@ShaneCCC
Use two xaviers, one for master and the other for slave
This is the master’s dts.
spi0: spi@3210000 {
compatible = “nvidia,tegra186-spi”;
reg = <0x0 0x03210000 0x0 0x10000>;
interrupts = <0 36 0x04>;
#address-cells = <1>;
#size-cells = <0>;
iommus = <&smmu TEGRA_SID_GPCDMA_0>;
dma-coherent;
dmas = <&gpcdma 15>, <&gpcdma 15>;
dma-names = “rx”, “tx”;
nvidia,dma-request-selector = <&gpcdma 15>;
spi-max-frequency = <65000000>;
nvidia,clk-parents = “pll_p”, “clk_m”;
clocks = <&bpmp_clks TEGRA194_CLK_SPI1>,
<&bpmp_clks TEGRA194_CLK_PLLP_OUT0>,
<&bpmp_clks TEGRA194_CLK_CLK_M>;
clock-names = “spi”, “pll_p”, “clk_m”;
resets = <&bpmp_resets TEGRA194_RESET_SPI1>;
reset-names = “spi”;
status = “okay”;
nvidia,clock-always-on;
spi@0 {
compatible = “spidev”;
reg = <0>;
spi-max-frequency = <65000000>;
status = “okay”;
};
};
This is the dts of the slave.
spi0: spi@3210000 {
compatible = “nvidia,tegra124-spi-slave”;
reg = <0x0 0x03210000 0x0 0x10000>;
interrupts = <0 36 0x04>;
#address-cells = <1>;
#size-cells = <0>;
iommus = <&smmu TEGRA_SID_GPCDMA_0>;
dma-coherent;
dmas = <&gpcdma 15>, <&gpcdma 15>;
dma-names = “rx”, “tx”;
nvidia,dma-request-selector = <&gpcdma 15>;
spi-max-frequency = <65000000>;
nvidia,clk-parents = “pll_p”, “clk_m”;
clocks = <&bpmp_clks TEGRA194_CLK_SPI1>,
<&bpmp_clks TEGRA194_CLK_PLLP_OUT0>,
<&bpmp_clks TEGRA194_CLK_CLK_M>;
clock-names = “spi”, “pll_p”, “clk_m”;
resets = <&bpmp_resets TEGRA194_RESET_SPI1>;
reset-names = “spi”;
status = “okay”;
nvidia,clock-always-on;
spi@0 {
compatible = “spidev”;
reg = <0>;
spi-max-frequency = <65000000>;
nvidia,slave-ready-gpio=<&tegra_main_gpio TEGRA194_MAIN_GPIO(T, 3) 0>;
nvidia,enable-hw-based-cs;
status = “okay”;
};
};