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iMX28 enable SPI in Linux 3.10

Question asked by Silvia Gonzalez on Jan 28, 2015
Latest reply on Jan 30, 2015 by alejandrolozano

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.

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