linux-kernel - Re: [PATCH v1] arm64: dts: ti: verdin-am62: use SD1 CD as GPIO

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Date: Tue, 19 Mar 2024 07:07:17 -0500
From: Nishanth Menon <nm@...com>
To: Francesco Dolcini <francesco@...cini.it>
CC: Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        João Paulo Silva Gonçalves <joao.goncalves@...adex.com>
Subject: Re: [PATCH v1] arm64: dts: ti: verdin-am62: use SD1 CD as GPIO

On 15:49-20240312, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@...adex.com>
> 
> TI SDHCI IP has a hardware debounce timer of 1 second as described in
> commit 7ca0f166f5b2 ("mmc: sdhci_am654: Add workaround for card detect
> debounce timer"), because of this the boot time increases of up to 1
> second.
> 
> Workaround the issue the same way that is done on
> arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts, using the SD1 CD as
> GPIO.
> 
> Suggested-by: Nishanth Menon <nm@...com>
> Reported-by: João Paulo Silva Gonçalves <joao.goncalves@...adex.com>
> Closes: https://lore.kernel.org/all/0e81af80de3d55e72f79af83fa5db87f5c9938f8.camel@toradex.com/
> Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> ---
>  arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> index e8d8857ad51f..a9bf2c17f95a 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-verdin.dtsi
> @@ -457,6 +457,13 @@ AM62X_IOPAD(0x01c4, PIN_INPUT, 7) /* (B14) SPI0_D1.GPIO1_19 */ /* SODIMM 161 */
>  		>;
>  	};
>  
> +	/* Verdin SD_1_CD# as GPIO */
> +	pinctrl_sd1_cd_gpio: main-gpio1-48-default-pins {
> +		pinctrl-single,pins = <
> +			AM62X_IOPAD(0x240, PIN_INPUT_PULLUP, 7) /* (D17) MMC1_SDCD.GPIO1_48 */ /* SODIMM 84 */
> +		>;
> +	};
> +
>  	/* Verdin DSI_1_INT# (pulled-up as active-low) */
>  	pinctrl_dsi1_int: main-gpio1-49-default-pins {
>  		pinctrl-single,pins = <
> @@ -571,7 +578,6 @@ AM62X_IOPAD(0x230, PIN_INPUT,        0) /* (A22) MMC1_DAT0 */ /* SODIMM 80 */
>  			AM62X_IOPAD(0x22c, PIN_INPUT,        0) /* (B21) MMC1_DAT1 */ /* SODIMM 82 */
>  			AM62X_IOPAD(0x228, PIN_INPUT,        0) /* (C21) MMC1_DAT2 */ /* SODIMM 70 */
>  			AM62X_IOPAD(0x224, PIN_INPUT,        0) /* (D22) MMC1_DAT3 */ /* SODIMM 72 */
> -			AM62X_IOPAD(0x240, PIN_INPUT_PULLUP, 0) /* (D17) MMC1_SDCD */ /* SODIMM 84 */
>  		>;
>  	};
>  
> @@ -1441,8 +1447,10 @@ &sdhci0 {
>  /* Verdin SD_1 */
>  &sdhci1 {
>  	pinctrl-names = "default";
> -	pinctrl-0 = <&pinctrl_sdhci1>;
> +	pinctrl-0 = <&pinctrl_sdhci1>, <&pinctrl_sd1_cd_gpio>;
> +	cd-gpios = <&main_gpio1 48 GPIO_ACTIVE_LOW>;
>  	disable-wp;
> +	ti,fails-without-test-cd;
>  	vmmc-supply = <&reg_sdhc1_vmmc>;
>  	vqmmc-supply = <&reg_sdhc1_vqmmc>;
>  	status = "disabled";

Minor style comment based on recently added https://docs.kernel.org/devicetree/bindings/dts-coding-style.html#order-of-properties-in-device-node

ti,fails-without-test-cd comes after vqmmc-supply and above status.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D