Error activating SPI5 using Buildroot external configuration

[AMill.9]

I'm using the STM32MP157F-DK2-ND evaluation board and getting an error when I try to enable SPI5.

I have researched previous posts with this error

https://community.st.com/s/question/0D53W000006FjAUSA0/error-activating-spi-module-in-yocto-linux-project

https://community.st.com/s/question/0D53W00000GZlRVSA1/enabling-devspidevxx-on-openstlinux

https://community.st.com/s/question/0D53W00000RS3ynSAD/how-can-i-enable-spi5-on-stm32mp157dk1

And reviewed relevant documentation

https://wiki.st.com/stm32mpu/wiki/How_to_use_SPI_from_Linux_userland_with_spidev

https://wiki.st.com/stm32mpu/wiki/SPI_overview

https://wiki.st.com/stm32mpu/wiki/SPI_device_tree_configuration

I've also ensured these options are checked in make linux-menuconfig

https://wiki.st.com/stm32mpu/wiki/SPI_overview#Kernel_configuration

Still, I cannot figure out why the clock isn't running.

[ 1.533147] spi_stm32 44009000.spi: clk rate = 0               

[ 1.536942] spi_stm32: probe of 44009000.spi failed with error -22  

 I 'm using the buildroot config: st_stm32mp157f_dk2_demo_defconfig provided by github buildroot-external-st repository (new member so can't add link)

After generating from CubeMX I added the following user code in my linux-dts and uboot-dts files:

&spi5{

pinctrl-names = "default", "sleep";

pinctrl-0 = <&spi5_pins_mx>;

pinctrl-1 = <&spi5_sleep_pins_mx>;

 cs-gpios= <&gpiof 6 0>;

status = "okay";

/* USER CODE BEGIN spi5 */

 spidev@0{

  compatible = "linux,spidev";

  reg = <0>;

  spi-max-frequency = <4000000>;

 };

/* USER CODE END spi5 */

};

I also ensured:

CLK_SPI2S23_PLL3Q

CLK_SPI45_PCLK2

are set in my tfa-dts file

I ensured these settings are getting built correctly by downloading the output from:

output/build/linux-custom/

I would appreciate help to troubleshoot this and any debug tools I can use to figure out this issue. Thanks!

[AMill.9]

Should I try to do a minimal build with only SPI5 enabled instead of all this other crap?

[AMill.9]

PLEASE can I get some help? I will even pay. I need to get this working asap as it's holding up the project.

[Kevin HUBER · Accepted solution]

Hello @AMill.9​ ,

I can see that you are using:

+	compatible = "linux,spidev";

In the spidev.c it is indicated:

	/*
	 * spidev should never be referenced in DT without a specific
 	 * compatible string, it is a Linux implementation thing
 	 * rather than a description of the hardware.
 	 */
 	WARN(spi->dev.of_node &&
 	     of_device_is_compatible(spi->dev.of_node, "spidev"),
 	     "%pOF: buggy DT: spidev listed directly in DT\n", spi->dev.of_node);

And below you have the list of compatible field possible in a DT:

static const struct of_device_id spidev_dt_ids[] = {
	{ .compatible = "rohm,dh2228fv" },
	{ .compatible = "lineartechnology,ltc2488" },
	{ .compatible = "semtech,sx1301" },
	{ .compatible = "lwn,bk4" },
	{ .compatible = "dh,dhcom-board" },
	{ .compatible = "menlo,m53cpld" },
	{ .compatible = "cisco,spi-petra" },
	{ .compatible = "micron,spi-authenta" },
	{},

You must use one of these compatible fields in your DTS to have spidev functional.

And be sure to have enabled these linux configurations described in the wiki: https://wiki.st.com/stm32mpu/wiki/SPI_overview#Kernel_configuration

Hope it helps,

Best regards,

Kevin

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