板级配置
板级设备树文件（DTSI文件）存储所有其他板级设备中相同的信息。（例如，common.dtsi、pinctrl.dtsi和 evb.dts等文件。）
common.dtsi文件在以下路径：
freelight-u-sdk/linux/arch/riscv/boot/dts/starfive/jh7110-common.dtsi文件中，spi0有以下设置。
&spi0 {
pinctrl-names = "default";
pinctrl-0 = <&ssp0_pins>;
status = "disabled";
spi_dev0: spi@0 {
compatible = "rohm,dh2228fv";
pl022,com-mode = <1>;
spi-max-frequency = <10000000>;
reg = <0>;
status = "okay";
};
};以下为上述代码中配置位的描述：
- spi-max-frequency：编辑此位以配置SPI的通信时钟频率。
- status：编辑此位以定义是否启用此模块。
EVB板级配置
pinctrl.dtsi文件包含pin控制配置。文件在以下路径：
freelight-u-sdk/linux/arch/riscv/boot/dts/starfive/jh7110-evb-pinctrl.dtsi以下代码块提供了spi0使用的pin的示例，包括tx（收发器）、rx（接收器）、clk（时钟）和cs（片选）信号。
ssp0_pins: ssp0-pins
ssp0-pins_tx {
sf,pins = <PAD_GPIO38>;
sf,pinmux = <PAD_GPI038_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-dout = <GPO_SPI0_SSPTXD>;
sf,pin-gpio-doen = <OEN_LOW>;
};
ssp0-pins_rx {
sf,pins = <PAD_GPI039>;
sf,pinmux = <PAD_GPIO39_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-doen = <OEN_HIGH>;
sf,pin-gpio-din = <GPI_SPI0_SSPRXD>;
};
ssp0-pins_clk
sf,pins = <PAD_GPI036>;
sf,pinmux = <PAD_GPIO36_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-dout = <GPO_SPI0_SSPCLKOUT>
sf,pin-gpio-doen = <OEN_LOW>;
};
ssp0-pins_cs {
sf,pins = <PAD_GPIO37>;
sf,pinmux = <PAD_GPIO37_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-dout = <GPO_SPI0_SSPFSSOUT>
sf,pin-gpio-doen = <OEN_LOW>;
};
};昉·星光 2 板级配置
pinctrl.dtsi文件包含pin控制配置。文件在以下路径：
freelight-u-sdk/linux/arch/riscv/boot/dts/starfive/jh7110-visionfive-v2.dts以下代码块提供了spi0使用的pin的示例，包括tx（收发器）、rx（接收器）、clk（时钟）和cs（片选）信号。
ssp0_pins: ssp0-pins {
ssp0-pins_tx {
sf,pins = <PAD_GPIO52>;
sf,pinmux = <PAD_GPIO52_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-dout = <GPO_SPI0_SSPTXD>;
sf,pin-gpio-doen = <OEN_LOW>;
};
ssp0-pins_rx {
sf,pins = <PAD_GPIO53>;
sf,pinmux = <PAD_GPIO53_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-doen = <OEN_HIGH>;
sf,pin-gpio-din = <GPI_SPI0_SSPRXD>;
};
ssp0-pins_clk {
sf,pins = <PAD_GPIO48>;
sf,pinmux = <PAD_GPIO48_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-dout = <GPO_SPI0_SSPCLKOUT>;
sf,pin-gpio-doen = <OEN_LOW>;
};
ssp0-pins_cs {
sf,pins = <PAD_GPIO49>;
sf,pinmux = <PAD_GPIO49_FUNC_SEL 0>;
sf,pin-ioconfig = <IO(GPIO_IE(1))>;
sf,pin-gpio-dout = <GPO_SPI0_SSPFSSOUT>;
sf,pin-gpio-doen = <OEN_LOW>;
};
};