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Date: Thu, 5 Nov 2020 09:31:51 +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, on rk3399 the proposed ordering [1] is according to base address in DT. [1] https://patchwork.kernel.org/patch/11881427 Am 04.11.20 um 14:44 schrieb Marek Szyprowski: > On 04.11.2020 14:13, Marek Szyprowski wrote: >> On 04.11.2020 14:06, Markus Reichl wrote: >>> Am 04.11.20 um 13:25 schrieb Marek Szyprowski: >>>> 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). >>> How to deal then with sdhci_0 (from exynos4.dtsi) vc. mshc_0 (from >>> exynos4412.dts)? >> sdhci_0 and mshc_0 both operate on the same physical MMC0 bus, so this >> is not an issue. They cannot be used simultaneously. The latter is just >> faster, the first one has been left there mainly for the software >> compatibility. > > I've thought a bit more on this and I would simply prefer to add generic > MMC aliases to the top-level Exynos dtsi files (3250, 4210, 4412, 5250, > 5410, 5420) to keep Linux logical MMC bus numbers in sync with the HW > bus numbers on all boards. > > Best regards > Gruß, -- Markus Reichl Download attachment "OpenPGP_0x3A25DE0E6B1AFDB2.asc" of type "application/pgp-keys" (3006 bytes) Download attachment "OpenPGP_signature" of type "application/pgp-signature" (666 bytes)
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