linux-kernel - [RFC PATCH 4/4] riscv: dts: eswin: Add HiFive Premier UART pin control

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Message-ID: <20250325141311.758787-5-emil.renner.berthing@canonical.com>
Date: Tue, 25 Mar 2025 15:13:06 +0100
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Pinkesh Vaghela <pinkesh.vaghela@...fochips.com>,
	Pritesh Patel <pritesh.patel@...fochips.com>,
	Min Lin <linmin@...incomputing.com>
Cc: Samuel Holland <samuel.holland@...ive.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: [RFC PATCH 4/4] riscv: dts: eswin: Add HiFive Premier UART pin control

Add pin control for UART0 and UART2 in the HiFive Premier P550 device
tree.

Signed-off-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
---
 .../dts/eswin/eic7700-hifive-premier-p550.dts | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/arch/riscv/boot/dts/eswin/eic7700-hifive-premier-p550.dts b/arch/riscv/boot/dts/eswin/eic7700-hifive-premier-p550.dts
index 131ed1fc6b2e..c278695dcb2d 100644
--- a/arch/riscv/boot/dts/eswin/eic7700-hifive-premier-p550.dts
+++ b/arch/riscv/boot/dts/eswin/eic7700-hifive-premier-p550.dts
@@ -20,10 +20,56 @@ chosen {
 	};
 };
 
+&pinctrl {
+	uart0_pins: uart0-0 {
+		tx-pins {
+			pins = "UART0_TX";
+			function = "uart";
+			bias-disable;
+			drive-strength-microamp = <6700>;
+			input-disable;
+			input-schmitt-disable;
+		};
+
+		rx-pins {
+			pins = "UART0_RX";
+			function = "uart";
+			bias-disable;
+			drive-strength-microamp = <6700>;
+			input-enable;
+			input-schmitt-disable;
+		};
+	};
+
+	uart2_pins: uart2-0 {
+		tx-pins {
+			pins = "UART2_TX";
+			function = "uart";
+			bias-disable;
+			drive-strength-microamp = <6700>;
+			input-disable;
+			input-schmitt-disable;
+		};
+
+		rx-pins {
+			pins = "UART2_RX";
+			function = "uart";
+			bias-disable;
+			drive-strength-microamp = <6700>;
+			input-enable;
+			input-schmitt-disable;
+		};
+	};
+};
+
 &uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
 	status = "okay";
 };
 
 &uart2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart2_pins>;
 	status = "okay";
 };
-- 
2.43.0