linux-kernel - [PATCH 7/7] DONOTMERGE: arm64: dts: ti: k3-am62x-sk: Enable PRU UART

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Message-ID: <20250513215934.933807-8-jm@ti.com>
Date: Tue, 13 May 2025 16:59:34 -0500
From: Judith Mendez <jm@...com>
To: Judith Mendez <jm@...com>,
        Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
CC: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
        Santosh
 Shilimkar <ssantosh@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero
 Kristo <kristo@...nel.org>, Bin Liu <b-liu@...com>,
        Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>,
        Andrew Davis <afd@...com>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 7/7] DONOTMERGE: arm64: dts: ti: k3-am62x-sk: Enable PRU UART

There is one PRU UART module in the PRU subsystem for am62 SoC.

UART RX/TX signals for PRU UART in PRU subsystem can be routed from/to
the user expansion header J3 (pins 10/8) on am62x SK, so enable
pruss_uart by default and add pinmux node.

Signed-off-by: Judith Mendez <jm@...com>
---
 arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index ee8337bfbbfd..c474e1d1a74d 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -15,6 +15,7 @@ aliases {
 		serial0 = &wkup_uart0;
 		serial1 = &mcu_uart0;
 		serial2 = &main_uart0;
+		serial3 = &pruss_uart;
 		mmc0 = &sdhci0;
 		mmc1 = &sdhci1;
 		mmc2 = &sdhci2;
@@ -181,6 +182,13 @@ AM62X_IOPAD(0x1b0, PIN_OUTPUT, 2) /* (A20/D16) MCASP0_ACLKR.UART1_TXD */
 		>;
 	};
 
+	pruss_uart_pins: pruss-uart-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x01d8, PIN_INPUT, 6) /* (C15) MCAN0_TX.PR0_UART0_RXD */
+			AM62X_IOPAD(0x01dc, PIN_OUTPUT, 6) /* (E15) MCAN0_RX.PR0_UART0_TXD */
+		>;
+	};
+
 	main_i2c0_pins_default: main-i2c0-default-pins {
 		pinctrl-single,pins = <
 			AM62X_IOPAD(0x1e0, PIN_INPUT_PULLUP, 0) /* (B16/E12) I2C0_SCL */
@@ -370,6 +378,12 @@ &main_uart1 {
 	pinctrl-0 = <&main_uart1_pins_default>;
 };
 
+&pruss_uart {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pruss_uart_pins>;
+	status = "okay";
+};
+
 &main_i2c0 {
 	status = "okay";
 	pinctrl-names = "default";
-- 
2.49.0