linux-kernel - Re: [PATCH] ARM: dts: exynos: Assign a fixed index to mmc devices on exynos4412 based ODROID boards

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Date:   Wed, 4 Nov 2020 13:25:40 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Markus Reichl <m.reichl@...etechno.de>,
        Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: exynos: Assign a fixed index to mmc devices
 on exynos4412 based ODROID boards

Hi Markus,

On 04.11.2020 11:25, Markus Reichl wrote:
> Recently introduced async probe on mmc devices can shuffle block IDs.
> Pin them to fixed values to ease booting in evironments where UUIDs ar not practical.
> Use newly introduced aliases for mmcblk devices from [1].
>
> [1]
> https://patchwork.kernel.org/patch/11747669/
>
> Signed-off-by: Markus Reichl <m.reichl@...etechno.de>
> ---
>   arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> index a5c1ce1e396c..aa10d5bc7e1c 100644
> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> @@ -13,6 +13,11 @@
>   #include "exynos-mfc-reserved-memory.dtsi"
>   
>   / {
> +	aliases {
> +		mmc0 = &sdhci_2;
> +		mmc1 = &mshc_0;

Like in the OdroidXU3-family patch, I would use 0 for the eMMC (mshc_0) 
and 2 for the SD-card (sdhci_2).

> +	};
> +
>   	chosen {
>   		stdout-path = &serial_1;
>   	};

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland