SPIDEV errors in Petalinux 2017.1

[dima2882]

Hi all,

With Vivado/Petalinux 2017.1 I get spidev errors that are different from the others I've seen on the forum. When kernel boots up, I see this:

cdns-spi e0006000.spi: chipselect 0 already in use
spi_master spi0: spi_device register error /amba/spi@e0006000/spidev@0
spi_master spi0: Failed to create SPI device for /amba/spi@e0006000/spidev@0

I have CONFIG_SPI_SPIDEV=y set in the kernel. Additionally, my system-user.dtsi has the same stuff everyone else uses:

&spi0 {
    status = "okay";
    is-decoded-cs = <0>;
    num-cs = <1>;
	device@0 {
		compatible = "spidev";
		reg = <0>; //chipselect 0
		spi-max-frequency = <50000000>;
	};
};

I have edited the device-tree-generation_%.bbappend file in ...project-spec/meta-user/recipes-bsp/device-tree to include the system-user.dtsi. The hardware/software used has worked for Vivado/Petalinux 2016.2 in the past.

Anyone know what's going on?

[dima2882]

Made some progress - found that the kernel had a problem with the fact that I had

reg = <0>;

set for two different devices within spi0. This has not been a problem in Petalinux 2016.2 before. Now here's what I get in dmesg | grep spi:

spidev spi0.0: buggy DT: spidev listed directly in DT

My spi0 devices are ad9361-phy@0 for the AD9361 and the spidev device. There's only one chip select. What should both of these be set to? And why am I getting spi0.0 instead of spidev32766.1 the way I used to in 2016.2?

[dima2882 · Accepted solution]

I was able to solve my issues...

Thing to remember with Petalinux 2017.1 is that for whatever reason everything gets renamed - spidev numbers changed, uio numbers changed, no idea why. If the SW driver source is updated to reflect this then everything works again as it did under earlier releases.

[aynilian]

Hi dima2882

How did you set this "CONFIG_SPI_SPIDEV=y"?

[aynilian]

writing this in system-user.dtsi gives errors.

I could not use the reference &spi0. Was there more you had in the system-user.dtsi?

&spi0 {
    status = "okay";
    is-decoded-cs = <0>;
    num-cs = <1>;
	device@0 {
		compatible = "spidev";
		reg = <0>; //chipselect 0
		spi-max-frequency = <50000000>;
	};
};

[dima2882]

This is what I had:

&spi0 {

    status = "okay";
    num-cs = <1>;
    device@0 {
        spi-cpha;
        compatible = "spidev";
        reg = <0>; //chipselect 0
        spi-max-frequency = <10000000>;
    };
};

[aynilian]

Hi dima2882,

modified the system-user.dtsi which looks close to your device-tree modification.

Here is the solved post: 

https://forums.xilinx.com/t5/Embedded-Linux/can-t-acces-the-PS-SPI-with-Petalinux-2017-3/m-p/857061#M26134

Cheers!