Subject: [PATCH] ARM: tegra: beaver: allow SD card voltage to be changed

From: [email-masked] (Jon Hunter)
Date: Thu, 19 May 2016 15:31:31 +0100

On 29/02/16 21:01, Lucas Stach wrote:
> This allows to switch the card signal voltage level to 1.8V,
> which is needed for any ultra high speed modes to work.
> 
> Signed-off-by: Lucas Stach <[email-masked]>
> ---
> This needs the SDMMC memcomp pad calibration patches I just
> sent out to be applied, otherwise the card voltage change will
> fail with a message in the kernel log and a fall back to
> high speed operation.
> ---
>  arch/arm/boot/dts/tegra30-beaver.dts | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/tegra30-beaver.dts b/arch/arm/boot/dts/tegra30-beaver.dts
> index 1daed40..6b237f2 100644
> --- a/arch/arm/boot/dts/tegra30-beaver.dts
> +++ b/arch/arm/boot/dts/tegra30-beaver.dts
> @@ -1848,7 +1848,7 @@
>  
>  				ldo5_reg: ldo5 {
>  					regulator-name = "vddio_sdmmc,avdd_vdac";

Stephen, looking at the schematics, I don't see that this is connected
to the avdd_vdac (which appears to be unconnected) and so I am wondering
if this name should be just "vddio_sdmmc"?

> -					regulator-min-microvolt = <3300000>;
> +					regulator-min-microvolt = <1800000>;
>  					regulator-max-microvolt = <3300000>;
>  					regulator-always-on;
>  				};
> @@ -1919,6 +1919,7 @@
>  
>  	sdhci at 78000000 {
>  		status = "okay";
> +		vqmmc-supply = <&ldo5_reg>;
>  		cd-gpios = <&gpio TEGRA_GPIO(I, 5) GPIO_ACTIVE_LOW>;
>  		wp-gpios = <&gpio TEGRA_GPIO(T, 3) GPIO_ACTIVE_HIGH>;
>  		power-gpios = <&gpio TEGRA_GPIO(D, 7) GPIO_ACTIVE_HIGH>;
> 

Otherwise ...

Acked-by: Jon Hunter <[email-masked]>

Cheers
Jon

-- 
nvpublic