linux-kernel - Re: [PATCH 06/10] ARM: dts: Add MSHC0 dt node for eMMC device for exynos3250-artik5 module

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Date:	Mon, 14 Mar 2016 15:57:22 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>, kgene@...nel.org,
	s.nawrocki@...sung.com, tomasz.figa@...il.com
Cc:	jh80.chung@...sung.com, andi.shyti@...sung.com,
	inki.dae@...sung.com, sw0312.kim@...sung.com,
	pankaj.dubey@...sung.com, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 06/10] ARM: dts: Add MSHC0 dt node for eMMC device for
 exynos3250-artik5 module

On 14.03.2016 11:04, Chanwoo Choi wrote:
> From: Jaehoon Chung <jh80.chung@...sung.com>
> 
> This patch adds MSHC (Mobile Storage Host Controller) dt node for Exynos3250
> SoC. MSHC is an interface between the system and the eMMC device.
> 
> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
> Signed-off-by: Andi Shyti <andi.shyti@...sung.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  arch/arm/boot/dts/exynos3250-artik5.dtsi | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos3250-artik5.dtsi b/arch/arm/boot/dts/exynos3250-artik5.dtsi
> index 97d0087efb9f..75b291c10cdc 100644
> --- a/arch/arm/boot/dts/exynos3250-artik5.dtsi
> +++ b/arch/arm/boot/dts/exynos3250-artik5.dtsi
> @@ -277,6 +277,25 @@
>  	};
>  };
>  
> +&mshc_0 {
> +	num-slots = <1>;
> +	broken-cd;
> +	non-removable;

Broken or non-removable, not both.

> +	cap-mmc-highspeed;
> +	desc-num = <4>;
> +	card-detect-delay = <200>;
> +	vmmc-supply = <&ldo11_reg>;

Isn't this vqmmc-supply?

BTW, both MMC0 regulators (ldo11, ldo12) are marked as always-on. Why
they cannot be controlled by XMMC0CDN (just like on Rinato)?

What is the benefit of making this patch separate from "Add
exynos3250-artik5 dtsi file for ARTIK5 module"? Does the board boot
properly without this patch?

Best regards,
Krzysztof

> +	clock-frequency = <100000000>;
> +	clock-freq-min-max = <400000 100000000>;
> +	samsung,dw-mshc-ciu-div = <1>;
> +	samsung,dw-mshc-sdr-timing = <0 1>;
> +	samsung,dw-mshc-ddr-timing = <1 2>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&sd0_cmd &sd0_bus1 &sd0_bus4 &sd0_bus8>;
> +	bus-width = <8>;
> +	status = "okay";
> +};
> +
>  &xusbxti {
>  	clock-frequency = <24000000>;
>  };
>