linux-kernel - [PATCH v4] arm64: dts: ti: k3-j721s2: Add support for CAN instances 3 and 5 in main domain

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Message-ID: <20230622185100.12197-1-b-kapoor@ti.com>
Date:   Fri, 23 Jun 2023 00:21:00 +0530
From:   Bhavya Kapoor <b-kapoor@...com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <u-kumar1@...com>, <b-kapoor@...com>
Subject: [PATCH v4] arm64: dts: ti: k3-j721s2: Add support for CAN instances 3 and 5 in main domain

CAN instances 3 and 5 in the main domain are brought on the common
processor board through header J27 and J28. The CAN High and Low lines
from the SoC are routed through a mux on the SoM. The select lines need
to be set for the CAN signals to get connected to the transceivers on
the common processor board. Threfore, add respective mux, transceiver
dt nodes to add support for these CAN instances.

Reviewed-by: Udit Kumar <u-kumar1@...com>
Signed-off-by: Bhavya Kapoor <b-kapoor@...com>
---

Changelog v3->v4 :
- Modified mux controller names

Link to v3 : https://lore.kernel.org/all/20230526165505.45172-1-b-kapoor@ti.com/

 .../dts/ti/k3-j721s2-common-proc-board.dts    | 46 +++++++++++++++++++
 arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi  | 12 +++++
 2 files changed, 58 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
index b4b9edfe2d12..07016c87f4da 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-common-proc-board.dts
@@ -27,6 +27,8 @@ aliases {
 		can0 = &main_mcan16;
 		can1 = &mcu_mcan0;
 		can2 = &mcu_mcan1;
+		can3 = &main_mcan3;
+		can4 = &main_mcan5;
 	};
 
 	evm_12v0: fixedregulator-evm12v0 {
@@ -107,6 +109,22 @@ transceiver2: can-phy2 {
 		standby-gpios = <&wkup_gpio0 2 GPIO_ACTIVE_HIGH>;
 	};
 
+	transceiver3: can-phy3 {
+		compatible = "ti,tcan1043";
+		#phy-cells = <0>;
+		max-bitrate = <5000000>;
+		standby-gpios = <&exp2 7 GPIO_ACTIVE_LOW>;
+		enable-gpios = <&exp2 6 GPIO_ACTIVE_HIGH>;
+		mux-states = <&mux0 1>;
+	};
+
+	transceiver4: can-phy4 {
+		compatible = "ti,tcan1042";
+		#phy-cells = <0>;
+		max-bitrate = <5000000>;
+		standby-gpios = <&exp_som 7 GPIO_ACTIVE_HIGH>;
+		mux-states = <&mux1 1>;
+	};
 };
 
 &main_pmx0 {
@@ -144,6 +162,20 @@ vdd_sd_dv_pins_default: vdd-sd-dv-pins-default {
 			J721S2_IOPAD(0x020, PIN_INPUT, 7) /* (AA23) MCAN15_RX.GPIO0_8 */
 		>;
 	};
+
+	main_mcan3_pins_default: main-mcan3-pins-default {
+		pinctrl-single,pins = <
+			J721S2_IOPAD(0x080, PIN_INPUT, 0) /* (U26) MCASP0_AXR4.MCAN3_RX */
+			J721S2_IOPAD(0x07c, PIN_OUTPUT, 0) /* (T27) MCASP0_AXR3.MCAN3_TX */
+		>;
+	};
+
+	main_mcan5_pins_default: main-mcan5-pins-default {
+		pinctrl-single,pins = <
+			J721S2_IOPAD(0x03c, PIN_INPUT, 0) /* (U27) MCASP0_AFSX.MCAN5_RX */
+			J721S2_IOPAD(0x038, PIN_OUTPUT, 0) /* (AB28) MCASP0_ACLKX.MCAN5_TX */
+		>;
+	};
 };
 
 &wkup_pmx0 {
@@ -353,3 +385,17 @@ adc {
 		ti,adc-channels = <0 1 2 3 4 5 6 7>;
 	};
 };
+
+&main_mcan3 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_mcan3_pins_default>;
+	phys = <&transceiver3>;
+};
+
+&main_mcan5 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_mcan5_pins_default>;
+	phys = <&transceiver4>;
+};
diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi
index 6930efff8a5a..84e50e891ee2 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-som-p0.dtsi
@@ -31,6 +31,18 @@ secure_ddr: optee@...00000 {
 		};
 	};
 
+	mux0: mux-controller@0 {
+		compatible = "gpio-mux";
+		#mux-state-cells = <1>;
+		mux-gpios = <&exp_som 1 GPIO_ACTIVE_HIGH>;
+	};
+
+	mux1: mux-controller@1 {
+		compatible = "gpio-mux";
+		#mux-state-cells = <1>;
+		mux-gpios = <&exp_som 2 GPIO_ACTIVE_HIGH>;
+	};
+
 	transceiver0: can-phy0 {
 		/* standby pin has been grounded by default */
 		compatible = "ti,tcan1042";
-- 
2.39.2