Add below header-40pin-pinmux to your dts.
pinmux@2430000 {
pinctrl-0 = <0x179>;
pinctrl-names = "default";
compatible = "nvidia,tegra194-pinmux";
reg = <0x0 0x2430000 0x0 0x17000 0x0 0xc300000 0x0 0x4000>;
#gpio-range-cells = <0x3>;
status = "okay";
linux,phandle = <0xab>;
phandle = <0xab>;
header-40pin-pinmux {
phandle = <0x179>;
linux,phandle = <0x179>;
pin37 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x1>;
nvidia,pins = "spi3_mosi_py2";
nvidia,function = "spi3";
};
pin28 {
nvidia,lpdr = <0x1>;
nvidia,io-high-voltage = <0x1>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x0>;
nvidia,pins = "gen2_i2c_scl_pcc7";
nvidia,function = "i2c2";
};
pin27 {
nvidia,lpdr = <0x1>;
nvidia,io-high-voltage = <0x1>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x0>;
nvidia,pins = "gen2_i2c_sda_pdd0";
nvidia,function = "i2c2";
};
pin26 {
nvidia,lpdr = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x2>;
nvidia,pins = "spi1_cs1_pz7";
nvidia,function = "spi1";
};
pin24 {
nvidia,lpdr = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x2>;
nvidia,pins = "spi1_cs0_pz6";
nvidia,function = "spi1";
};
pin23 {
nvidia,lpdr = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x1>;
nvidia,pins = "spi1_sck_pz3";
nvidia,function = "spi1";
};
pin22 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x1>;
nvidia,pins = "spi3_miso_py1";
nvidia,function = "spi3";
};
pin21 {
nvidia,lpdr = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x1>;
nvidia,pins = "spi1_miso_pz4";
nvidia,function = "spi1";
};
pin19 {
nvidia,lpdr = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x1>;
nvidia,pins = "spi1_mosi_pz5";
nvidia,function = "spi1";
};
pin18 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x2>;
nvidia,pins = "spi3_cs0_py3";
nvidia,function = "spi3";
};
pin16 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x2>;
nvidia,pins = "spi3_cs1_py4";
nvidia,function = "spi3";
};
pin13 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x1>;
nvidia,pins = "spi3_sck_py0";
nvidia,function = "spi3";
};
pin10 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x1>;
nvidia,tristate = <0x1>;
nvidia,pull = <0x2>;
nvidia,pins = "uart1_rx_pr3";
nvidia,function = "uarta";
};
pin8 {
nvidia,lpdr = <0x0>;
nvidia,io-high-voltage = <0x0>;
nvidia,enable-input = <0x0>;
nvidia,tristate = <0x0>;
nvidia,pull = <0x0>;
nvidia,pins = "uart1_tx_pr2";
nvidia,function = "uarta";
};
};