Hello, I want to add spi slave support on a imx8qmlpddr4arm2 board. I added the slave entry on dts file but I do not understand if I have to change something in the pins configuration. Do I have to specify in the dts that the chip select must be set as input?
This is the pin description used for spi master mode:
pinctrl_lpspi0: lpspi0grp {
fsl,pins = <
SC_P_SPI0_SCK_DMA_SPI0_SCK 0x0600004c
SC_P_SPI0_SDO_DMA_SPI0_SDO 0x0600004c
SC_P_SPI0_SDI_DMA_SPI0_SDI 0x0600004c
>;
};
pinctrl_lpspi0_cs: lpspi0cs {
fsl,pins = <
SC_P_SPI0_CS0_LSIO_GPIO3_IO05 0x21
>;
};
&lpspi0 {
#address-cells = <1>;
#size-cells = <0>;
fsl,spi-num-chipselects = <1>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lpspi0 &pinctrl_lpspi0_cs>;
cs-gpios = <&gpio3 5 GPIO_ACTIVE_LOW>;
status = "okay";
spi:spi@0 {
spi-max-frequency = <0x7a120>;
reg = <0x0>;
compatible = "linux,spimaster";
};
};
What are the modifications I need to apply for slave mode?
Thank you in advance, I am new to dts files.
