Using SPI and GPIO PWM on Jetson Nano EMMC

Autonomous Machines Jetson & Embedded Systems Jetson Nano
,
1

Hi all

I’m trying to make a device tree assembly that will allow me to use SPI1 with CS0, and I want to redefine CS1 to use GPIO (PWM)
Without setting GPIO (PWM) everything works
Here is my setup for working with SPI:

			 spi1_mosi_pc0 {
				 nvidia,pins = "spi1_mosi_pc0";
				 nvidia,function = "spi1";
				 nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
				 nvidia,tristate = <TEGRA_PIN_DISABLE>;
				 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			 };
 
			 spi1_miso_pc1 {
				 nvidia,pins = "spi1_miso_pc1";
				 nvidia,function = "spi1";
				 nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
				 nvidia,tristate = <TEGRA_PIN_DISABLE>;
				 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			 };
 
			 spi1_sck_pc2 {
				 nvidia,pins = "spi1_sck_pc2";
				 nvidia,function = "spi1";
				 nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
				 nvidia,tristate = <TEGRA_PIN_DISABLE>;
				 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			 };
 
			 spi1_cs0_pc3 {
				 nvidia,pins = "spi1_cs0_pc3";
				 nvidia,function = "spi1";
				 nvidia,pull = <TEGRA_PIN_PULL_UP>;
				 nvidia,tristate = <TEGRA_PIN_DISABLE>;
				 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			 };
 
			 spi1_cs1_pc4 {
				 nvidia,pins = "spi1_cs1_pc4";
				 nvidia,function = "spi1";
				 nvidia,pull = <TEGRA_PIN_PULL_UP>;
				 nvidia,tristate = <TEGRA_PIN_DISABLE>;
				 nvidia,enable-input = <TEGRA_PIN_ENABLE>;
			 };

#include <dt-bindings/gpio/tegra-gpio.h>

/ {
	gpio: gpio@6000d000 {
		gpio-init-names = "default";
		gpio-init-0 = <&gpio_default>;

		gpio_default: default {
			gpio-hog;
			function;
			gpios = <
				TEGRA_GPIO(C, 0) 0 
				TEGRA_GPIO(C, 1) 0 
				TEGRA_GPIO(C, 2) 0 
				TEGRA_GPIO(C, 3) 0
				TEGRA_GPIO(C, 4) 0
			>;
			gpio-input = <
				TEGRA_GPIO(BB, 0)
				TEGRA_GPIO(B, 4)
				TEGRA_GPIO(B, 5)
				TEGRA_GPIO(B, 6)
				TEGRA_GPIO(B, 7)
				TEGRA_GPIO(DD, 0)
				TEGRA_GPIO(E, 6)
				TEGRA_GPIO(S, 5)
				TEGRA_GPIO(A, 5)
				TEGRA_GPIO(X, 4)
				TEGRA_GPIO(X, 5)
				TEGRA_GPIO(X, 6)
				TEGRA_GPIO(Y, 1)
				TEGRA_GPIO(Y, 2)
				TEGRA_GPIO(V, 0)
				TEGRA_GPIO(V, 1)
				TEGRA_GPIO(Z, 0)
				TEGRA_GPIO(Z, 2)
				TEGRA_GPIO(G, 2)
				TEGRA_GPIO(G, 3)
				TEGRA_GPIO(H, 2)
				TEGRA_GPIO(H, 5)
				TEGRA_GPIO(H, 6)
				TEGRA_GPIO(I, 1)
				TEGRA_GPIO(CC, 4)
				>;
			gpio-output-low = <
				TEGRA_GPIO(S, 7)
				TEGRA_GPIO(T, 0)
				TEGRA_GPIO(Z, 3)
				TEGRA_GPIO(H, 0)
				TEGRA_GPIO(H, 3)
				TEGRA_GPIO(H, 4)
				TEGRA_GPIO(H, 7)
				TEGRA_GPIO(I, 0)
				TEGRA_GPIO(I, 2)
				>;
			gpio-output-high = <
				TEGRA_GPIO(A, 6)
				TEGRA_GPIO(X, 3)
				TEGRA_GPIO(CC, 7)
				>;
		};
	};
};

what do I need to do so that I can use pin c4 as gpio?

3

Hi ihor.sh1nkarenk000,

Are you using the devkit or custom board for Jetson Nano eMMC?
What’s your Jetpack version in use?

It seems you don’t need to configure for the above configurations.

I would suggest you configuring the pinmux through pinmux spreadsheet instead of modifying them in dts file.

5

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