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From:   Bhavya Kapoor <b-kapoor@ti.com>
To:     <linux-arm-kernel@lists.infradead.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     <nm@ti.com>, <vigneshr@ti.com>, <kristo@kernel.org>,
        <robh+dt@kernel.org>, <krzysztof.kozlowski+dt@linaro.org>,
        <u-kumar1@ti.com>, <jm@ti.com>, <b-kapoor@ti.com>
Subject: [tiL6.1 PATCH v2] arm64: dts: ti: k3-j721s2: Add support for CAN instances 3 and 5 in main domain
Date:   Tue, 23 May 2023 14:20:21 +0530
Message-ID: <20230523085021.22524-1-b-kapoor@ti.com>
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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.

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

Changelog v1->v2: Modified indentation according to comments

Link to v1 : https://lore.kernel.org/all/20230412084935.699791-1-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 a7aa6cf08acd..f07663bbea16 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 {
@@ -309,3 +341,17 @@ &mcu_mcan1 {
 	pinctrl-0 = <&mcu_mcan1_pins_default>;
 	phys = <&transceiver2>;
 };
+
+&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..e74bc5141903 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@9e800000 {
 		};
 	};
 
+	mux0: mux-controller0 {
+		compatible = "gpio-mux";
+		#mux-state-cells = <1>;
+		mux-gpios = <&exp_som 1 GPIO_ACTIVE_HIGH>;
+	};
+
+	mux1: mux-controller1 {
+		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