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求助：AM437X的SPI2无法正常工作，搞不定了

Peng Zhang2
Intellectual 330 points 


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；

  • 0
    Intellectual 330 points

    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>;
		};
};
  • 0 回复 Peng Zhang2
    Intellectual 330 points 
    &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>;
		};
};