linux-kernel - Re: [PATCH 6/6] ARM: dts: qcom: sdx65-mtp: Enable PCIe EP

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Date:   Mon, 6 Mar 2023 11:32:05 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Rohit Agarwal <quic_rohiagar@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, lee@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, mani@...nel.org,
        lpieralisi@...nel.org, kw@...ux.com, bhelgaas@...gle.com,
        manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 6/6] ARM: dts: qcom: sdx65-mtp: Enable PCIe EP



On 6.03.2023 06:25, Rohit Agarwal wrote:
> Enable PCIe Endpoint controller on the SDX65 MTP board based
> on Qualcomm SDX65 platform.
> 
> Signed-off-by: Rohit Agarwal <quic_rohiagar@...cinc.com>
> ---
>  arch/arm/boot/dts/qcom-sdx65-mtp.dts | 46 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/qcom-sdx65-mtp.dts b/arch/arm/boot/dts/qcom-sdx65-mtp.dts
> index 86bb853..952de105 100644
> --- a/arch/arm/boot/dts/qcom-sdx65-mtp.dts
> +++ b/arch/arm/boot/dts/qcom-sdx65-mtp.dts
> @@ -252,6 +252,14 @@
>  	vdda-pll-supply = <&vreg_l4b_0p88>;
>  };
>  
> +&pcie_ep {
> +	status = "okay";
> +
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pcie_ep_clkreq_default &pcie_ep_perst_default
> +			&pcie_ep_wake_default>;
status last

pinctrl-n goes before pinctrl-names
> +};
> +
>  &qpic_bam {
>  	status = "okay";
>  };
> @@ -276,6 +284,44 @@
>  	memory-region = <&mpss_adsp_mem>;
>  };
>  
> ++&tlmm {
> +	pcie_ep_clkreq_default: pcie_ep_clkreq_default {
No underscores in node names, pinctrl children node names
must end in -state. Please check your patches against
"make dtbs_check"
> +		mux {
> +			pins = "gpio56";
> +			function = "pcie_clkreq";
> +		};
> +		config {
> +			pins = "gpio56";
> +			drive-strength = <2>;
> +			bias-disable;
> +		};
mux {} / config {} is unnecessary. You can simply do:

{
    pins = "gpio56";
    function = "pcie_clkreq";
    drive-strength = <2>;
    bias-disable;
};

Konrad
> +	};
> +
> +	pcie_ep_perst_default: pcie_ep_perst_default {
> +		mux {
> +			pins = "gpio57";
> +			function = "gpio";
> +		};
> +		config {
> +			pins = "gpio57";
> +			drive-strength = <2>;
> +			bias-pull-down;
> +		};
> +	};
> +
> +	pcie_ep_wake_default: pcie_ep_wake_default {
> +		mux {
> +			pins = "gpio53";
> +			function = "gpio";
> +		};
> +		config {
> +			pins = "gpio53";
> +			drive-strength = <2>;
> +			bias-disable;
> +		};
> +	};
> +};
> +
>  &usb {
>  	status = "okay";
>  };