linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sa8155p-adp: fix SDHC2 configuration

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Message-ID: <769a6a2a-2f38-42de-b3ce-8585b8b0a758@linaro.org>
Date: Thu, 11 Apr 2024 13:59:48 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Volodymyr Babchuk <Volodymyr_Babchuk@...m.com>
Cc: Stephan Gerhold <stephan@...hold.net>,
 "stable@...r.kernel.org" <stable@...r.kernel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Bhupesh Sharma <bhupesh.sharma@...aro.org>,
 "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: sa8155p-adp: fix SDHC2 configuration

On 11/04/2024 13:55, Volodymyr Babchuk wrote:
> There are multiple issues with SDHC2 configuration for SA8155P-ADP,
> which prevent use of SDHC2 and causes issues with ethernet:
> 
> - Card Detect pin for SHDC2 on SA8155P-ADP is connected to gpio4 of
>   PMM8155AU_1, not to SoC itself. SoC's gpio4 is used for DWMAC
>   TX. If sdhc driver probes after dwmac driver, it reconfigures
>   gpio4 and this breaks Ethernet MAC.
> 
> - pinctrl configuration mentions gpio96 as CD pin. It seems it was
>   copied from some SM8150 example, because as mentioned above,
>   correct CD pin is gpio4 on PMM8155AU_1.
> 
> - L13C voltage regulator limits minimal voltage to 2.504V, which
>   prevents use 1.8V to power SD card, which in turns does not allow
>   card to work in UHS mode.

That's not really related. One issue, one commit.

> 
> This patch fixes all the mentioned issues.
> 
> Fixes: 0deb2624e2d0 ("arm64: dts: qcom: sa8155p-adp: Add support for uSD card")
> Cc: stable@...r.kernel.org
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@...m.com>
> 
> ---
> 
> In v2:
>  - Added "Fixes:" tag
>  - CCed stable ML
>  - Fixed pinctrl configuration
>  - Extended voltage range for L13C voltage regulator
> ---
>  arch/arm64/boot/dts/qcom/sa8155p-adp.dts | 32 +++++++++++-------------
>  1 file changed, 14 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8155p-adp.dts b/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
> index 5e4287f8c8cd1..b9d56bda96759 100644
> --- a/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
> +++ b/arch/arm64/boot/dts/qcom/sa8155p-adp.dts
> @@ -283,7 +283,7 @@ vreg_l12c_1p808: ldo12 {
>  
>  		vreg_l13c_2p96: ldo13 {
>  			regulator-name = "vreg_l13c_2p96";
> -			regulator-min-microvolt = <2504000>;
> +			regulator-min-microvolt = <1800000>;
>  			regulator-max-microvolt = <2960000>;
>  			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>  		};
> @@ -384,10 +384,10 @@ &remoteproc_cdsp {
>  &sdhc_2 {
>  	status = "okay";
>  
> -	cd-gpios = <&tlmm 4 GPIO_ACTIVE_LOW>;
> +	cd-gpios = <&pmm8155au_1_gpios 4 GPIO_ACTIVE_LOW>;
>  	pinctrl-names = "default", "sleep";
> -	pinctrl-0 = <&sdc2_on>;
> -	pinctrl-1 = <&sdc2_off>;
> +	pinctrl-0 = <&sdc2_on &pmm8155au_1_sdc2_cd>;
> +	pinctrl-1 = <&sdc2_off &pmm8155au_1_sdc2_cd>;
>  	vqmmc-supply = <&vreg_l13c_2p96>; /* IO line power */
>  	vmmc-supply = <&vreg_l17a_2p96>;  /* Card power line */
>  	bus-width = <4>;
> @@ -505,13 +505,6 @@ data-pins {
>  			bias-pull-up;		/* pull up */
>  			drive-strength = <16>;	/* 16 MA */
>  		};
> -
> -		sd-cd-pins {
> -			pins = "gpio96";
> -			function = "gpio";
> -			bias-pull-up;		/* pull up */
> -			drive-strength = <2>;	/* 2 MA */
> -		};
>  	};
>  
>  	sdc2_off: sdc2-off-state {
> @@ -532,13 +525,6 @@ data-pins {
>  			bias-pull-up;		/* pull up */
>  			drive-strength = <2>;	/* 2 MA */
>  		};
> -
> -		sd-cd-pins {
> -			pins = "gpio96";
> -			function = "gpio";
> -			bias-pull-up;		/* pull up */
> -			drive-strength = <2>;	/* 2 MA */
> -		};
>  	};
>  
>  	usb2phy_ac_en1_default: usb2phy-ac-en1-default-state {
> @@ -604,3 +590,13 @@ phy-reset-pins {
>  		};
>  	};
>  };
> +
> +&pmm8155au_1_gpios {
> +	pmm8155au_1_sdc2_cd: pmm8155au_1-sdc2-cd {

No underscores in node names.

Please also follow tlmm style of naming nodes.

Also does not look like node is placed in alphabetical place. Where did
you put it?

Best regards,
Krzysztof