求助：AM437X的SPI2无法正常工作，搞不定了

网上找了很多问题贴，已经搞不清PIN的设置了。以下是我的设置，可以排除其他引脚功能占用。

spi2_pins_default: spi2_pins_default {
		pinctrl-single,pins = <
			0x260 (PIN_INPUT_PULLUP | INPUT_EN | MUX_MODE0) /* spi_sclk */0x264 (PIN_OUTPUT_PULLUP | MUX_MODE0) /* spi_MOSI */0x268 (PIN_INPUT_PULLUP | MUX_MODE0)  /* spi_MISO */0x26c (PIN_OUTPUT_PULLUP | MUX_MODE0) /* spi_cs*/
		>;
	};

	/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
	spi2_pins_sleep: spi2_pins_sleep {
		pinctrl-single,pins = <
			0x260 (PIN_INPUT_PULLUP | INPUT_EN | MUX_MODE0) /* spi_sclk */0x264 (PIN_OUTPUT_PULLUP | MUX_MODE0) /* spi_MOSI */0x268 (PIN_INPUT_PULLUP | MUX_MODE0)  /* spi_MISO */0x26c (PIN_OUTPUT_PULLUP | MUX_MODE0) /* spi_cs*/
		>;
	};

&spi2 {
		compatible = "ti,am4372-mcspi","ti,omap4-mcspi";
		reg = <0x481a2000 0x400>;
		interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;
		ti,hwmods = "spi2";
		#address-cells = <1>;
		#size-cells = <0>;
		status = "okay";
		pinctrl-names = "default", "sleep";
		pinctrl-0 = <&spi2_pins_default>;
		pinctrl-1 = <&spi2_pins_sleep>;
		spidev@0{compatible= "linux,spidev";reg= <0>;spi-max-frequency = <10000000>;
		};
};

目前情况：在/dev下有spidev1.0，spidev_test能正常运行，但接收数据全为0。示波器能检测到时钟CLK，信号正确；MISO、MOSI、CS无信号；

Peng Zhang2：

自己结帖！

原因：TI默认D0为MISO，D1为MOSI，修改dts文件，再加上cs选择就可以了。

&spi2 {compatible = "ti,am4372-mcspi","ti,omap4-mcspi";reg = <0x481a2000 0x400>;#interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;ti,hwmods = "spi2";
 ti,pindir-d0-out-d1-in = <1>; ti,spi-num-cs = <2>;#address-cells = <1>;#size-cells = <0>;status = "okay";pinctrl-names = "default";pinctrl-0 = <&spi2_pins_default>;spidev@0{compatible= "rohm,dh2228fv";reg= <0>;spi-max-frequency = <48000000>;};
};

Peng Zhang2：

回复 Peng Zhang2:

&spi2 {compatible = "ti,am4372-mcspi","ti,omap4-mcspi";reg = <0x481a2000 0x400>;#interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_HIGH>;ti,hwmods = "spi2";ti,pindir-d0-out-d1-in = <1>;ti,spi-num-cs = <2>;#address-cells = <1>;#size-cells = <0>;status = "okay";pinctrl-names = "default";pinctrl-0 = <&spi2_pins_default>;spidev@0{compatible= "rohm,dh2228fv";reg= <0>;spi-max-frequency = <48000000>;};
};