linux-kernel - [PATCH v2 2/2] arm64: dts: ti: k3-j722s-evm: Describe main

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Message-ID: <20240827105644.575862-3-b-kapoor@ti.com>
Date: Tue, 27 Aug 2024 16:26:44 +0530
From: Bhavya Kapoor <b-kapoor@...com>
To: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <conor+dt@...nel.org>,
        <krzk+dt@...nel.org>, <robh@...nel.org>, <kristo@...nel.org>,
        <b-kapoor@...com>, <jm@...com>, <vigneshr@...com>, <nm@...com>
Subject: [PATCH v2 2/2] arm64: dts: ti: k3-j722s-evm: Describe main_uart5

System firmware uses main_uart5 in J722S EVM for trace data.
Thus, describe it in device tree for completeness,
adding the pinmux and mark it as reserved.

Signed-off-by: Bhavya Kapoor <b-kapoor@...com>
---

Link to v1: https://lore.kernel.org/all/20240822053538.10475-1-b-kapoor@ti.com/

changelog v1->v2:
	- Modified commit message to be more clear
	- provide documentation on why main_uart5 is reserved

 arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
index 8daa47a245aa..41c36f82a3c5 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
@@ -20,6 +20,7 @@ / {
 	aliases {
 		serial0 = &wkup_uart0;
 		serial2 = &main_uart0;
+		serial3 = &main_uart5;
 		mmc0 = &sdhci0;
 		mmc1 = &sdhci1;
 	};
@@ -211,6 +212,13 @@ J722S_IOPAD(0x01cc, PIN_OUTPUT, 0)	/* (B22) UART0_TXD */
 		bootph-all;
 	};
 
+	main_uart5_pins_default: main-uart5-default-pins {
+		pinctrl-single,pins = <
+			J722S_IOPAD(0x0108, PIN_INPUT, 3)       /* (J27) UART5_RXD */
+			J722S_IOPAD(0x010c, PIN_OUTPUT, 3)      /* (H27) UART5_TXD */
+		>;
+	};
+
 	vdd_sd_dv_pins_default: vdd-sd-dv-default-pins {
 		pinctrl-single,pins = <
 			J722S_IOPAD(0x0120, PIN_INPUT, 7) /* (F27) MMC2_CMD.GPIO0_70 */
@@ -330,6 +338,13 @@ &main_uart0 {
 	bootph-all;
 };
 
+&main_uart5 {
+	/* MAIN UART 5 is used by System firmware */
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_uart5_pins_default>;
+	status = "reserved";
+};
+
 &mcu_pmx0 {
 
 	mcu_mcan0_pins_default: mcu-mcan0-default-pins {
-- 
2.34.1