linux-kernel - Re: [PATCH v2 2/2] arm64: dts: ti: k3-am62a7-sk: Enable eMMC support

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Date:   Tue, 28 Nov 2023 18:29:28 -0600
From:   Judith Mendez <jm@...com>
To:     Nitin Yadav <n-yadav@...com>, <devicetree@...r.kernel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh+dt@...nel.org>, <conor+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: ti: k3-am62a7-sk: Enable eMMC support

On 10/30/23 1:31 AM, Nitin Yadav wrote:
> Add support for 32GB eMMC card on AM62A7 SK. Includes adding mmc0
> pins settings. Add mmc0 alias for sdhci0 in k3-am62a7-sk.dts.
> 

This looks good to me. Although should it be explained why we are 
including pinmux for MMC0?

Reviewed-by: Judith Mendez <jm@...com>

> Signed-off-by: Nitin Yadav <n-yadav@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-am62a7-sk.dts | 25 +++++++++++++++++++++++++
>   1 file changed, 25 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
> index cff283c75f8e..c6f144d91734 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am62a7-sk.dts
> @@ -20,6 +20,7 @@ aliases {
>   		serial0 = &wkup_uart0;
>   		serial2 = &main_uart0;
>   		serial3 = &main_uart1;
> +		mmc0 = &sdhci0;
>   		mmc1 = &sdhci1;
>   	};
>   
> @@ -172,6 +173,22 @@ AM62AX_IOPAD(0x0b4, PIN_INPUT_PULLUP, 1) /* (K24) GPMC0_CSn3.I2C2_SDA */
>   		>;
>   	};
>   
> +	main_mmc0_pins_default: main-mmc0-default-pins {
> +		pinctrl-single,pins = <
> +			AM62AX_IOPAD(0x220, PIN_INPUT, 0) /* (Y3) MMC0_CMD */
> +			AM62AX_IOPAD(0x218, PIN_INPUT, 0) /* (AB1) MMC0_CLKLB */
> +			AM62AX_IOPAD(0x21c, PIN_INPUT, 0) /* (AB1) MMC0_CLK */
> +			AM62AX_IOPAD(0x214, PIN_INPUT, 0) /* (AA2) MMC0_DAT0 */
> +			AM62AX_IOPAD(0x210, PIN_INPUT_PULLUP, 0) /* (AA1) MMC0_DAT1 */
> +			AM62AX_IOPAD(0x20c, PIN_INPUT_PULLUP, 0) /* (AA3) MMC0_DAT2 */
> +			AM62AX_IOPAD(0x208, PIN_INPUT_PULLUP, 0) /* (Y4) MMC0_DAT3 */
> +			AM62AX_IOPAD(0x204, PIN_INPUT_PULLUP, 0) /* (AB2) MMC0_DAT4 */
> +			AM62AX_IOPAD(0x200, PIN_INPUT_PULLUP, 0) /* (AC1) MMC0_DAT5 */
> +			AM62AX_IOPAD(0x1fc, PIN_INPUT_PULLUP, 0) /* (AD2) MMC0_DAT6 */
> +			AM62AX_IOPAD(0x1f8, PIN_INPUT_PULLUP, 0) /* (AC2) MMC0_DAT7 */
> +		>;
> +	};
> +
>   	main_mmc1_pins_default: main-mmc1-default-pins {
>   		pinctrl-single,pins = <
>   			AM62AX_IOPAD(0x23c, PIN_INPUT, 0) /* (A21) MMC1_CMD */
> @@ -361,3 +378,11 @@ cpsw3g_phy0: ethernet-phy@0 {
>   		ti,min-output-impedance;
>   	};
>   };
> +
> +&sdhci0 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&main_mmc0_pins_default>;
> +	ti,driver-strength-ohm = <50>;
> +	disable-wp;
> +};