linux-kernel - Re: [PATCH v2 2/3] arm64: dts: qcom: sm8250: Add SDHCI2 pinctrl

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Date:   Tue, 15 Jun 2021 18:39:39 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, martin.botka@...ainline.org,
        angelogioacchino.delregno@...ainline.org,
        marijn.suijten@...ainline.org, jamipkettunen@...ainline.org,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] arm64: dts: qcom: sm8250: Add SDHCI2 pinctrl

On Sat 12 Jun 14:23 CDT 2021, Konrad Dybcio wrote:

> Add required pins for SDHCI2, so that the interface can work reliably.
> The configuration comes from a MTP board, which conveniently means it's
> going to be correct for the vast majority of phones (and other devices).
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
> ---
> Changes since v1:
> - Separate this into its own patch
> 
>  arch/arm64/boot/dts/qcom/sm8250.dtsi | 32 ++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> index fc1049c2bb11..fe858abbff5d 100644
> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> @@ -8,6 +8,7 @@
>  #include <dt-bindings/clock/qcom,gcc-sm8250.h>
>  #include <dt-bindings/clock/qcom,gpucc-sm8250.h>
>  #include <dt-bindings/clock/qcom,rpmh.h>
> +#include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/interconnect/qcom,osm-l3.h>
>  #include <dt-bindings/interconnect/qcom,sm8250.h>
>  #include <dt-bindings/mailbox/qcom-ipcc.h>
> @@ -2157,6 +2158,10 @@ sdhc_2: sdhci@...4000 {
>  			power-domains = <&rpmhpd SM8250_CX>;
>  			operating-points-v2 = <&sdhc2_opp_table>;
>  
> +			cd-gpios = <&tlmm 77 GPIO_ACTIVE_HIGH>;
> +			pinctrl-0 = <&sdc2_default_state &sdc2_card_det_n>;
> +			pinctrl-names = "default";
> +
>  			status = "disabled";
>  
>  			sdhc2_opp_table: sdhc2-opp-table {
> @@ -3401,6 +3406,33 @@ ws {
>  					output-high;
>  				};
>  			};
> +
> +			sdc2_default_state: sdc2-default {
> +				clk {
> +					pins = "sdc2_clk";
> +					drive-strength = <16>;

The fact that RB5 has these as 16/10/10 seems to show that these should
be board-specific (as we typically have them). So please follow that.


(The sleep state on other hand is not going to change, so that I'm okay
with you define here for all boards to use).

Regards,
Bjorn

> +					bias-disable;
> +				};
> +
> +				cmd {
> +					pins = "sdc2_cmd";
> +					drive-strength = <16>;
> +					bias-pull-up;
> +				};
> +
> +				data {
> +					pins = "sdc2_data";
> +					drive-strength = <16>;
> +					bias-pull-up;
> +				};
> +			};
> +
> +			sdc2_card_det_n: sd-card-det-n {
> +				pins = "gpio77";
> +				function = "gpio";
> +				bias-pull-up;
> +				drive-strength = <2>;
> +			};
>  		};
>  
>  		apps_smmu: iommu@...00000 {
> -- 
> 2.32.0
>