hardware: imx6ull
kernel: kernel 4.19.35
in custom board, i use ecspi1 controller two devices, dts as follow:
ecspi1 {
fsl,spi-num-chipselects = <2>;
cs-gpios = <
&gpio5 9 0
&gpio3 5 0
>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1_1 &pinctrl_ecspi1_spi0 &pinctrl_ecspi1_spi1>;
status = "okay";
spi0: spidev0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "rohm,dh2228fv";
spi-max-frequency = <20000000>;
reg = <0>;
};
spi1: spidev1 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "rohm,dh2228fv";
spi-max-frequency = <20000000>;
reg=<1>;
};
};
when kernel start, i use app operate spidev1 to read devid, it's failed to get it in first time, and soon on i read it again, it's always ok. only first read error.
when kernel start, i read spidev0 devid in first time, it's always ok contain first time. wha't wrong with it, help me
i use logic analyize the wave when first read spidev1, wave form as follow:
please ignore mosi, before operate ecspi1, i config spi works mode3, but i found CLK is low in idle in first transfer, again test wave about spidev1, i can read fine devid, CLK wave is high in idle about its wave, what's wrong with it at first time, please help me, thanks
