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Petersen" , Manivannan Sadhasivam , Shawn Lin Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20260119-ufs-rst-v1-1-c8e96493948c@gmail.com> <6479d7b8-7712-4181-9c82-0021da94d1a8@rock-chips.com> <5743823.mogB4TqSGs@phil> Content-Language: en-US From: Quentin Schulz In-Reply-To: <5743823.mogB4TqSGs@phil> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: FR0P281CA0188.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:ab::9) To GVXPR04MB12038.eurprd04.prod.outlook.com (2603:10a6:150:2be::5) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: GVXPR04MB12038:EE_|DBBPR04MB7561:EE_ X-MS-Office365-Filtering-Correlation-Id: 282caf19-a31e-444e-07c7-08de580db2e8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|10070799003|1800799024|14052099004; 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Januar 2026, 02:39:28 Mitteleuropäische Normalzeit schrieb Shawn Lin: >> 在 2026/01/19 星期一 17:22, Alexey Charkov 写道: >>> Rockchip RK3576 UFS controller uses a dedicated pin to reset the connected >>> UFS device, which can operate either in a hardware controlled mode or as a >>> GPIO pin. >>> >> >> It's the only one 1.2V IO could be used on RK3576 to reset ufs devices, >> except ufs refclk. So it's a dedicated pin for sure if using ufs, that's >> why we put it into rk3576.dtsi. >> >>> Power-on default is GPIO mode, but the boot ROM reconfigures it to a >>> hardware controlled mode if it uses UFS to load the next boot stage. >>> >> >> ROM code could be specific, but the linux/loader driver is compatible， >> so for the coming SoCs, with more 1.2V IO could be used, it's more >> flexible to use gpio-based instead of hardware controlled(of course, >> move reset pinctrl settings into board dts). >> >>> Given that existing bindings (and rk3576.dtsi) expect a GPIO-controlled >>> device reset, request the required pin config explicitly. >>> >>> This doesn't appear to affect Linux, but it does affect U-boot: >>> >> >> IIUC, it's more or less a fix for loader, more precisely U-boot here? >> I'm not entirely certain about the handling here, is it standard >> convention to add a fixes tag in this context? > > Yes, a fixes tag is warranted here, in Linux it "only" fixes a potential > issue due to the mismatch between pinconfig and gpio during probe. > > nce this patch then enters the kernel, it can be cherry-picked to > the current u-boot development cycle. I don't think u-boot is doing > stable releases though, so U-Boot will only profit for the next > version where this is included. > U-Boot only takes what's in devicetree-rebasing (https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git), so only from Linus's tree AFAICT. C.f. https://docs.u-boot.org/en/latest/develop/process.html#resyncing-of-the-device-tree-subtree and https://docs.u-boot.org/en/latest/develop/devicetree/control.html#resyncing-with-devicetree-rebasing. See also OF_UPSTREAM Kconfig symbol in U-Boot. This policy does make adding support for a new board quite slow as we may need to wait months before it makes it to Linus's tree, and then go through the development cycle in U-Boot which can also take a few months if the timing is unfortunate. For now it seems like we're sticking with this policy to avoid too much in "downstream" DT in U-Boot. I know we push for this aggressively for new Rockchip boards and SoCs, cannot say for other vendors. Cheers, Quentin