linux-kernel - Re: [PATCH] arm64: dts: rockchip: Assign a fixed index to mmc devices on rk3399-roc-pc boards.

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Date:   Wed, 04 Nov 2020 11:51:17 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     linux-rockchip@...ts.infradead.org,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Markus Reichl <m.reichl@...etechno.de>
Cc:     Markus Reichl <m.reichl@...etechno.de>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dianders@...omium.org
Subject: Re: [PATCH] arm64: dts: rockchip: Assign a fixed index to mmc devices on rk3399-roc-pc boards.

Hi Markus,

Am Mittwoch, 4. November 2020, 10:49:45 CET schrieb Markus Reichl:
> Recently introduced async probe on mmc devices can shuffle block IDs.
> Pin them to fixed values to ease booting in evironments where UUIDs
> are 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/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi
> index e7a459fa4322..bc9482b59428 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi
> @@ -13,6 +13,11 @@ / {
>  	model = "Firefly ROC-RK3399-PC Board";
>  	compatible = "firefly,roc-rk3399-pc", "rockchip,rk3399";
>  
> +	aliases {
> +		mmc0 = &sdmmc;
> +		mmc1 = &sdhci;
> +	};
> +

Any reason for this odering?

I.e. some previous incarnations had it ordered as (emmc, mmc, sdio).
This is also true for the ChromeOS out-of-tree usage of those, the
rk3399 dts in the chromeos-4.4 tree also orders this as sdhci, sdmmc, sdio.

And I guess a further question would be when we're doing arbitary orderings
anyway, why is this not in rk3399.dtsi ;-) ?


Heiko