> +			reg = <0x12180000 0x2000>;
> +			interrupts = <GIC_SPI 104 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&gcc SDC1_CLK>, <&gcc SDC1_H_CLK>;
> +			clock-names = "mclk", "apb_pclk";
> +			bus-width = <8>;
> +			max-frequency = <48000000>;
> +			cap-sd-highspeed;
> +			cap-mmc-highspeed;
> +			vmmc-supply = <&vsdcc_fixed>;
> +			dmas = <&sdcc1bam 2>, <&sdcc1bam 1>;
> +			dma-names = "tx", "rx";
> +			assigned-clocks = <&gcc SDC1_CLK>;
> +			assigned-clock-rates = <400000>;
> +		};
>  
> -			sdcc2: mmc@...40000 {
> -				compatible = "arm,pl18x", "arm,primecell";
> -				arm,primecell-periphid = <0x00051180>;
> -				status = "disabled";
> -				reg = <0x12140000 0x2000>;
> -				interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
> -				clocks = <&gcc SDC2_CLK>, <&gcc SDC2_H_CLK>;
> -				clock-names = "mclk", "apb_pclk";
> -				bus-width = <4>;
> -				cap-sd-highspeed;
> -				cap-mmc-highspeed;
> -				max-frequency = <48000000>;
> -				no-1-8-v;
> -				vmmc-supply = <&vsdcc_fixed>;
> -				dmas = <&sdcc2bam 2>, <&sdcc2bam 1>;
> -				dma-names = "tx", "rx";
> -				assigned-clocks = <&gcc SDC2_CLK>;
> -				assigned-clock-rates = <400000>;
> -			};
> +		sdcc2: mmc@...40000 {
> +			compatible = "arm,pl18x", "arm,primecell";
> +			arm,primecell-periphid = <0x00051180>;
> +			status = "disabled";
> +			reg = <0x12140000 0x2000>;
> +			interrupts = <GIC_SPI 103 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&gcc SDC2_CLK>, <&gcc SDC2_H_CLK>;
> +			clock-names = "mclk", "apb_pclk";
> +			bus-width = <4>;
> +			cap-sd-highspeed;
> +			cap-mmc-highspeed;
> +			max-frequency = <48000000>;
> +			no-1-8-v;
> +			vmmc-supply = <&vsdcc_fixed>;
> +			dmas = <&sdcc2bam 2>, <&sdcc2bam 1>;
> +			dma-names = "tx", "rx";
> +			assigned-clocks = <&gcc SDC2_CLK>;
> +			assigned-clock-rates = <400000>;
>  		};
>  
>  		tcsr: syscon@...00000 {
>