Hi,
We are configuring 2 Chip Selects as GPIO in our device tree but they are appearing as inputs in /sys/kernel/debug/gpio
gpiochip1: GPIOs 32-63, parent: platform/30210000.gpio, 30210000.gpio:
gpio-48 ( |spi_imx ) in lo
gpio-51 ( |spi_imx ) in lo
If I configure the direction to output using devmem2 then the CS works as expected. The SPI driver is making the call to set the direction to an output but it's not working. I can't even see the direction_output function implemented in the GPIO chip driver so I'm not even sure how it sets the GPIO to an output. We are using the NXP linux-imx 5.4.24 kernel (imx_5.4.24_2.1.0 branch). Here's the device tree fragment:
&iomuxc {
pinctrl_ecspi2_cs: ecspi2cs {
fsl,pins = <
MX8MN_IOMUXC_SD2_DATA1_GPIO2_IO16 0x40000
MX8MN_IOMUXC_SD2_RESET_B_GPIO2_IO19 0x40000
>;
};
};
&ecspi2 {
fsl,spi-num-chipselects = <3>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi2 &pinctrl_ecspi2_cs>;
cs-gpios = <0>, <&gpio2 16 GPIO_ACTIVE_LOW>, <&gpio2 19 GPIO_ACTIVE_LOW>;
ra8875: ra8875@0 {
compatible = "raio,ra8875";
reg = <0>;
spi-max-frequency = <1000000>;
width = <480>;
height = <272>;
buswidth = <8>;
};
spidev1: spi@1 {
reg = <1>;
compatible = "rohm,dh2228fv";
spi-max-frequency = <5000000>;
};
spidev2: spi@2 {
reg = <2>;
compatible = "rohm,dh2228fv";
spi-max-frequency = <5000000>;
};
};
All the relevant drivers are configured in the kernel.
Any help is greatly appreciated,
Martin
