gpioset not working when adding kernel-modules in yocto project imx8mmini dev board.

[vivek338]

gpioset not working when adding kernel-modules in yocto project imx8mmini.

gpiodetect and gpioinfo is working but gpioset not working. On removing kernel-modules from yocto project gpioset is working. The pin is permamnently high on imx8mmini dev board. Using pin 40 on J1003.

Please help!!!

[Sanket_Parekh]

Hi @vivek338 ,

I hope you are doing well.

In I.MX8MM EVK, pin 40 on J1003 which is the SAI5_RXC pad is used by the micfil device node for PDM_CLK

Please try applying the below change in the kernel device tree file(/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi)

&micfil {
#sound-dai-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pdm>;
assigned-clocks = <&clk IMX8MM_CLK_PDM>;
assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
assigned-clock-rates = <196608000>;
- status = "okay";
+ status = "disabled";

};

Thanks & Regards,
Sanket Parekh

[vivek338]

Hi Sanket_Parekh ,

Thank you for your reply !!!
But I am new to Yocto project so where to find this file or how to reach at that location.

Also UART3 pins are not working

root@imx8mmevk:~# echo "text" > /dev/ttymxc2

Broadcast message from systemd-journald@imx8mmevk (Thu 2023-03-30 05:50:44 UTC):

kernel[241]: [ 659.412754] Internal error: Oops: 96000044 [#1] PREEMPT SMP

Broadcast message from systemd-journald@imx8mmevk (Thu 2023-03-30 05:50:44 UTC):

kernel[241]: [ 659.622255] Code: b90026c0 52800400 531b6ab5 72a03060 (b90002e0)

Please help!!!!

[vivek338]

I found that location and modify

&micfil {
#sound-dai-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pdm>;
assigned-clocks = <&clk IMX8MM_CLK_PDM>;
assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
assigned-clock-rates = <196608000>;
- status = "okay";
+ status = "disabled";
};

But still problem is same

Please help!!!!

[Sanket_Parekh]

Hi @vivek338,

I hope you are doing well.

Please make sure that the changes are correctly applied to dtb in the final build.

Please mention the BSP version and output of the below command,

 # cat /sys/kernel/debug/gpio

Please add the below changes to the iomuxc node in dts.

&iomuxc {
          

          /delete-node/ pinctrl_pdm;
          pinctrl_hog: hoggrp {
              fsl,pins = <
                      MX8MM_IOMUXC_SAI5_RXC_GPIO3_IO20 0x11

              >;
 };

};

Please provide me with the commands used to toggle gpio and boot logs.

Regarding UART, please make sure that the sdma firmware is correctly loaded.

Thanks & Regards,

Sanket Parekh

[vivek338]

Hi @Sanket_Parekh 

Thanks for replying!!!!!

I have done changes in dtsi file and i follow below commands;-

$ bitbake -c devshell virtual/kernel  

$ make dtbs  
$ bitbake my-image

but issue still same...

root@imx8mmevk:~# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-31, parent: platform/30200000.gpio, 30200000.gpio:
gpio-13 ( |ir-receiver ) in hi IRQ ACTIVE LOW
gpio-15 ( |cd ) in lo IRQ ACTIVE LOW

gpiochip1: GPIOs 32-63, parent: platform/30210000.gpio, 30210000.gpio:
gpio-42 ( |reset ) out hi ACTIVE LOW
gpio-51 ( |regulator-usdhc2 ) out hi

gpiochip2: GPIOs 64-95, parent: platform/30220000.gpio, 30220000.gpio:
gpio-80 ( |status ) out hi

gpiochip3: GPIOs 96-127, parent: platform/30230000.gpio, 30230000.gpio:

gpiochip4: GPIOs 128-159, parent: platform/30240000.gpio, 30240000.gpio:
gpio-141 ( |spi1 CS0 ) out hi ACTIVE LOW
gpio-149 ( |wlf,mute ) out hi ACTIVE LOW
root@imx8mmevk:~#

command to toggle led:-

root@imx8mmevk:~# gpioset gpiochip2 20=1
root@imx8mmevk:~# gpioset gpiochip2 20=0
root@imx8mmevk:~# gpioset gpiochip2 20=1

How to find boot logs?

How to check sdma firmware??

Please help!!!!

[vivek338 · Accepted solution]

Hi @Sanket_Parekh 

Issue resolved by disabling sound-card in kernel menu-config.