Board Level Configuration

The board level device tree file (DTSI file) stores all differentiation information for each board-level device. (For example, common.dtsi, pinctrl.dtsi, and evb.dts, etc. )

The common.dtsi file is stored in the following path: 
freelight-u-sdk/linux/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
In the file, spi0 has the following settings. 
&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";     
        };
};
The following list provides more descriptions for the configuration bits.
  • spi-max-frequency: Edit this bit to configure the communication clock frequency of SPI.
  • status: Edit this bit to define whether this module is enabled.

VisionFive 2 Board Level Configuration

The pinctrl.dtsi file contains the pin control configuration. The file is stored in the following path:
freelight-u-sdk/linux/arch/riscv/boot/dts/starfive/jh7110-visionfive-v2.dts
The following code block provides an example of the pins used by spi0 including tx (Transceiver), rx (Receiver), clk (clock), and cs (chip select) signals. 
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>;
        };
};