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Wed, 4 Nov 2020 13:13:41 +0000 (GMT) Subject: Re: [PATCH] ARM: dts: exynos: Assign a fixed index to mmc devices on exynos4412 based ODROID boards To: Markus Reichl , Rob Herring , Kukjin Kim , Krzysztof Kozlowski Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org From: Marek Szyprowski Message-ID: Date: Wed, 4 Nov 2020 14:13:41 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <5800260a-5332-f627-eb36-32df4fbf05e3@fivetechno.de> Content-Transfer-Encoding: 8bit Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA02Sb0hTYRTGeXd3t+ty8no1fLV/cBVhQZpYMFIky3TgF/1QkFR21csU3ZRN Z/bFkZQ6Lcsi5xSWS2pKms1cZmRp5tLVJoolYkEo4RoauSw1V+16s/z2O+c873nOAy+BkWY8 jMhTFjMqJV1ACUR86/Cqc5+gzZS5/8UrSmoccuDSulk3JnU6u4RSy+xbXDrR1yyQ6p39PKlr aAVILz4dEh4mZNMz5TJLe7VA1t1aLvNYdqfxM0TxOUxBnoZRRSecFeXOGm140Xv/c6s/f2Ba MCLSAT8CwQNoxO0S6oCIIKEZIMP1JzhXfAPo9rM7Aq7wAGRsHRBuPnFXLfFYJuFdn8qVwYm+ ANQ+uYizgyCoRF0Nqxg7CIY3Aeq59npjLwYrARptntpYJYAxSLeg83kQhBgmoLmqUhb5MALp V7JZxXaYhbyedYxlMQxEI41zfJb9YCJ6+b1LwDIG96CKniaM4xA0PWfkcYdahejy+i6Ok9C9 +lqc4yD02fbwb5id6PdjVi/ycQVAHx0dQq6oBWjigh5wqjg041jbuBODEnS/L5prJyKvqVLI thEMQFMLgdwNAaje2oBxbTGqukRy6khksHX+sx0YG8euAsqwJZlhSxrDljSG/763AL8dhDAl aoWcUccqmdIoNa1QlyjlUdmFCgvw/R/7L9tyL+hfzxoEkACUv/i5tSWTxGmNukwxCBCBUcHi I2/sZ0hxDl12nlEVZqpKChj1INhB8KkQcazJdZqEcrqYyWeYIka1OeURfmFaoK2xNFJXPtCV N5Jj09uMxNoofjCVZx8Lx8n4cbHp1NGUyXAvdUzTDCW16WlyrfPEo0alxKiQaGZOnjQnzC+/ C3VDa83EUvZyvqguIiOVSEqJC/Uep8eqOxcPmR8k9w5/IrodfXrPwjZlpFDSYnco5l1f40xL TeEpHfFTFF+dS8fsxVRq+g/uiwQnOwMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrDIsWRmVeSWpSXmKPExsVy+t/xe7psKxfFG/xt57eYf+Qcq0X/49fM FufPb2C32PT4GqvF5V1z2CxmnN/HZPHyyA9Gi9a9R9gdODxu3an32LSqk81j85J6j8+b5AJY ovRsivJLS1IVMvKLS2yVog0tjPQMLS30jEws9QyNzWOtjEyV9O1sUlJzMstSi/TtEvQyHs8/ zlpwl6fi5+/vzA2MJ7m6GDk5JARMJF53fGLqYuTiEBJYyiixYs0aVoiEjMTJaQ1QtrDEn2td bBBFbxklVj5bzQ6SEBbIk/g39xgLSEJEYAqjxJmJzxlBHGaBdkaJO29nQ7X8ZpQ4f3oSG0gL m4ChRNdbkFkcHLwCdhJPOspBTBYBFYkZP5JBKkQFkiReXpjKBGLzCghKnJz5hAXE5hRwlDj6 bQPYFGYBM4l5mx8yQ9jyEs1bZ0PZ4hK3nsxnmsAoNAtJ+ywkLbOQtMxC0rKAkWUVo0hqaXFu em6xoV5xYm5xaV66XnJ+7iZGYMxtO/Zz8w7GSxuDDzEKcDAq8fAe2LYwXog1say4MvcQowQH s5IIr9PZ03FCvCmJlVWpRfnxRaU5qcWHGE2BfpvILCWanA9MB3kl8YamhuYWlobmxubGZhZK 4rwdAgdjhATSE0tSs1NTC1KLYPqYODilGhjNBItE57tJZ9xulpdWFXK8MKH89oHCNRLnOd6J 5ni4iiRUivkdV60xjZ/G/P7TySQ16Y/TvS/NTPWoSDBLdUg+fXLLOl8x9WeJ5lK7Ge4KHUrX qbHqnzKvZfFVdfM/DfePZ7tOMTLjSyv1ujOz3ub57Vmv9XQvz1s+/Wfl7bLn7PNv5u+TyFZi Kc5INNRiLipOBABGhyHUzwIAAA== X-CMS-MailID: 20201104131342eucas1p188d8ac778646ced5c594b1159e1a2410 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20201104102634eucas1p2ec7b705dd5092afa25d9877d1014f46a X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20201104102634eucas1p2ec7b705dd5092afa25d9877d1014f46a References: <20201104102558.11070-1-m.reichl@fivetechno.de> <5800260a-5332-f627-eb36-32df4fbf05e3@fivetechno.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Markus, 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 >>> --- >>>   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. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland