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Tue, 7 Sep 2021 11:53:16 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Tue, 7 Sep 2021 11:53:16 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 187GrGAA119325; Tue, 7 Sep 2021 11:53:16 -0500 Date: Tue, 7 Sep 2021 11:53:16 -0500 From: Nishanth Menon To: Aswath Govindraju CC: Jan Kiszka , Tero Kristo , Rob Herring , , , , Bao Cheng Su , Chao Zeng Subject: Re: [PATCH 1/3] arm64: dts: ti: iot2050: Flip mmc device ordering on Advanced devices Message-ID: <20210907165316.4s3jrouctcpc3kvo@pessimism> References: <8e2e435ef67868cb98382b44c51ddb5c8d045d66.1631024536.git.jan.kiszka@siemens.com> <20210907151301.7fqwmc7hmcyhhybv@carve> <35e0cadf-526c-6402-fb8e-8cdb8b7a0bfe@siemens.com> <20210907152746.fbddtkktvx6hb5ti@cattishly> <20210907153547.53cc2zx23rx72kqf@thyself> <482dddc1-b1f8-15db-a0c5-0d6def5d859f@ti.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <482dddc1-b1f8-15db-a0c5-0d6def5d859f@ti.com> User-Agent: NeoMutt/20171215 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210907_095318_638210_E294380F X-CRM114-Status: GOOD ( 33.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 22:17-20210907, Aswath Govindraju wrote: > Hi Nishanth, > > On 07/09/21 9:05 pm, Nishanth Menon wrote: > > On 17:30-20210907, Jan Kiszka wrote: > >> On 07.09.21 17:27, Nishanth Menon wrote: > >>> On 17:20-20210907, Jan Kiszka wrote: > >>>> On 07.09.21 17:13, Nishanth Menon wrote: > >>>>> On 16:22-20210907, Jan Kiszka wrote: > >>>>>> From: Jan Kiszka > >>>>>> > >>>>>> This ensures that the SD card will remain mmc0 across Basic and Advanced > >>>>>> devices, also avoiding surprises for users coming from the downstream > >>>>>> kernels. > >>>>>> > >>>>>> Signed-off-by: Jan Kiszka > >>>>>> --- > >>>>>> arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts | 5 +++++ > >>>>>> 1 file changed, 5 insertions(+) > >>>>>> > >>>>>> diff --git a/arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts b/arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts > >>>>>> index ec9617c13cdb..d1d5278e0b94 100644 > >>>>>> --- a/arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts > >>>>>> +++ b/arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dts > >>>>>> @@ -18,6 +18,11 @@ / { > >>>>>> compatible = "siemens,iot2050-advanced", "ti,am654"; > >>>>>> model = "SIMATIC IOT2050 Advanced"; > >>>>>> > >>>>>> + aliases { > >>>>>> + mmc0 = &sdhci1; > >>>>>> + mmc1 = &sdhci0; > >>>>>> + }; > >>>>> > >>>>> > >>>>> Should we do this at SoC level? > >>>>> > >>>> > >>>> Well, I wouldn't mind - but that would also impact your EVMs. For us, > >>>> this is fine as we are coming from that ordering above with our > >>>> downstream kernel/dts. > >>>> > >>> > >>> I think it'd probably be a welcome change. overall we've standardized on > >>> partuuid. > >>> > >> > >> Yeah, it's more about "dd if=emmc.img of=/dev/mmcblk1 - damn, the wrong > >> one again." > >> > >> Let me know what you prefer, and I'll update my patch. > > > > > > Lets do it at SoC level. I will follow it up with a patch for other K3 > > SoCs as well. > > > > > > Unless someone has a strong opinion on this approach - if so, speak up > > with reasons. > > > > Making this change in SoC level for all K3 devices would force changes > to be made in U-Boot too, for consistency. In U-Boot, a major change > would be required in the environment variables to support this. As I > don't see any functional advantage by making this change, I feel that > this change would make things more confusing for users already using the > K3 devices. At present, the ordering is consistent across all the K3 > devices, I feel that keeping it the same way would be better. > > As for making changes only on IoT boards, if it is okay to have the > ordering changed between U-Boot and kernel, I don't see any problem > making this change in kernel alone. arch/arm64/boot/dts/ti/k3-am65.dtsi has no ordering. u-boot is supposed to copy from kernel the dtsi files as is. I think having mmc aliases in kernel is a good thing as we do regard kernel as the canonical dts source. If you are suggesting we flip things so that mmc0 is sdhci0 and mmc1 is sdhci1 - that might be a valid suggestion - Jan, do you see a problem in having consistency here (flip the aliases)? -- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel