linux-kernel - Re: [PATCH 1/8] arm64: dts: imx8mm-kontron: Add support for ultra high speed modes on SD card

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Date:   Fri, 15 Oct 2021 12:44:35 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     Shawn Guo <shawnguo@...nel.org>, Frieder Schrempf <frieder@...s.de>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH 1/8] arm64: dts: imx8mm-kontron: Add support for ultra
 high speed modes on SD card

On 05.10.21 08:45, Shawn Guo wrote:
> On Thu, Sep 30, 2021 at 05:56:24PM +0200, Frieder Schrempf wrote:
>> From: Frieder Schrempf <frieder.schrempf@...tron.de>
>>
>> In order to use ultra high speed modes (UHS) on the SD card slot, we
>> add matching pinctrls and fix the voltage switching for LDO5 of the
>> PMIC, by providing the SD_VSEL pin as GPIO to the PMIC driver.
>>
>> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
>> ---
>>  .../dts/freescale/imx8mm-kontron-n801x-s.dts  | 28 ++++++++++++++++++-
>>  .../freescale/imx8mm-kontron-n801x-som.dtsi   |  2 ++
>>  2 files changed, 29 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
>> index d17abb515835..62ba3bd08a0c 100644
>> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
>> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-s.dts
>> @@ -189,8 +189,10 @@ usbnet: usbether@1 {
>>  };
>>  
>>  &usdhc2 {
>> -	pinctrl-names = "default";
>> +	pinctrl-names = "default", "state_100mhz", "state_200mhz";
>>  	pinctrl-0 = <&pinctrl_usdhc2>;
>> +	pinctrl-1 = <&pinctrl_usdhc2_100mhz>;
>> +	pinctrl-2 = <&pinctrl_usdhc2_200mhz>;
>>  	vmmc-supply = <&reg_vdd_3v3>;
>>  	vqmmc-supply = <&reg_nvcc_sd>;
>>  	cd-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
>> @@ -319,4 +321,28 @@ MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d0
>>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
>>  		>;
>>  	};
>> +
>> +	pinctrl_usdhc2_100mhz: usdhc2grp100mhz {
> 
> Did you run dtbs_check on it?

Thanks for the reminder. I ran the check now and will fix up the node
names in v2.

> 
>> +		fsl,pins = <
>> +			MX8MM_IOMUXC_SD2_CLK_USDHC2_CLK			0x194
>> +			MX8MM_IOMUXC_SD2_CMD_USDHC2_CMD			0x1d4
>> +			MX8MM_IOMUXC_SD2_DATA0_USDHC2_DATA0		0x1d4
>> +			MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d4
>> +			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d4
>> +			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4
>> +			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
>> +		>;
>> +	};
>> +
>> +	pinctrl_usdhc2_200mhz: usdhc2grp200mhz {
>> +		fsl,pins = <
>> +			MX8MM_IOMUXC_SD2_CLK_USDHC2_CLK			0x196
>> +			MX8MM_IOMUXC_SD2_CMD_USDHC2_CMD			0x1d6
>> +			MX8MM_IOMUXC_SD2_DATA0_USDHC2_DATA0		0x1d6
>> +			MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d6
>> +			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d6
>> +			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d6
>> +			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
>> +		>;
>> +	};
>>  };
>> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
>> index d0456daefda8..03b3516abd64 100644
>> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
>> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
>> @@ -86,6 +86,7 @@ pca9450: pmic@25 {
>>  		pinctrl-0 = <&pinctrl_pmic>;
>>  		interrupt-parent = <&gpio1>;
>>  		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
>> +		sd-vsel-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
>>  
>>  		regulators {
>>  			reg_vdd_soc: BUCK1 {
>> @@ -225,6 +226,7 @@ MX8MM_IOMUXC_I2C1_SDA_I2C1_SDA			0x400001c3
>>  	pinctrl_pmic: pmicgrp {
>>  		fsl,pins = <
>>  			MX8MM_IOMUXC_GPIO1_IO00_GPIO1_IO0		0x141
>> +			MX8MM_IOMUXC_GPIO1_IO04_GPIO1_IO4		0x141
>>  		>;
>>  	};
>>  
>> -- 
>> 2.33.0
>>