How to control UART1,UART4,UART5 and UART6

Albert Wu

Prodigy 235 points

Dear TI ,

k3-am62-main.dtsi:

k3-am62x-sk-common.dtsi:

k3-am625-skeleton.dts:

over 1 year ago

0 Albert Wu over 1 year ago

Prodigy 235 points

Dear TI ,

HW : TI AM62x

I modify some device tree (k3-am62-main.dtsi , k3-am62x-sk-common.dtsi and k3-am625-skeleton.dts)

I run command as follows:

stty -F /dev/ttyS5 -echo -onlcr 115200
cat /dev/ttyS5 &
echo hello > /dev/ttyS5

I don't see any message. Please tell me how to modify device tree .

0 Albert Wu over 1 year ago in reply to Albert Wu

Prodigy 235 points

Dear Ti,

dmesg | grep serial

0 Bin Liu over 1 year ago in reply to Albert Wu

TI__Guru*** 147126 points

Hi Albert,

The dmesg log seems showing some pinmux are defined by multiple interfaces. Please review your device tree pinmux settings to ensure a PIN is only used by one interface.

And if any UART pin has mode0 in MMC pins, please disable the corresponding MMC interface in the device tree.

0 Albert Wu over 1 year ago in reply to Bin Liu

Prodigy 235 points

Dear Bin,

I think UART5 is OK because it is not related to mmc .

stty -F /dev/ttyS5 -echo -onlcr 115200
cat /dev/ttyS5 &
echo hello > /dev/ttyS5

it doesn't show any message . Please help to solve this problem.

0 Albert Wu over 1 year ago in reply to Albert Wu

Prodigy 235 points

Dear Bin,

I modify as follows:

k3-am62-main.dtsi:

main_uart1: serial@2810000 {
compatible = "ti,am64-uart", "ti,am654-uart";
reg = <0x00 0x02810000 0x00 0x100>;
interrupts = <GIC_SPI 179 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 152 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 152 0>;
clock-names = "fclk";

main_uart1_pins_default: main-uart1-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x1ac, PIN_OUTPUT, 2) /* (E19) UART1_RXD */
AM62X_IOPAD(0x1b0, PIN_INPUT, 2) /* (A20) UART1_TXD */

>;
};
};

main_uart4: serial@2840000 {
compatible = "ti,am64-uart", "ti,am654-uart";
reg = <0x00 0x02840000 0x00 0x100>;
interrupts = <GIC_SPI 182 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 155 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 155 0>;
clock-names = "fclk";

main_uart4_pins_default: main-uart4-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x124, PIN_OUTPUT, 3) /* (A23) UART4_RXD */
AM62X_IOPAD(0x128, PIN_INPUT, 3) /* (B23) UART4_TXD */
>;
};
};

main_uart5: serial@2850000 {
compatible = "ti,am64-uart", "ti,am654-uart";
reg = <0x00 0x02850000 0x00 0x100>;
interrupts = <GIC_SPI 183 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 156 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 156 0>;
clock-names = "fclk";

main_uart5_pins_default: main-uart5-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x108, PIN_OUTPUT, 3) /* (D24) UART5_RXD */
AM62X_IOPAD(0x10C, PIN_INPUT, 3) /* (E23) UART5_TXD */
>;
};
};

main_uart6: serial@2860000 {
compatible = "ti,am64-uart", "ti,am654-uart";
reg = <0x00 0x02860000 0x00 0x100>;
interrupts = <GIC_SPI 184 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 158 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 158 0>;
clock-names = "fclk";

main_uart6_pins_default: main-uart6-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x118, PIN_OUTPUT, 3) /* (D25) UART6_RXD */
AM62X_IOPAD(0x120, PIN_INPUT, 3) /* (C24) UART6_TXD */
>;
};
};

/*
sdhci2: mmc@fa20000 {
compatible = "ti,am62-sdhci";
reg = <0x00 0xfa20000 0x00 0x260>, <0x00 0xfa28000 0x00 0x134>;
interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&k3_pds 184 TI_SCI_PD_EXCLUSIVE>;
clocks = <&k3_clks 184 5>, <&k3_clks 184 6>;
clock-names = "clk_ahb", "clk_xin";
ti,trm-icp = <0x2>;
ti,otap-del-sel-legacy = <0x8>;
ti,otap-del-sel-sd-hs = <0x0>;
ti,otap-del-sel-sdr12 = <0x0>;
ti,otap-del-sel-sdr25 = <0x0>;
ti,otap-del-sel-sdr50 = <0x8>;
ti,otap-del-sel-sdr104 = <0x7>;
ti,otap-del-sel-ddr50 = <0x8>;
ti,itap-del-sel-legacy = <0xa>;
ti,itap-del-sel-sd-hs = <0xa>;
ti,itap-del-sel-sdr12 = <0xA>;
ti,itap-del-sel-sdr25 = <0x1>;
ti,clkbuf-sel = <0x7>;
};
*/

test result:

Please help fix this issue .

0 Albert Wu over 1 year ago in reply to Albert Wu

Prodigy 235 points

I modify the device tree again.

k3-am625-skeleton.dts:

&main_pmx0 {
main_uart0_pins_default: main-uart0-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x1c8, PIN_INPUT, 0) /* (D14) UART0_RXD */
AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14) UART0_TXD */
>;
};
main_uart1_pins_default: main-uart1-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x1ac, PIN_OUTPUT, 2) /* (E19) UART1_RXD */
AM62X_IOPAD(0x1b0, PIN_INPUT, 2) /* (A20) UART1_TXD */

>;
};
main_uart4_pins_default: main-uart4-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x124, PIN_OUTPUT, 3) /* (A23) UART4_RXD */
AM62X_IOPAD(0x128, PIN_INPUT, 3) /* (B23) UART4_TXD */
>;
};

main_uart5_pins_default: main-uart5-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x108, PIN_OUTPUT, 3) /* (D24) UART5_RXD */
AM62X_IOPAD(0x10C, PIN_INPUT, 3) /* (E23) UART5_TXD */
>;
};

main_uart6_pins_default: main-uart6-pins-default {
pinctrl-single,pins = <
AM62X_IOPAD(0x118, PIN_OUTPUT, 3) /* (D25) UART6_RXD */
AM62X_IOPAD(0x120, PIN_INPUT, 3) /* (C24) UART6_TXD */
>;
};
};

k3-am62-main.dtsi:

dmesg | grep serial

echo hello > /dev/ttyS1 . It can't show any message .

Please help fix this issue .

0 Bin Liu over 1 year ago in reply to Albert Wu

TI__Guru*** 147126 points

Hi Albert,

I see you are doing uart external loopback test. Did you connect the RXD and TXD pins together? If you connect a scope to the UART TXD pin, do you see the charactor bits on the scope?

0 Albert Wu over 1 year ago in reply to Bin Liu

Prodigy 235 points

Dear Bin,

About /dev/ttyS1, run echo hello > /dev/ttyS1 command . Measure UARt1_TXD , there is waveform output . But Measure UARt1_RXD , there is not waveform output . UART1_TXD and UART1_RXD is connected .

Please check if my tree is correct ?

k3-am625-skeleton.dts:

0 Albert Wu over 1 year ago in reply to Albert Wu

Prodigy 235 points

Dear Bin ,

I have fixed this issue . Thank you!

+1 Bin Liu over 1 year ago in reply to Albert Wu

TI__Guru*** 147126 points

Hi Albert,

Do you mind to explain what the issue was?

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How to control UART1,UART4,UART5 and UART6