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([2804:1b3:a801:a24:2dbd:5df3:bcf7:deda]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3142a1bb8a4sm44786669eec.14.2026.07.20.20.00.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2026 20:00:55 -0700 (PDT) From: Fabio Estevam To: heiko@sntech.de Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, Fabio Estevam Subject: [PATCH] arm64: dts: rockchip: Enable USB device mode on rk3399-roc-pc-plus Date: Tue, 21 Jul 2026 00:00:43 -0300 Message-ID: <20260721030043.84691-1-festevam@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260720_200102_384422_C3A7339F X-CRM114-Status: GOOD ( 14.59 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Fabio Estevam The USB3 OTG controller on the rk3399-roc-pc-plus is forced to host mode. As a result, it does not register a UDC and USB gadget drivers fail with: UDC core: g_mass_storage: couldn't find an available UDC Describe the controller as a USB role switch and select peripheral as the default role. This makes DWC3 register a UDC when no external role provider has selected a host role, while retaining OTG operation and both the USB2 and USB3 PHYs inherited from the SoC dtsi. Tested by binding g_mass_storage and exposing the onboard eMMC to a Linux host. Fixes: 6d9a7bd6a13c ("arm64: dts: rockchip: add support for Firefly ROC-RK3399-PC-PLUS") Signed-off-by: Fabio Estevam --- arch/arm64/boot/dts/rockchip/rk3399-roc-pc-plus.dts | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-plus.dts b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-plus.dts index 7e8039b19be7..c733429fd5d9 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-plus.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc-plus.dts @@ -270,7 +270,9 @@ bluetooth { }; &usbdrd_dwc3_0 { - dr_mode = "host"; + dr_mode = "otg"; + role-switch-default-mode = "peripheral"; + usb-role-switch; status = "okay"; }; -- 2.43.0