STM32MP135 – SPI5 transfer timed out using spidev_test

[Midhul_Pk]

I’m working on an STM32MP135 (STM32MP13‑DISCO) using Yocto/OpenSTLinux 5.15 and trying to get SPI5 working via the spidev interface. My device tree configures SPI5 pins and enables spidev@0 at 500 kHz (see DTS fragment below). /dev/spidev0.0 appears on boot.

For testing, I have physically connected MOSI to MISO for loopback, and CS (PH11) is connected to the peripheral and can be pulled low. I run the loopback command:

./spidev_test -D /dev/spidev0.0 -s 500000 -v

However, the transfer fails with:

spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
[ 494.413391] spidev spi0.0: SPI transfer timed out
[ 494.416807] spi_master spi0: failed to transfer one message from queue
can't send spi message: Connection timed out
Aborted (core dumped)

I have confirmed:

• Device tree compiles without errors.

• /dev/spidev0.0 exists and matches my DT config.

• Avoided “-l” (SPI_LOOP) mode, which is unsupported by STM32.

• Still timed out in a simple loopback.

My device tree for Spidev is gevin below

&pinctrl {
 spi5_pins_b: spi5-pins-b {
 pins {
 pinmux = <STM32_PINMUX('H', 7, AF5)>, /* SPI5_SCK */
 <STM32_PINMUX('A', 8, AF5)>, /* SPI5_MISO */
 <STM32_PINMUX('H', 3, AF5)>; /* SPI5_MOSI */
 bias-disable;
 drive-push-pull;
 slew-rate = <1>;
 };
 };

 spi5_sleep_pins_b: spi5-sleep-pins-b {
 pins {
 pinmux = <STM32_PINMUX('H', 7, ANALOG)>,
 <STM32_PINMUX('A', 8, ANALOG)>,
 <STM32_PINMUX('H', 3, ANALOG)>;
 };
 };
};

&spi5 {
 pinctrl-names = "default", "sleep";
 pinctrl-0 = <&spi5_pins_b>;
 pinctrl-1 = <&spi5_sleep_pins_b>;
 cs-gpios = <&gpioh 11 GPIO_ACTIVE_LOW>; 
 status = "okay";

 spidev@0 {
 compatible = "rohm,dh2228fv";
 reg = <0>;
 spi-max-frequency = <500000>;
 status = "okay";
 };
};

how to solve this issue? any Solutions ?

[JL7]

I used this setting with a small modification and it worked, the AF should be 6

 pinmux = <STM32_PINMUX('H', 7, AF6)>, /* SPI5_SCK */

 Otherwise the clock doesn't work.