[v4,4/4] DO_NOT_MERGE arm64: dts: ti: Enable MCU MCANs for AM62x
Commit Message
On AM62x there are no hardware interrupts routed to A53 GIC
interrupt controller for MCU MCAN IPs, so MCU MCANs were not
added to the MCU dtsi. In this patch series an hrtimer is introduced
to MCAN driver to generate software interrupts. Now add MCU MCAN
nodes to the MCU dtsi but disable the MCAN devices by default.
AM62x does not carry on-board CAN transceivers, so instead of
changing DTB permanently use an overlay to enable MCU MCANs and to
add CAN transceiver nodes.
If there is no hardware interrupt and timer method is used, remove
interrupt properties and add poll-interval to enable the hrtimer
per MCAN node.
This DT overlay can be used with the following EVM:
Link: https://www.ti.com/tool/TCAN1042DEVM
Signed-off-by: Judith Mendez <jm@ti.com>
---
Changelog:
v3:
1. Add link for specific board
arch/arm64/boot/dts/ti/Makefile | 2 +-
arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi | 24 ++++++++
.../boot/dts/ti/k3-am625-sk-mcan-mcu.dtso | 57 +++++++++++++++++++
3 files changed, 82 insertions(+), 1 deletion(-)
create mode 100644 arch/arm64/boot/dts/ti/k3-am625-sk-mcan-mcu.dtso
@@ -9,7 +9,7 @@
# alphabetically.
# Boards with AM62x SoC
-k3-am625-sk-mcan-dtbs := k3-am625-sk.dtb k3-am625-sk-mcan-main.dtbo
+k3-am625-sk-mcan-dtbs := k3-am625-sk.dtb k3-am625-sk-mcan-main.dtbo k3-am625-sk-mcan-mcu.dtbo
dtb-$(CONFIG_ARCH_K3) += k3-am625-beagleplay.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am625-sk.dtb
dtb-$(CONFIG_ARCH_K3) += k3-am625-sk-mcan.dtb
@@ -141,4 +141,28 @@
/* Tightly coupled to M4F */
status = "reserved";
};
+
+ mcu_mcan1: can@4e00000 {
+ compatible = "bosch,m_can";
+ reg = <0x00 0x4e00000 0x00 0x8000>,
+ <0x00 0x4e08000 0x00 0x200>;
+ reg-names = "message_ram", "m_can";
+ power-domains = <&k3_pds 188 TI_SCI_PD_EXCLUSIVE>;
+ clocks = <&k3_clks 188 6>, <&k3_clks 188 1>;
+ clock-names = "hclk", "cclk";
+ bosch,mram-cfg = <0x0 128 64 64 64 64 32 32>;
+ status = "disabled";
+ };
+
+ mcu_mcan2: can@4e10000 {
+ compatible = "bosch,m_can";
+ reg = <0x00 0x4e10000 0x00 0x8000>,
+ <0x00 0x4e18000 0x00 0x200>;
+ reg-names = "message_ram", "m_can";
+ power-domains = <&k3_pds 189 TI_SCI_PD_EXCLUSIVE>;
+ clocks = <&k3_clks 189 6>, <&k3_clks 189 1>;
+ clock-names = "hclk", "cclk";
+ bosch,mram-cfg = <0x0 128 64 64 64 64 32 32>;
+ status = "disabled";
+ };
};
new file mode 100644
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * DT overlay for MCAN in MCU domain on AM625 SK
+ *
+ * Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include "k3-pinctrl.h"
+
+&{/} {
+ transceiver2: can-phy1 {
+ compatible = "ti,tcan1042";
+ #phy-cells = <0>;
+ max-bitrate = <5000000>;
+ };
+
+ transceiver3: can-phy2 {
+ compatible = "ti,tcan1042";
+ #phy-cells = <0>;
+ max-bitrate = <5000000>;
+ };
+};
+
+&mcu_pmx0 {
+ mcu_mcan1_pins_default: mcu-mcan1-pins-default {
+ pinctrl-single,pins = <
+ AM62X_IOPAD(0x038, PIN_INPUT, 0) /* (B3) MCU_MCAN0_RX */
+ AM62X_IOPAD(0x034, PIN_OUTPUT, 0) /* (D6) MCU_MCAN0_TX */
+ >;
+ };
+
+ mcu_mcan2_pins_default: mcu-mcan2-pins-default {
+ pinctrl-single,pins = <
+ AM62X_IOPAD(0x040, PIN_INPUT, 0) /* (D4) MCU_MCAN1_RX */
+ AM62X_IOPAD(0x03C, PIN_OUTPUT, 0) /* (E5) MCU_MCAN1_TX */
+ >;
+ };
+};
+
+&mcu_mcan1 {
+ poll-interval;
+ pinctrl-names = "default";
+ pinctrl-0 = <&mcu_mcan1_pins_default>;
+ phys = <&transceiver2>;
+ status = "okay";
+};
+
+&mcu_mcan2 {
+ poll-interval;
+ pinctrl-names = "default";
+ pinctrl-0 = <&mcu_mcan2_pins_default>;
+ phys = <&transceiver3>;
+ status = "okay";
+};