linux-kernel - Re: [PATCH V9 4/8] arm64: dts: sc7280: Add QUPv3 wrapper

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Date:   Tue, 21 Sep 2021 11:17:51 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rajesh Patil <rajpat@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, rnayak@...eaurora.org,
        saiprakash.ranjan@...eaurora.org, msavaliy@....qualcomm.com,
        skakit@...eaurora.org, mka@...omium.org, dianders@...omium.org,
        Roja Rani Yarubandi <rojay@...eaurora.org>
Subject: Re: [PATCH V9 4/8] arm64: dts: sc7280: Add QUPv3 wrapper_0 nodes

Quoting Rajesh Patil (2021-09-21 03:39:02)
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 2fbcb0a..b65c5da 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -536,24 +555,425 @@
>                 qupv3_id_0: geniqup@...000 {
>                         compatible = "qcom,geni-se-qup";
>                         reg = <0 0x009c0000 0 0x2000>;
> -                       clock-names = "m-ahb", "s-ahb";
>                         clocks = <&gcc GCC_QUPV3_WRAP_0_M_AHB_CLK>,
>                                  <&gcc GCC_QUPV3_WRAP_0_S_AHB_CLK>;
> +                       clock-names = "m-ahb", "s-ahb";
>                         #address-cells = <2>;
>                         #size-cells = <2>;
>                         ranges;
> +                       iommus = <&apps_smmu 0x123 0x0>;
>                         status = "disabled";
>
> +                       i2c0: i2c@...000 {
> +                               compatible = "qcom,geni-i2c";
> +                               reg = <0 0x00980000 0 0x4000>;
> +                               clocks = <&gcc GCC_QUPV3_WRAP0_S0_CLK>;
> +                               clock-names = "se";
> +                               pinctrl-names = "default";
> +                               pinctrl-0 = <&qup_i2c0_data_clk>;
> +                               interrupts = <GIC_SPI 601 IRQ_TYPE_LEVEL_HIGH>;
> +                               #address-cells = <1>;
> +                               #size-cells = <0>;
> +                               interconnects = <&clk_virt MASTER_QUP_CORE_0 0 &clk_virt SLAVE_QUP_CORE_0 0>,
> +                                               <&gem_noc MASTER_APPSS_PROC 0 &cnoc2 SLAVE_QUP_0 0>,
> +                                               <&aggre1_noc MASTER_QUP_0 0 &mc_virt SLAVE_EBI1 0>;
> +                               interconnect-names = "qup-core", "qup-config",
> +                                                       "qup-memory";
> +                               status = "disabled";
> +                       };
> +
> +                       spi0: spi@...000 {
> +                               compatible = "qcom,geni-spi";
> +                               reg = <0 0x00980000 0 0x4000>;
> +                               clocks = <&gcc GCC_QUPV3_WRAP0_S0_CLK>;
> +                               clock-names = "se";
> +                               pinctrl-names = "default";
> +                               pinctrl-0 = <&qup_spi0_data_clk>, <&qup_spi0_cs>, <&qup_spi0_cs_gpio>;

This should only have qup_spi0_data_clk and qup_spi0_cs, not
qup_spi0_cs_gpio. Both qup controlled and gpio controlled options are
provided in case a board wants to use the qup version of chipselect, but
having them both used by default leads to conflicts and confusion. This
same comment applies to all spi pinctrl properties in this file. Please
keep the cs_gpio variants though so that boards can use them if they
want. They will be unused, but that's OK.

> +                               interrupts = <GIC_SPI 601 IRQ_TYPE_LEVEL_HIGH>;
> +                               #address-cells = <1>;
> +                               #size-cells = <0>;
> +                               power-domains = <&rpmhpd SC7280_CX>;
> +                               operating-points-v2 = <&qup_opp_table>;
> +                               interconnects = <&clk_virt MASTER_QUP_CORE_0 0 &clk_virt SLAVE_QUP_CORE_0 0>,
> +                                               <&gem_noc MASTER_APPSS_PROC 0 &cnoc2 SLAVE_QUP_0 0>;
> +                               interconnect-names = "qup-core", "qup-config";
> +                               status = "disabled";
> +                       };
> +