SK-AM62A-LP: How to configure/use expansion header J3 GPIO

Hello,

Which SDK version are you using? SDK 9.0 has a few issues with TI-GPIO library for AM62A.

What device tree changes have you made for this GPIO pin?

Best Regards,

Anshu

Hello. I followed this guide for yocto build : https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/09_01_00/exports/docs/linux/Overview_Building_the_SDK.html

Then : https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/09_01_00/exports/docs/devices/AM62AX/linux/Release_Specific_Release_Notes.html

The config file :
https://git.ti.com/cgit/arago-project/oe-layersetup/commit/?id=9e276034c901bb7cf96c6ad569672a0747a213f8

I think it's 9.1.0 / How i can check that ?

I don't change anythings on device tree.

Regards

Hi,

I had made a patch to activate pin 35 and 37 of rpi header. See under

diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index 6f102b430202..6d3c59b1f41a 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -248,6 +248,12 @@ usr_led_pins_default: usr-led-pins-default {
 			AM62X_IOPAD(0x244, PIN_OUTPUT, 7) /* (C17/B15) MMC1_SDWP.GPIO1_49 */
 		>;
 	};
+	usr_exp_gpio_pins_default: usr-exp-gpio-pins-default {
+	    	pinctrl-single,pins = <
+		AM62AX_IOPAD(0x01ac, PIN_OUTPUT, 7) /* (B21) MCASP0_AFSR.GPIO1_13 */
+            	AM62AX_IOPAD(0x00a8, PIN_OUTPUT, 7) /* (M19) GPMC0_CSn0.GPIO0_41 */
+        	 >;
+	};
 
 	main_mdio1_pins_default: main-mdio1-pins-default {
 		pinctrl-single,pins = <
@@ -597,3 +603,9 @@ &mcu_gpio0 {
 &mcu_gpio_intr {
 	status = "reserved";
 };
+
+&main_gpio1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usr_exp_gpio_pins_default>;
+	status = "okay";
+};

But this don't work with gpiolib or python script ...

Do you see any mistake ?

Hi,

Can you confirm that you are using SK-AM62A-LP? The device tree you are using 'k3-am62x-sk-common.dtsi' is for AM62x, not AM62A.

Please see here for the SDK documentation for which device tree supports AM62A: https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/09_01_00/exports/docs/linux/Foundational_Components_Kernel_Users_Guide.html#compiling-the-device-tree-binaries

Best Regards,

Anshu

Hi, yes i use SK-AM62A-LP. I followed your documentation --> don't work ...
I modified the file k3-am62-lp-sk.dts like described in your link


see my patch

diff --git a/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts b/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts
index 1f26120e8f17..0dce167d5228 100644
--- a/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts
+++ b/arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts
@@ -90,6 +90,18 @@ pmic_irq_pins_default: pmic-irq-pins-default {
 			AM62X_IOPAD(0x01f4, PIN_INPUT, 0) /* (B16) EXTINTn */
 		>;
 	};
+	usr_exp_gpio_pins_default: usr-exp-gpio-pins-default {
+	    	pinctrl-single,pins = <
+			AM62AX_IOPAD(0x01ac, PIN_OUTPUT, 7) /* (B21) MCASP0_AFSR.GPIO1_13 */
+            		AM62AX_IOPAD(0x00a8, PIN_OUTPUT, 7) /* (M19) GPMC0_CSn0.GPIO0_41 */
+        	 >;
+	};
+};
+
+&main_gpio1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usr_exp_gpio_pins_default>;
+	status = "okay";
 };
 
 &main_i2c1 {

gpiodetect give me this

root@am62axx-evm:/opt/edgeai-gst-apps# gpiodetect
gpiochip0 [1-0023] (24 lines)
gpiochip1 [4201000.gpio] (24 lines)
gpiochip2 [600000.gpio] (92 lines)
gpiochip3 [601000.gpio] (52 lines)
gpiochip4 [tps6594-gpio] (11 lines)
gpiochip5 [1-0022] (24 lines)

If i understand, to change the state of gpio0_41 (header j3-37) i need to do : gpioset gpiochip3 41=1  ?

Also tried python samples (test_all_pins.py) --> same result !

that is strange is that i don't find a k3-am62-lp-sk.dtb on the target boot files ?!

root@am62axx-evm:/opt/edgeai-gst-apps# ls /boot/dtb/ti/
k3-am62a7-sk-e3-max-opp.dtbo      k3-am62a7-sk.dtb                   k3-am62x-sk-hdmi-audio.dtbo        k3-fpdlink-imx390-rcm-0-2.dtbo  k3-fpdlink-imx390-rcm-1-3.dtbo
k3-am62a7-sk-ethernet-dc01.dtbo   k3-am62x-sk-csi2-imx219.dtbo       k3-am62x-sk-lpm-wkup-sources.dtbo  k3-fpdlink-imx390-rcm-0-3.dtbo  k3-fpdlink-ov2312-0-0.dtbo
k3-am62a7-sk-fusion.dtbo          k3-am62x-sk-csi2-ov5640.dtbo       k3-am62x-sk-mcan.dtbo              k3-fpdlink-imx390-rcm-1-0.dtbo  k3-fpdlink-ov2312-0-1.dtbo
k3-am62a7-sk-rpi-hdr-ehrpwm.dtbo  k3-am62x-sk-csi2-tevi-ov5640.dtbo  k3-fpdlink-imx390-rcm-0-0.dtbo     k3-fpdlink-imx390-rcm-1-1.dtbo  k3-fpdlink-ov2312-0-2.dtbo
k3-am62a7-sk-ub954-evm.dtbo       k3-am62x-sk-eqep.dtbo              k3-fpdlink-imx390-rcm-0-1.dtbo     k3-fpdlink-imx390-rcm-1-2.dtbo  k3-fpdlink-ov2312-0-3.dtbo

Is it possible to have a patch to activate the good pins (35/37 output) for the sk-am62a-lp please ? i loose too times and i need to advance on my project please ?

Ok thanks, now it work !

Thanks for the update. This thread will be closed.

Best Regards,

Anshu