linux-kernel - [PATCH v2 3/3] riscv: dts: starfive: jh7110-pine64-star64: force no USB overcurrent

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Message-ID: <20250424062154.655128-1-uwu@icenowy.me>
Date: Thu, 24 Apr 2025 14:21:54 +0800
From: Icenowy Zheng <uwu@...nowy.me>
To: Emil Renner Berthing <kernel@...il.dk>,
	Jianlong Huang <jianlong.huang@...rfivetech.com>,
	Hal Feng <hal.feng@...rfivetech.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Icenowy Zheng <uwu@...nowy.me>
Subject: [PATCH v2 3/3] riscv: dts: starfive: jh7110-pine64-star64: force no USB overcurrent

The Star64 board has no GPIOs to indicate USB overcurrent, however the
USB controller would stop to work if the overcurrent_n signal it gets is
low (which means overcurrent situations happening because of the _n).

Use the pin controller to force the overcurrent_n signal to be high in
order to ensure stable behavior of the USB controller.

Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
---
This patch depends on [1] for including the necessary header file.

[1] https://lore.kernel.org/linux-riscv/20250424060605.638678-1-uwu@icenowy.me/T/#u

 arch/riscv/boot/dts/starfive/jh7110-pine64-star64.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/riscv/boot/dts/starfive/jh7110-pine64-star64.dts b/arch/riscv/boot/dts/starfive/jh7110-pine64-star64.dts
index 31e825be2065a..4fb522d127e21 100644
--- a/arch/riscv/boot/dts/starfive/jh7110-pine64-star64.dts
+++ b/arch/riscv/boot/dts/starfive/jh7110-pine64-star64.dts
@@ -91,6 +91,13 @@ GPOEN_ENABLE,
 			input-schmitt-disable;
 			slew-rate = <0>;
 		};
+
+		overcurrent-pins {
+			pinmux = <GPIOMUX(PAD_INTERNAL_HIGH,
+					  GPOUT_LOW,
+					  GPOEN_DISABLE,
+					  GPI_SYS_USB_OVERCURRENT)>;
+		};
 	};
 };
 
-- 
2.49.0