How to Enable SPI driver on LS1088ARDB-PB

[gsuresh_12]

I am using LS1088ARDB-PB board for my development. I am trying to interface external SPI slave device from LS1088ARDB. 

I am using flexbuild2012 package, I did not see any SPI drivers available in /dev folder in root mode.

Please suggest how to enable SPI drivers on LS1088ARDB-PB board.

Thanks & Regards

Suresh 

[yipingwang]

Please enable the following options in Linux Kernel configuration file.

CONFIG_SPI

CONFIG_SPI_FSL_DSPI

CONFIG_SPI_SPIDEV

Please define DSPI device device node in the dts file, please refer to the following.

&dspi {
bus-num = <0>;
status = "okay";

flash@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "jedec,spi-nor";
reg = <0>;
spi-max-frequency = <1000000>;
};

flash@1 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "jedec,spi-nor";
spi-cpol;
spi-cpha;
spi-max-frequency = <3500000>;
reg = <1>;
};

};

[gsuresh_12]

Hi yipingwang,

Thanks you for your reply,

I am using flexbuild_lsdk2012 source code and I am trying to identify the Kernel Configuration file to update your suggestions. But I could not able to locate the Kernel Configuration file. Could you please help me to identify the location of the Kernel Configuration file?

Thanks & Regards

Suresh 

[yipingwang]

Linux Kernel configuration file is located in flexbuild_lsdk2012/build/linux/linux/arm64/LS/output/LSDK-20.12-V5.4/.config.

Please go to folder flexbuild_lsdk2012/build/linux/linux/arm64/LS/output/LSDK-20.12-V5.4/, run command "make ARCH=arm64 menuconfig" to configure Kernel options.

Then rebuild Linux kernel with command.

$ flex-builder -c linux -a arm64

[gsuresh_12]

Hi yipingwang,

Thanks for your reply,

All of your suggestions, I could found in flexbuild_lsdk2012 already enabled and i can able to boot the board through SPI flash also.

I am planning to use another SPI port not QSPI which was already used for boot. for accessing the SPI port (not QSPI) i should able to see SPI device in "/dev" folder. I need your suggestion for to enable that SPI port to use at user space.

Thanks & Regards

Suresh  

[yipingwang]

To use spidev, please open CONFIG_SPI, CONFIG_SPI_FSL_DSPI and CONFIG_SPI_SPIDEV. 

They are have been opened in arm64 defconfig.

Moreover, dts needs to be modifed as below, under dspi node:

spidev0: spi@0 {

reg = <0>;

compatible = "rohm,dh2228fv";

spi-max-frequency = <3000000>;

}

[gsuresh_12]

Hi Yipingwang,

Still I could not able to succeeded for enabling SPI port (Not QSPI). Please suggest which dts file I need to modify for your suggested changes. I am using flexbuild_lsdk2108 package. if possible please share that modified dts file.

Regards

Suresh  

[gsuresh_12]

Hi yipingwang,

1.        I have appended below node in the file

Directory Name: /flexbuild_lsdk2108/components/linux/linux/arch/arm64/boot/dts/freescale#

File Name: fsl-ls1088a-rdb.dts

&dspi {

        status = "okay";

        bus-num = <0>;

        spidev@0 {

                compatible = "linux,spidev";

                spi-max-frequency = <12000000>;

                reg = <0>;

        };

};

1.        I have modified status from disabled to enabled as mentioned below

Directory Name: /flexbuild_lsdk2108/components/linux/linux/arch/arm64/boot/dts/freescale#

File Name: fsl-ls1088a.dtsi

                dspi: spi@2100000 {

                        compatible = "fsl,ls1088a-dspi",

                                     "fsl,ls1021a-v1.0-dspi";

                        #address-cells = <1>;

                        #size-cells = <0>;

                        reg = <0x0 0x2100000 0x0 0x10000>;

                        interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;

                        clock-names = "dspi";

                        clocks = <&clockgen 4 1>;

                        spi-num-chipselects = <6>;

                        status = "enabled";

                };

After updating these changes still i could not able to see the dspi device in the /dev tree.

Can you please help me if there is any standard procedure to add dspi (not QSPI) into the device tree and enable the device?

Thanks & Regards

Suresh