4 - compatible should be "litex,litespi"
5 - reg: base address and length of the register set for this device
6 - litespi,max-bpw: maximum value of bits per word
7 - litespi,sck-frequency: SPI clock frequency
8 - litespi,num-cs: number of chip select lines available
12 litespi0: spi@f0005800 {
13 compatible = "litex,litespi";
14 reg = <0xf0005800 0x100>;
16 litespi,max-bpw = <8>;
17 litespi,sck-frequency = <1000000>;