How can i enable SPI5 on STM32MP157-DK1

[MÇerçi]

Hi,

Im working with STM32MP157A-DK1 board. Im working on the linux side, need to write C/C++ code for saving data into a SD card. I need to use SPI to get data from RF transceiver. I built linux and kernel as in this link:

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Develop_on_Arm%C2%AE_Cortex%C2%AE-A7/Modify,_rebuild_and_reload_the_Linux%C2%AE_kernel

Then i looked for articles on SPI, these ones especially :

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

https://wiki.st.com/stm32mpu/wiki/How_to_use_SPI_from_Linux_userland_with_spidev#pnl-glhvfb87ri

https://wiki.st.com/stm32mpu/wiki/SPI_device_tree_configuration#How_to_configure_the_DT_using_STM32CubeMX

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

https://wiki.st.com/stm32mpu/wiki/How_to_cross-compile_with_the_Developer_Package

And to be fair these are really good materials but i cant manage to be able to run spidev_test example.

i did rebuilt kernel , modules and tools ( also used make menuconfig and looked at SPI settings to make sure spi is enabled) , On the board i can see spi driver in this directory "/sys/bus/spi//drivers/" but the" devices/" directory is empty and can't see anything,

EDIT:

I did manage to activate SPI device i was editing the wrong .dts file, after editing stm32mp15x-dkxx.dtsi file i was able to see /spi0.0 device.

but i have another question now.

The GPIO pins for the MISO,MOSI and NSS how do i select them for SPI5 ?

[MÇerçi]

I did manage to activate SPI device i was editing the wrong .dts file, after editing stm32mp15x-dkxx.dtsi file i was able to see /spi0.0 device.

but i have another question now.

The GPIO pins for the MISO,MOSI and NSS how do i select them for SPI5 ?

[Olivier GALLIEN]

Hi @Mustafa Çerçi​ ,

Nice to read you are progressing.

FYI .dtsi file not supposed to be modify.

Proper WoW is to override the node property in your custom board dts.

Olivier

[MÇerçi]

@Community member​  thank you also thank you for fast reply.

but i have a another question in the dtsi i wrote spi5 segment like this:

&spi5 {
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&spi5_pins_a>;
	pinctrl-1 = <&spi5_sleep_pins_a>;
	cs-gpios = <&gpioz 3 0>;
	status = "okay";
	
	/* USER CODE BEGIN spi5 */
	
	spidev@0{
	 compatible = "spidev";	
	 reg = <0>; /* CS #0 */
	 spi-max-frequency = <1800000>;
	 };
};

my question is the gpios. this line "cs-gpios = <&gpioz 3 0>;" appears wrong to me because in the example these are for spi4 i guess but i need to use spi5 in wiki i found this:

https://wiki.st.com/stm32mpu/wiki/STM32MP157x-DKx_-_hardware_description#GPIO_expansion_connector

which pins should write in to "cs-gpios = <&gpioz 3 0>;" this function can figure it out; my guess is "cs-gpios= <&gpiof 6 0>" but im not sure