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Received: from DS2PR12MB9750.namprd12.prod.outlook.com (2603:10b6:8:2b0::12) by DS0PR12MB6559.namprd12.prod.outlook.com (2603:10b6:8:d1::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9478.4; Tue, 13 Jan 2026 10:58:45 +0000 Received: from DS2PR12MB9750.namprd12.prod.outlook.com ([fe80::56a8:d6bf:e24c:b391]) by DS2PR12MB9750.namprd12.prod.outlook.com ([fe80::56a8:d6bf:e24c:b391%5]) with mapi id 15.20.9499.005; Tue, 13 Jan 2026 10:58:45 +0000 Message-ID: <06c3595f-7aa6-449f-bd91-55b4db377579@nvidia.com> Date: Tue, 13 Jan 2026 10:58:40 +0000 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/5] Fixes to Tegra USB role switching and Smaug USB role switching enablement To: Rob Herring , Diogo Ivo Cc: Thierry Reding , linux-tegra@vger.kernel.org, JC Kuo , Krzysztof Kozlowski , linux-kernel@vger.kernel.org, Mathias Nyman , Conor Dooley , devicetree@vger.kernel.org, linux-usb@vger.kernel.org, Greg Kroah-Hartman , Vinod Koul , Kishon Vijay Abraham I , linux-phy@lists.infradead.org References: <20251204-diogo-tegra_phy-v1-0-51a2016d0be8@tecnico.ulisboa.pt> <176497381829.863612.7431013132555369131.robh@kernel.org> From: Jon Hunter Content-Language: en-US In-Reply-To: <176497381829.863612.7431013132555369131.robh@kernel.org> X-ClientProxiedBy: LO2P123CA0083.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:138::16) To DS2PR12MB9750.namprd12.prod.outlook.com (2603:10b6:8:2b0::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PR12MB9750:EE_|DS0PR12MB6559:EE_ X-MS-Office365-Filtering-Correlation-Id: a5eddbbe-d9d7-4378-c567-08de5292b8a1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024|13003099007; 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charset="us-ascii"; Format="flowed" Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org Hi Diogo, On 05/12/2025 22:36, Rob Herring wrote: > > On Thu, 04 Dec 2025 21:27:16 +0000, Diogo Ivo wrote: >> Hello, >> >> This patch series contains two fixes for USB role switching on the >> Tegra210 SoC, as well as enabling this feature on the Pixel C. >> >> The first patch addresses a wrong check on the logic that disables the >> VBUS regulator. >> >> The second patch guarantees proper ordering of events when switching PHY >> roles. >> >> The third and fourth patches then add the necessary nodes and properties >> in the Smaug DT in order for role switching to work. Currently with this >> patch series this feature can only be controlled from userspace by writing >> the desired role to sysfs as >> >> echo "role" > /sys/class/usb_role/usb2-0-role-switch/role >> >> with role being one of {device, host, none}. >> >> Further patches will enable automatic role switching via the 'cros_ec_typec' >> driver which is currently broken on Smaug. >> >> N.B: This series does not add a 'connector' node under the 'usb-role-switch' >> property added on patch 04/04 because for Smaug the connector should instead >> be under the node for 'cros_ec_typec' node and as stated above this >> driver is currently broken for this device. If it is deemed better to >> describe it but explicitly disable the node let me know and I will send >> out a v2. >> >> Signed-off-by: Diogo Ivo >> --- >> Diogo Ivo (5): >> usb: host: tegra: Remove redundant pm_runtime_mark_last_busy() call >> phy: tegra: xusb: Fix USB2 port regulator disable logic >> phy: tegra: xusb: Fix ordering issue when switching roles on USB2 ports >> arm64: tegra: smaug: Complete and enable tegra-udc node >> arm64: tegra: smaug: Add usb-role-switch support >> >> arch/arm64/boot/dts/nvidia/tegra210-smaug.dts | 13 +++++++++++++ >> drivers/phy/tegra/xusb-tegra210.c | 5 +++-- >> drivers/phy/tegra/xusb.c | 23 +++++++++++++++++++++++ >> drivers/phy/tegra/xusb.h | 1 + >> drivers/usb/gadget/udc/tegra-xudc.c | 4 ++++ >> drivers/usb/host/xhci-tegra.c | 17 ++++++++++------- >> include/linux/phy/tegra/xusb.h | 1 + >> 7 files changed, 55 insertions(+), 9 deletions(-) >> --- >> base-commit: a8817ff3b5cd99b0a5af57a92d1a3a7980612550 >> change-id: 20251201-diogo-tegra_phy-86c89cab7377 >> >> Best regards, >> -- >> Diogo Ivo >> >> >> > > > My bot found new DTB warnings on the .dts files added or changed in this > series. > > Some warnings may be from an existing SoC .dtsi. Or perhaps the warnings > are fixed by another series. Ultimately, it is up to the platform > maintainer whether these warnings are acceptable or not. No need to reply > unless the platform maintainer has comments. > > If you already ran DT checks and didn't see these error(s), then > make sure dt-schema is up to date: > > pip3 install dtschema --upgrade > > > This patch series was applied (using b4) to base: > Base: base-commit a8817ff3b5cd99b0a5af57a92d1a3a7980612550 not known, ignoring > Base: attempting to guess base-commit... > Base: tags/v6.18-rc7-8-gf402ecd7a8b6 (exact match) > Base: tags/v6.18-rc7-8-gf402ecd7a8b6 (use --merge-base to override) > > If this is not the correct base, please add 'base-commit' tag > (or use b4 which does this automatically) > > New warnings running 'make CHECK_DTBS=y for arch/arm64/boot/dts/nvidia/' for 20251204-diogo-tegra_phy-v1-0-51a2016d0be8@tecnico.ulisboa.pt: > > arch/arm64/boot/dts/nvidia/tegra210-smaug.dtb: padctl@7009f000 (nvidia,tegra210-xusb-padctl): ports:usb2-0: 'role-switch-default-mode' does not match any of the regexes: '^pinctrl-[0-9]+$' > from schema $id: http://devicetree.org/schemas/phy/nvidia,tegra210-xusb-padctl.yaml > arch/arm64/boot/dts/nvidia/tegra210-smaug.dtb: padctl@7009f000 (nvidia,tegra210-xusb-padctl): ports:usb2-0: 'connector' is a dependency of 'usb-role-switch' > from schema $id: http://devicetree.org/schemas/phy/nvidia,tegra210-xusb-padctl.yaml Per the report above and my other email, this series adds more warnings and we are trying to avoid that, even if such warnings are seen on other Tegra platforms. Jon -- nvpublic -- linux-phy mailing list linux-phy@lists.infradead.org https://lists.infradead.org/mailman/listinfo/linux-phy