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 13:43:28 +0100
From:   Markus Reichl <m.reichl@...etechno.de>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        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 Marek,

Am 04.11.20 um 13:25 schrieb Marek Szyprowski:
> 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).

This would break present and long standing  boot ordering in mainline, which is
mmcblk0 = SD-card and
mmcblk1 = eMMC

Still desired?

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

Gruß,
-- 
Markus Reichl