I saw this link and tried to follow it, but I’m not sure.
I proceeded in the following way to modify dts.
1.Run /opt/nvidia/jetson-io/jetson-io.py and activate spi1, spi3
2. sudo dtc -I dts -O dtb -o ~/user-custom.dts /boot/tegra194-p3668-all-p3509-0000-user-custom.dtb
3. Modify user-custom.dts
spi@3210000 {
compatible = “nvidia,tegra186-spi”;
reg = <0x0 0x3210000 0x0 0x10000>;
interrupts = <0x0 0x24 0x4>;
#address-cells = <0x1>;
#size-cells = <0x0>;
iommus = <0x2 0x20>;
dma-coherent;
dmas = <0x19 0xf 0x19 0xf>;
dma-names = “rx”, “tx”;
spi-max-frequency = <0x3dfd240>;
nvidia,clk-parents = “pll_p”, “clk_m”;
clocks = <0x4 0x87 0x4 0x66 0x4 0xe>;
clock-names = “spi”, “pll_p”, “clk_m”;
resets = <0x5 0x5b>;
reset-names = “spi”;
status = “okay”;
linux,phandle = <0xf2>;
phandle = <0xf2>;
spi@0 {
compatible = “spidev”;
reg = <0x0>;
spi-max-frequency = <0x2faf080>;
controller-data {
nvidia,enable-hw-based-cs;
nvidia,rx-clk-tap-delay = <0x10>;
nvidia,tx-clk-tap-delay = <0x0>;
};
};
spi@1 {
compatible = “spidev”;
reg = <0x1>;
spi-max-frequency = <0x2faf080>;
controller-data {
nvidia,enable-hw-based-cs;
nvidia,rx-clk-tap-delay = <0x10>;
nvidia,tx-clk-tap-delay = <0x0>;
};
};
};
spi@3230000 {
compatible = “nvidia,tegra186-spi-slave”;
reg = <0x0 0x3230000 0x0 0x10000>;
interrupts = <0x0 0x26 0x4>;
#address-cells = <0x1>;
#size-cells = <0x0>;
iommus = <0x2 0x20>;
dma-coherent;
dmas = <0x19 0x11 0x19 0x11>;
dma-names = “rx”, “tx”;
spi-max-frequency = <0x3dfd240>;
nvidia,clk-parents = “pll_p”, “clk_m”;
clocks = <0x4 0x89 0x4 0x66 0x4 0xe>;
clock-names = “spi”, “pll_p”, “clk_m”;
resets = <0x5 0x5d>;
reset-names = “spi”;
status = “okay”;
linux,phandle = <0xf4>;
phandle = <0xf4>;
spi@0 {
compatible = “spidev”;
reg = <0x0>;
spi-max-frequency = <0x2faf080>;
controller-data {
nvidia,enable-hw-based-cs;
nvidia,rx-clk-tap-delay = <0x10>;
nvidia,tx-clk-tap-delay = <0x0>;
};
};
spi@1 {
compatible = “spidev”;
reg = <0x1>;
spi-max-frequency = <0x2faf080>;
controller-data {
nvidia,enable-hw-based-cs;
nvidia,rx-clk-tap-delay = <0x10>;
nvidia,tx-clk-tap-delay = <0x0>;
};
};
};
- sudo dtc -I dts -O dtb -o /boot/tegra194-p3668-all-p3509-0000-user-custom.dtb ~/user-custom.dts
- reboot
By modifying dts in this way, spi1(master, spidev0.0), spi3(slave, spidev2.0) were connected and executed as follows.
./spidev_test -D /dev/spidev2.0 -s 150000 -n10000 -g30 -p4 -z
./spidev_test -D /dev/spidev0.0 -s 150000 -n10000 -g30 -p4 -z
(The photo shows’./spidev_test -D /dev/spidev0.0 -s 150000 -n10000 -g30 -p4 -z -r’, but When I used ‘./spidev_test -D /dev/spidev0.0 -s 150000 -n10000- g30 -p4 -z’ , the result was the same.)
The result is shown in the photo.
When I ran it in slave mode, a transfer error occurred and the master was test failed.
What did I do wrong?