Hello @all,
i need to access the SPI interface from userspace. Unfortunally i have not been able to convince archlinux to create any /dev/spidevicename. Can anybody supply a working device tree configuartion file for this case (adding a SPI flash device was no problem)? Are there any other things to do to create the device in the dev tree?
Thanks and best regards,
Ralf
I'm not sure about arch, but in my buildroot generated file system, the trick was to mount devtmpfs to dev mount -t devtmpfs devtmpfs /dev
and the node appears.
I can check the dtsi file once I get home from work today, but it was quite straightforward..
Edit: mode -> node
trackit,
My dtsi looks like this:
imx23-olinuxino.dts:
flash: m25p80@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "sst,sst25vf064b";
spi-max-frequency = <1000000>;
reg = <0>;
};
ucontroller: spidev@1 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "linux,spidev";
spi-max-frequency = <1000000>;
reg = <1>;
};
Also, since I have 2 devices in the bus, I also added the CS to the pinmux:
imx23.dtsi:
spi2_pins_a: spi2@0 {
reg = <0>;
fsl,pinmux-ids = <
0x0182 /* MX23_PAD_GPMI_WRN__SSP2_SCK */
0x0142 /* MX23_PAD_GPMI_RDY1__SSP2_CMD */
0x0002 /* MX23_PAD_GPMI_D00__SSP2_DATA0 */
0x0032 /* MX23_PAD_GPMI_D03__SSP2_DATA3 */
0x0042 /* MX23_PAD_GPMI_D03__SSP2_DATA4 */ <- CS 1
>;
fsl,drive-strength = <1>;
fsl,voltage = <1>;
fsl,pull-up = <0>;
};