I’m working on an STM32MP257FAK3 custom board using Yocto/OpenSTLinux and trying to get SPI1 working as 3 wire SPI via the spidev interface. My device tree configures SPI1 pins and enables spidev@0 at 1MHz, 10MHz and 500KHz. (see DTS fragment below). /dev/spidev0.0 appears on boot.
&spi1 {
pinctrl-names = "default";
pinctrl-0 = <&spi1_pins_a>;
cs-gpios = <&gpiob 11 (GPIO_ACTIVE_LOW)>;
status = "okay";
/delete-property/ power-domains;
/delete-property/ dmas;
/delete-property/ dma-names;
gh7005@0 {
compatible = "rohm,dh2228fv"; /* generic spi device for testing */
reg = <0>; /* chip select 0 */
spi-max-frequency = <1000000>; //1Mhz
spi-3wire; /* GH7005 uses 3-wire SPI */
};
};
spi1_pins_a: spi1-0 {
pins {
pinmux = <STM32_PINMUX('D', 9, AF2)>, //Mosi
<STM32_PINMUX('H', 10, AF2)>; //SCK
drive-push-pull;
bias-disable;
slew-rate = <1>;
};
};
After booting, I am getting Spi connection time out error for all cases.(500KHz, 1MHz and 10MHz).
./spidev_test -D /dev/spidev0.0 -s 1000000 -p "\xAA\x55"
spi mode: 0x0
bits per word: 8
max speed: 1000000 Hz (1000 kHz)
can't send spi message: Connection timed out
Aborted (core dumped)
Why is this error coming and how can I resolve it?
