Re: [PATCH 1/1] arm64: dts: meson: g12b: odroid-n2: Assign a fixed index to mmc devices

Hi,

Am Freitag, 29. Januar 2021, 09:07:45 CET schrieb Neil Armstrong:

On 28/01/2021 00:08, Alexander Stein wrote:

quoted

Recently introduced async probe on mmc devices can shuffle block IDs.
Pin them to fixed values to ease booting in environments where UUIDs
are not practical. Use newly introduced aliases for mmcblk devices from 

[1].

quoted

[1]
https://patchwork.kernel.org/patch/11747669/

I understand the goal, and this should be done for _all_ boards, not only 

the Odroid-N2.

I see. So there are 2 options:
1.
Set the mapping for all 3 sd_emmc_* in the top-most .dtsi
Upside: very easy patch
Downside: When sd_emmc_a is not enabled "mmc0" will never be available.
Might be confusing.

2.
Set mapping only for enabled sd_emmc_* in the .dts[i] where it is enabled
Upside: Clean setup, only enabled sd_emmc_* have an alias
Downside: Much verbose patch(set)

Any preferences here? I honestly tend to 1. But this might break boards where
sd_emmc_a is not enabled, because the root device _will_ change in that case.

Best regards,
Alexander