linux-kernel - [PATCH 5/8] riscv: dts: thead: Add TH1520 pinctrl settings for UART0

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Message-Id: <20241014-th1520-pinctrl-dts-v1-5-268592ca786e@tenstorrent.com>
Date: Mon, 14 Oct 2024 10:54:22 -0700
From: Drew Fustini <dfustini@...storrent.com>
To: Emil Renner Berthing <emil.renner.berthing@...onical.com>, 
 Drew Fustini <drew@...7.com>, Guo Ren <guoren@...nel.org>, 
 Fu Wei <wefu@...hat.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>, Albert Ou <aou@...s.berkeley.edu>, 
 Thomas Bonnefille <thomas.bonnefille@...tlin.com>, 
 Kanak Shilledar <kanakshilledar@...il.com>
Cc: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Drew Fustini <dfustini@...storrent.com>
Subject: [PATCH 5/8] riscv: dts: thead: Add TH1520 pinctrl settings for
 UART0

From: Emil Renner Berthing <emil.renner.berthing@...onical.com>

Add pinctrl settings for UART0 used as the default debug console on
both the Lichee Pi 4A and BeagleV Ahead boards.

Acked-by: Linus Walleij <linus.walleij@...aro.org>
Tested-by: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
Signed-off-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
Signed-off-by: Drew Fustini <dfustini@...storrent.com>
---
 arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts | 26 ++++++++++++++++++++++
 arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts  | 26 ++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
index 1a4154a6ff3b..0484fb390be4 100644
--- a/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
+++ b/arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts
@@ -61,6 +61,30 @@ &emmc {
 	status = "okay";
 };
 
+&padctrl0_apsys {
+	uart0_pins: uart0-0 {
+		tx-pins {
+			pins = "UART0_TXD";
+			function = "uart";
+			bias-disable;
+			drive-strength = <3>;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+
+		rx-pins {
+			pins = "UART0_RXD";
+			function = "uart";
+			bias-pull-up;
+			drive-strength = <1>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+};
+
 &sdio0 {
 	bus-width = <4>;
 	max-frequency = <198000000>;
@@ -68,6 +92,8 @@ &sdio0 {
 };
 
 &uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
 	status = "okay";
 };
 
diff --git a/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts b/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
index 58ad381fc1c3..f60b1879192d 100644
--- a/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
+++ b/arch/riscv/boot/dts/thead/th1520-lichee-pi-4a.dts
@@ -30,7 +30,33 @@ chosen {
 	};
 };
 
+&padctrl0_apsys {
+	uart0_pins: uart0-0 {
+		tx-pins {
+			pins = "UART0_TXD";
+			function = "uart";
+			bias-disable;
+			drive-strength = <3>;
+			input-disable;
+			input-schmitt-disable;
+			slew-rate = <0>;
+		};
+
+		rx-pins {
+			pins = "UART0_RXD";
+			function = "uart";
+			bias-disable;
+			drive-strength = <1>;
+			input-enable;
+			input-schmitt-enable;
+			slew-rate = <0>;
+		};
+	};
+};
+
 &uart0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart0_pins>;
 	status = "okay";
 };
 

-- 
2.34.1