Enable the SPI port on MaaxBoard?

Question

The J10 (40 Pin) expansion pin header on the MaaXBoard has the ESPI port (pin 19,21,23,24), However after modify the dtb file to enable the ESPI1, then program the /dev/spidev.0.0 to read SPI device but the spi port seems not work. Check the signal waveform and didn't see any output on the SPI clock (pin 23) or CS (pin 24). The below is the modification I did on the device tree, do I need make other changes on device tree (for example pinctl) to make ESPI work?

ecspi@30820000 {

compatible = "fsl,imx8mq-ecspi", "fsl,imx51-ecspi";

reg = <0x00000000 0x30820000 0x00000000 0x00010000>;

interrupts = <0x00000000 0x0000001f 0x00000004>;

clocks = <0x00000004 0x000000c1 0x00000004 0x000000c1>;

clock-names = "ipg", "per";

status = "okay";

#address-cells = <0x00000001>;

#size-cells = <0x00000000>;

channel@0 {

#address-cells = <0x00000001>;

#size-cells = <0x00000000>;

#compatible = "spidev";

compatible = "rohm,dh2228fv";

reg = <0x00000000>;

spi-max-frequency = <0x016e3600>;

};

gonewtinwind · Answer

hi all jafoste4 this file is wrong, I fixed before whwn i used a spi rtc board, the ecsp1_ss0 is gpio5.io9 not io13 . I told avent technical supporter before https://github.com/Avnet/linux-imx/blob/maaxboard_4.14.78_1.0.0_ga/arch/arm64/boot/dts/freescale/maaxboard-extended-gpio.dtsi -------------------- read here for reference: https://community.nxp.com/t5/i-MX-Processors/how-to-make-spi-interface-rtc-function-work-for-imx8mq-maaxboard/m-p/116701… the issue is in the file you gave to me the spi cs pin is wrong it should change to cs-gpios = <&gpio5 9 0 > ; from cs-gpios = <&gpio5 13 0 > ; I checked the imx8mq processor hardware datasheet the ecsp1_ss0 is gpio5.io9 not io13 . the gpio5.io13 is ecsp2 _ss0 , wrong at here. correct: &ecspi1{ fsl, spi -num-chipselects = < 1 >; cs-gpios = <&gpio5 9 0 > ; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_ecspi1 >; status = "okay"; #address-cells=<1>; #size-cells=<0>; rtc@0x00{ #address-cellss=<1>; #size-cells=<1>; compatible = "rtc-m41t93"; spi -max-frequency = <5000000>; reg = <0>; }; };

Enable the SPI port on MaaxBoard?

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