OS - Linux
Query statement:
I want to enable and use UART5 on main domain of SOC. As there is no readymade "dtso" file for UART5 from TI, I tired to edit "k3-am62p5-mcan.dtso". After applying UART5 changes, we could not see UART5 enabled and can not use it.
Backgound / additional information:
1. I want to use UART5 available on 40 pin user expansion header ( Pin No 8 and Pin No 10)
2. By default Pin 8 and 10 are assigned for mcan0 (main domain CAN) in Pin mux
3. I want to map Pin mux (pin 8 and Pin 10) to UART-5 instead of mcan0.
4. I modified the pin mux setting in "k3-am62p5-mcan.dtso" as below
5. I disabled mcan0 driver
6. I added uart5 node configuration as below
5. "k3-am62p5-mcan.dtso" overlay is applied already and working for other CAN port which is mcan1 ( we want to replace mcan0. just to clarify)
Tool/software:
// SPDX-License-Identifier: GPL-2.0
/**
* DT overlay for enabling MCAN for AM62P-SK
*
* Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/
*/
/dts-v1/;
/plugin/;
#include <dt-bindings/gpio/gpio.h>
#include "k3-pinctrl.h"
&{/} {
transceiver1: can-phy0 {
compatible = "ti,tcan1042";
#phy-cells = <0>;
max-bitrate = <5000000>;
};
transceiver2: can-phy1 {
compatible = "ti,tcan1042";
#phy-cells = <0>;
max-bitrate = <5000000>;
};
transceiver3: can-phy2 {
compatible = "ti,tcan1042";
#phy-cells = <0>;
max-bitrate = <5000000>;
};
transceiver4: can-phy3 {
compatible = "ti,tcan1042";
#phy-cells = <0>;
max-bitrate = <5000000>;
};
};
&main_pmx0 {
main_mcan0_pins_default: main-mcan0-pins-default {
pinctrl-single,pins = <
AM62PX_IOPAD(0x01dc, PIN_INPUT, 0) /* (F20) MCAN0_RX */
AM62PX_IOPAD(0x01d8, PIN_OUTPUT, 0) /* (B23) MCAN0_TX */
>;
};
main_uart5_pins_default: main-uart5-pins-default {
pinctrl-single,pins = <
AM62PX_IOPAD(0x01dc, PIN_OUTPUT, 1) /* (F20) MCAN0_RX */
AM62PX_IOPAD(0x01d8, PIN_INPUT, 1) /* (B23) MCAN0_TX */
>;
};
main_mcan1_pins_default: main-mcan1-pins-default {
pinctrl-single,pins = <
AM62PX_IOPAD(0x00b4, PIN_INPUT, 5) /* (U25) GPMC0_CSn3.MCAN1_RX */
AM62PX_IOPAD(0x00b0, PIN_OUTPUT, 5) /* (T22) GPMC0_CSn2.MCAN1_TX */
>;
};
};
&mcu_pmx0 {
mcu_mcan0_pins_default: mcu-mcan0-pins-default {
pinctrl-single,pins = <
AM62PX_MCU_IOPAD(0x0038, PIN_INPUT, 0) /* (D6) MCU_MCAN0_RX */
AM62PX_MCU_IOPAD(0x0034, PIN_OUTPUT, 0) /* (E8) MCU_MCAN0_TX */
>;
};
mcu_mcan1_pins_default: mcu-mcan1-pins-default {
pinctrl-single,pins = <
AM62PX_MCU_IOPAD(0x0040, PIN_INPUT, 0) /* (E7) MCU_MCAN1_RX */
AM62PX_MCU_IOPAD(0x003c, PIN_OUTPUT, 0) /* (F8) MCU_MCAN1_TX */
>;
};
};
&main_i2c2{
/*
* main_i2c2 is using (U25) and (T22)
* so disable to use main_mcan1
*/
status = "disabled";
};
&main_i2c1 {
/*
* Unset GPIO SoC_I2C2_MCAN_SEL to
* route MCAN1 signals to MCAN1 HDR
*/
gpio@23 {
p20-hog {
/* P20 - SoC_I2C2_MCAN_SEL */
gpio-hog;
gpios = <16 GPIO_ACTIVE_HIGH>;
output-low;
line-name = "SoC_I2C2_MCAN_SEL";
};
};
};
&main_uart5 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&main_uart5_pins_default>;
};
&main_mcan0 {
status = "disabled";
pinctrl-names = "default";
pinctrl-0 = <&main_mcan0_pins_default>;
phys = <&transceiver1>;
};
&main_mcan1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&main_mcan1_pins_default>;
phys = <&transceiver2>;
};
&mcu_mcan0 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&mcu_mcan0_pins_default>;
phys = <&transceiver3>;
};
&mcu_mcan1 {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&mcu_mcan1_pins_default>;
phys = <&transceiver4>;
};I am using the Yocto project to build for the AM62P-LP EVM. I'm trying to modify the device tree source (DTS) file for UART5. However, main_mcan0 is also using the same GPIOs as UART5. To resolve this, I modified the k3-am62p5-sk-mcan.dts file, and my plan was to apply the .dtbo (Device Tree Overlay) file whenever I wanted to use UART5.
The issue is that after making the changes to the k3-am62p5-sk-mcan.dts file and applying the .dtbo file, it's not working as expected. I have shared the modified .dts file. Can you please provide a solution for this problem?
