Hi,
(It seems that my previous post has been deleted)
I have an iMX6UL with 4.1.15 kernel.
I have few SPI slaves declared in dtsi file :
pinctrl_ecspi1: ecspi1grp {
fsl,pins = <
MX6UL_PAD_CSI_DATA04__ECSPI1_SCLK 0x1b0b1
MX6UL_PAD_LCD_DATA22__ECSPI1_MOSI 0x1b0b1
MX6UL_PAD_LCD_DATA23__ECSPI1_MISO 0x1b0b1
>;
};
pinctrl_ecspi1_cs: ecspi1csgrp {
fsl,pins = <
MX6UL_PAD_CSI_DATA05__GPIO4_IO26 0x17059
MX6UL_PAD_LCD_DATA05__GPIO3_IO10 0x17059
MX6UL_PAD_LCD_DATA06__GPIO3_IO11 0x17059
MX6UL_PAD_LCD_DATA07__GPIO3_IO12 0x17059
MX6UL_PAD_GPIO1_IO00__GPIO1_IO00 0x17059
>;
};
&ecspi1 {
fsl,spi-num-chipselects = <5>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1_cs>;
cs-gpios = <&gpio4 26 GPIO_ACTIVE_HIGH>, <&gpio3 10 GPIO_ACTIVE_HIGH>, <&gpio3 11 GPIO_ACTIVE_HIGH>, <&gpio3 12 GPIO_ACTIVE_HIGH> , <&gpio1 0 GPIO_ACTIVE_HIGH>;
status = "okay";
/* spidev examlpe */
spidev@0 {
compatible = "spidev";
spi-max-frequency = <30000000>;
reg = <0>;
};
spidev@1 {
compatible = "spidev";
spi-max-frequency = <30000000>;
reg = <1>;
};
spidev@2 {
compatible = "spidev";
spi-max-frequency = <30000000>;
reg = <2>;
};
spidev@3 {
compatible = "spidev";
spi-max-frequency = <30000000>;
reg = <3>;
};
spidev@4 {
compatible = "spidev";
spi-max-frequency = <30000000>;
reg = <4>;
};
};
All the SPI are working properly except "spidev@4"
spidev0.4 exist in /dev/ and when I "cat /sys/kernel/debug/gpio", I see this configuration for gpio-0 which seems correct:
gpio-0 (spi_imx ) out lo
Nevertheless, when I try a spi communication on spidev0.4, the program blocks and is in uninterruptible sleep whereas it correctly works on other spidev0.X.
I checked what's happening using an oscilloscope, I see the data sent on the SI and the clock works.
However, the CS (on gpio-0) is correctly set to 0 and stays at 0.
Did I forgot something in the dtsi file ?
