Tool/software:
Hi, I'm currently working on SK-AM69 and I need to use a module which uses SPI.
I found out there are some GPIO pins that I can mux as SPI on 40-pin header.
And I want to control them on Linux(which runs at main domain) but they are WKUP domain GPIO.
Is there any way to control WKUP domain GPIO at Main domain?
Hi Tanmay,
Thank you for the quick response.
I checked out the mentioned file and I added these to device tree.
&mcu_spi0 {
status = "okay";
#address-cells = <1>;
#size-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&mcu_spi1_pins_default>;
spidev@0 {
compatible = "rohm,dh2228fv";
spi-max-frequency = <20000000>;
reg = <0>;
};
};
&wkup_pmx2 {
bootph-all;
#if 1
mcu_spi1_pins_default: mcu_spi1-default-pins {
pinctrl-single,pins = <
J784S4_WKUP_IOPAD(0x038, PIN_INPUT, 0) /* (G38) MCU_SPI0_CLK */
J784S4_WKUP_IOPAD(0x044, PIN_INPUT, 0) /* (F37) MCU_SPI0_CS0 */
J784S4_WKUP_IOPAD(0x03c, PIN_INPUT, 0) /* (H36) MCU_SPI0_D0 */
J784S4_WKUP_IOPAD(0x040, PIN_INPUT, 0) /* (J38) MCU_SPI0_D1 */
>;
};
#endif
}
When I boot up the Linux kernel, it successfully probed and device path (/dev/spidev1.0) shows up.
But when I try to test SPI communication through this device on userspace, the device freezes up and I need to force reboot it with reboot switch.
I use (https://github.com/torvalds/linux/blob/master/tools/spi/spidev_test.c) to test SPI communication.
I find out that MCU_SPI1_* pins are connected to CPLD.
Could this be causing the freeze?
Regards,
Minsoo
Hi,
I don't know much about the CPLD, all I know is that It is some kind of simplified FPGA.
MCU_SPI1_* pins are connected into CPLD and 40-pin header at same time.
(AP)MCU_SPI1_* --> MCU_BOOTMODE_* --> CPLD and 40-pin header
Regards,
Minsoo