STPM4RasPI for STM32MP135F-DK - SPI timeout error

[jschneider]

Hi,

I would like to integrate the STPM4RasPI with MP135F-dk. After following the https://wiki.st.com/stm32mpu/wiki/STPM4RasPI_expansion_board tutorial, I am receiving an error. 

Driver is enabled:

STPM4RasPI module is properly attached. 

Do you have any possible solutions?

Best,

Jacek

[Olivier GALLIEN]

Hi @jschneider 

,

Please confirm you are on top of release V5. 

For this last release you may also try https://wiki.st.com/stm32mpu/wiki/X-LINUX-TPM_expansion_package which have been validated on DK 135F. 

Cross-checking both article and solution may help to find the missing piece

Olivier 

[Olivier GALLIEN]

Hi @jschneider 

I also add a big warning : any wrong side connection of the TPM to RasPI connector likely lead to kill the TPM. ( high probability) 

Olivier 

[jschneider · Accepted solution]

Hi @Olivier GALLIEN ,

Instruction given in https://wiki.st.com/stm32mpu/wiki/X-LINUX-TPM_expansion_package was helpful. I had to adjust arch/arm/boot/dts/stm32mp135f-dk.dts as:

&spi5{
	pinctrl-names = "default", "sleep";
	pinctrl-0 = <&spi5_pins_a>;
	pinctrl-1 = <&spi5_sleep_pins_a>;
	cs-gpios = <&gpioh 11 0>;
	status = "okay";

	st33htpm0: st33htpm@0{
		status="okay";
		compatible = "st,st33htpm-spi";
		#address-cells = <1>;
		#size-cells = <0>;
		reg = <0>; /* CS #0 */
		spi-max-frequency = <10000000>;
	};
}; 

And then the module was successfully detected.

Going back into the https://wiki.st.com/stm32mpu/wiki/STPM4RasPI_expansion_board there is a significant difference in configuration:

&spi5{
	cs-gpios = <&gpioh 11 0>;
	status = "okay";

	st33htpm0: st33htpm@0{
		status="okay";
		compatible = "st,st33htpm-spi";
		#address-cells = <1>;
		#size-cells = <0>;
		reg = <0>; /* CS #0 */
		spi-max-frequency = <10000000>;
		};
}; 

 It is wrong and should be changed.

Best,

Jacek