MA35D1 SPI Device Tree

路徑 : ~/yocto/build/tmp-glibc/work-shared/numaker-iot-ma35d16f90/kernel-source/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi

	spi0: spi@40600000 {
		compatible = "nuvoton,ma35d1-spi";
		reg = <0x0 0x40600000 0x0 0x10000>;
		interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
		clocks = <&clk SPI0_GATE>;
		dmas = <&pdma1 4>,<&pdma1 5>;
		dma-names = "tx","rx";
		pdma_reqsel_tx = <60>;
		pdma_reqsel_rx = <61>;
		use_pdma = <0>;
		num_cs = <2>;
		lsb = <0>;
		sleep = <0>;
		txbitlen = <8>;
		bus_num = <2>;
		spimode = <0>;
		mrxphase = <0>;
		spi-max-frequency = <10000000>;
		status = "disabled";

	};

路徑 : ~/yocto/build/tmp-glibc/work-shared/numaker-iot-ma35d16f90/kernel-source/arch/arm64/boot/dts/nuvoton/ma35d1-iot-512m.dts

CS = PG0

CLK = PB9

MOSI = PL14

MISO =PL15

使用PDMA 所以下面給1

速度最高給12M (後面會蓋掉前面設定!)

&spi0 {
	status = "okay";
	pinctrl-names = "default";
	use_pdma = <1>;
	spi-max-frequency = <30000000>;
	pinctrl-0 = <&pinctrl_spi0>;
	spidev@0 {
		compatible = "spidev";
		reg = <0>;
		spi-max-frequency = <12000000>;
	};
	
	
};


&pinctrl {

	spi0 {
		pinctrl_spi0: spi0grp{
			nuvoton,pins =
				<SYS_GPG_MFPL_PG0MFP_SPI0_SS0    &pcfg_default>,
				<SYS_GPB_MFPH_PB8MFP_SPI0_SS1    &pcfg_default>,
				<SYS_GPB_MFPH_PB9MFP_SPI0_CLK    &pcfg_default>,
				<SYS_GPL_MFPH_PL14MFP_SPI0_MOSI    &pcfg_default>,
				<SYS_GPL_MFPH_PL15MFP_SPI0_MISO    &pcfg_default>;
		};
	};

};

電路圖

Linux Driver:

路徑 : ~/yocto/build/tmp-glibc/work-shared/numaker-iot-ma35d16f90/kernel-source/drivers/spi

static int nuvoton_spi_data_xfer(struct nuvoton_spi *hw, const void *txbuf,
                                 void *rxbuf, unsigned int len)
{
...
}

Linux Application:

環境上預設並沒有開啟spidev (decice node for user)須經由以下流程開啟:

APP:

採用NUC980的 app https://github.com/OpenNuvoton/NUC980_Linux_Applications/blob/master/demos/spi/spidev_test.c

APP Makefile

.SUFFIXES : .x .o .c .s

STRIP := aarch64-poky-linux-strip

#TARGET = spidev_test

#SRCS := spidev_test.c


all:
#	$(CC) $(SRCS) -o $(TARGET) 


clean:
	rm -f *.o
	rm -f *.x
	rm -f *.flat
	rm -f *.map
	rm -f temp
	rm -f *.img
	rm -f $(TARGET)
	rm -f *.gdb

Application 執行結果