linux-kernel - Re: [PATCH RFC 09/15] ARM: dts: sun6i: sina31s: Switch to mmc3 for onboard eMMC

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Date:	Thu, 21 Jan 2016 12:16:53 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Chen-Yu Tsai <wens@...e.org>, Ulf Hansson <ulf.hansson@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH RFC 09/15] ARM: dts: sun6i: sina31s: Switch to mmc3 for
 onboard eMMC

Hi,

On 21-01-16 06:26, Chen-Yu Tsai wrote:
> According to Allwinner, only mmc3 supports 8 bit DDR transfers for eMMC.
> Switch to mmc3 for the onboard eMMC, and also assign vqmmc for signal
> voltage sensing/switching, and "cap-mmc-hw-reset" to denote this
> instance can use eMMC hardware reset.

This is going to need some more explanation, does this mean
that the old dtsi is wrong and the emmc does not work there are all ?

Regards,

Hans


>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>   arch/arm/boot/dts/sun6i-a31s-sina31s-core.dtsi | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/sun6i-a31s-sina31s-core.dtsi b/arch/arm/boot/dts/sun6i-a31s-sina31s-core.dtsi
> index ea69fb8ad4d8..4ec0c8679b2e 100644
> --- a/arch/arm/boot/dts/sun6i-a31s-sina31s-core.dtsi
> +++ b/arch/arm/boot/dts/sun6i-a31s-sina31s-core.dtsi
> @@ -61,12 +61,14 @@
>   };
>
>   /* eMMC on core board */
> -&mmc2 {
> +&mmc3 {
>   	pinctrl-names = "default";
> -	pinctrl-0 = <&mmc2_8bit_emmc_pins>;
> +	pinctrl-0 = <&mmc3_8bit_emmc_pins>;
>   	vmmc-supply = <&reg_dcdc1>;
> +	vqmmc-supply = <&reg_dcdc1>;
>   	bus-width = <8>;
>   	non-removable;
> +	cap-mmc-hw-reset;
>   	status = "okay";
>   };
>
>