SPI slave mode(imx8mp)

[ritesh.tx]

Hi @Sudharshan,

Thanks for writing to Toradex community.

By default SPI is configured to operate in master mode. To get this in slave mode, you will need to configure spi bus in for slave mode using device tree modification.
Depending on what pins you are using you can modify spi node. Below is example for escspi1 node which is Verdin SPI_1

&ecspi1 {
    status = "okay";
    spi-slave;
    
    spidev: spidev@0 {
        compatible = "spidev";
        reg = <0>;
        spi-max-frequency = <1000000>;
        spi-cpha;
        spi-cpol;
    };
};

Additionally please do share complete OS details so that we can provide specific details.

SPI (Linux) | Toradex Developer Center

How to use SPI on Torizon | Toradex Developer Center

Also check similar post below

verdin-iMX8mp spi-slave

Our customer wants to use SPI-slave. I tried spi-slave with this device tree overlays. // SPDX-License-Identifier: GPL-2.0-or-later OR MIT /* Copyright 2020-2021 Toradex */ /dts-v1/; /plugin/; / { compatible = “toradex,verdin-imx8mp”; }; &ecspi1 { #address-cells = <0>; #size-cells = <0>; spi-slave; status = “okay”; /delete-property/cs-gpios; pinctrl-0 = <&pinctrl_ecspi1>; slave { compatible = “rohm,dh2228fv”; reg = <0>; spi-max-frequency = <10000000>; status = “okay”; }; …

Let me know if you have any queries.
Best Regards
Ritesh Kumar