iMX28 enable SPI in Linux 3.10

silviagonzalez — Wed, 28 Jan 2015 16:45:10 GMT

Hello

We’re trying to enable the SPI functionality in an iMX287 with kernel 3.10.

We’ve added the highlighted lines to the imx28-mba28.dts file:

apb@80000000 {

apbh@80000000 {

pinctrl@80018000 {

...

};

apbx@80040000 {

ssp2: ssp@80014000 {

#address-cells = <1>;

#size-cells = <0>;

compatible = "fsl,imx28-spi";

pinctrl-names = "default";

pinctrl-0 = <&spi2_pins_a>;

status = "okay";

flash: m25p80@0 {

#address-cells = <1>;

#size-cells = <1>;

compatible = "m25p80,fsl,imx28-spi";

spi-max-frequency = <40000000>;

reg = <0>;

};

But we’ve found that unless we comment the following highlighted lines in the imx28.dtsi file the compilation fails:

apb@80000000 {

apbh@80000000 {

compatible = "simple-bus";

#address-cells = <1>;

#size-cells = <1>;

reg = <0x80000000 0x3c900>;

ranges;

/*ssp2: ssp@80014000 {

#address-cells = <1>;

#size-cells = <0>;

reg = <0x80014000 0x2000>;

interrupts = <98 84>;

clocks = <&clks 48>;

dmas = <&dma_apbh 2>;

dma-names = "rx-tx";

fsl,ssp-dma-channel = <2>;

status = "disabled";

};*/

pinctrl@80018000 {

#address-cells = <1>;

#size-cells = <0>;

compatible = "fsl,imx28-pinctrl", "simple-bus";

reg = <0x80018000 0x2000>;

spi2_pins_a: spi2@0 {

reg = <0>;

fsl,pinmux-ids = <

0x2100 /* MX28_PAD_SSP2_SCK__SSP2_SCK */

0x2110 /* MX28_PAD_SSP2_MOSI__SSP2_CMD */

0x2120 /* MX28_PAD_SSP2_MISO__SSP2_D0 */

0x2130 /* MX28_PAD_SSP2_SS0__SSP2_D3 */

fsl,drive-strength = <1>;

fsl,voltage = <1>;

fsl,pull-up = <1>;

};

apbx@80040000 {

compatible = "simple-bus";

#address-cells = <1>;

#size-cells = <1>;

reg = <0x80040000 0x40000>;

ranges;

};

Once we comment these lines the compilation is successfully completed but when booting the system we get the following error:

mxs-spi: probe of ssp.5 failed with error -22

Are we missing anything? Could you help us, please?

Thanks in advance for your help.

Re: iMX28 enable SPI in Linux 3.10

fabio_estevam — Wed, 28 Jan 2015 18:08:55 GMT

Hi Silvia,

The compatible string you use is not correct.

Take a look at this dts file that shows the usage of a m25p80 spi flash on mx28:

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/arch/arm/boot/dts/imx28-m28evk.dts?id=refs/tag…

Re: iMX28 enable SPI in Linux 3.10

alejandrolozan1 — Fri, 30 Jan 2015 18:20:21 GMT

Hi,

You can also check the binding documentation.
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/Documentation/devicetree/bindings/spi/mxs-spi.…

Alejandro

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