Add spidev

eishishibusawa — Fri, 13 Jul 2018 06:37:22 GMT

Dear Sir

Cuatomer is using MCIMX8M-EVK and BSP L4.9.88_2.0.0 to evaluate.

Customer want to add "spidev" to the device tree.

Original device tree

ecspi@30820000 {

compatible = "fsl,imx6ul-ecspi", "fsl,imx51-ecspi";

reg = <0x0 0x30820000 0x0 0x10000>;

interrupts = <0x0 0x1f 0x4>;

clocks = <0x4 0x18d 0x4 0x18d>;

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

interrupt-parent = <0x1>;

status = "disabled";

};

(Customer) Modified device tree

ecspi@30820000 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_spi1>;

status = "okay";

cs-gpios = <&gpio5 9 1>, <&gpio3 2 1>;

#address-cells = <1>;

#size-cells = <0>;

spidev: spidev@0 {

compatible = "spidev";

status = "okay";

spi-max-frequency = <5000000>;

reg = <0>;

};

The "spidev @ 0" was confirmed under "/sys/firmware/devicetree/base/ecspi@30820000/".

On the other hand, the "spidev" cannot be registered in "/dev/".

Customer set up the following in menuconfig and built the kernel.

Device Drivers --->

[*] SPI support --->

　　　<*> User mode SPI device driver support

How can we register "spidev" under "/div/"?

Best Regards,

Eishi SHIBUSAWA

Re: Add spidev

eishishibusawa — Tue, 17 Jul 2018 08:38:26 GMT

Dear NXP support member

Please reply this question.

Best Regards,
Eishi SHIBUSAWA

Re: Add spidev

jimmychan — Tue, 17 Jul 2018 17:01:47 GMT

First, you don't need to modify the fsl-imx8mq.dtsi.

Then add the &ecspi1 in your dts file.

You can take the "&ecspi1" in the following dts file for reference.

Example : http://git.freescale.com/git/cgit.cgi/imx/linux-imx.git/tree/arch/arm/boot/dts/imx6ul-14x14-ddr3-arm2.dts?h=imx_4.9.11_1.0.0_ga

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