How to enable spi2 with R32.3.1

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

Hi,

I use nano with emmc and our carrierboard.
(tegra210-p3448-0002-p3449-0000-b00.dtb)

I would like to enable spi2.

Jetson Nano Signal Name 40 Pin Header Ball Name
SPI1_MOSI 37 SPI2_MOSI
SPI1_MISO 22 SPI2_MISO
SPI1_SCK 13 SPI2_SCK
SPI1_CS0* 18 SPI2_CS0
SPI1_CS1* 16 SPI2_CS1

I follwed this links below.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%2520Linux%2520Driver%2520Package%2520Development%2520Guide%2Fhw_setup_jetson_io.html

https://devtalk.nvidia.com/default/topic/1068583/jetson-nano/jetpack-4-3-l4t-r32-3-1-released/post/5413341/#5413341

I ran sudo /opt/nvidia/jetson-io/jetson-io.py ,but nothing happened.

Thanks!

2

Did you add spidev like below? Have a reference to below link to modify the device tree for it.

https://elinux.org/Jetson/TX2_SPI

spi@xxxxx{
    ....
    ....
    ....
    linux,phandle = <0x80>;
    spi@0 {
      compatible = "spidev";
      reg = <0x0>;
      spi-max-frequency = <0x1312D00>;
      nvidia,enable-hw-based-cs;
      nvidia,cs-setup-clk-count = <0x1e>;
      nvidia,cs-hold-clk-count = <0x1e>;
      nvidia,rx-clk-tap-delay = <0x1f>;
      nvidia,tx-clk-tap-delay = <0x0>;
    }; 
 };
3

Hi ShaneCCC,

Thank you for your reply.

YES!

On R32.2.1 it’s work fine.
On R32.3.1 it doesn’t need to build u-boot.bin, so I don’t know how to do.

Thanks!

4

Have a reference to below topi.

https://devtalk.nvidia.com/default/topic/1062646

5

Hi ShaneCCC,

This is for R32.2.1 & tegra210-p3448-0000-p3449-0000-a02

It needs to build u-boot.bin.

Thanks!

6

Below link was on r32.3.1

https://github.com/rt-net/JetsonNano_DT_SPI/issues/9

7

Hi ShaneCCC,

https://devtalk.nvidia.com/default/topic/1068583/jetson-nano/jetpack-4-3-l4t-r32-3-1-released/post/5425706/#5425706

The jetson-io.py is not support the eMMC of Nano.

Thanks!

8

Hi ShaneCCC,

Any update?

Thanks!

9

Due to the jetson-io not support on the emmc nano version, could you check the pin address from the TRM and use devmem2 to read it to confirm the configure is correct. Also you can write to correct configure and try the SPI function.

10

@Karis
Still can try to modify the ./kernel-dts/porg-platforms/tegra210-porg-pinmux-p3448-0000-xxx.dtsi
Change the rsvdx to spi

spi1_mosi_pc0 {
                                nvidia,pins = "spi1_mosi_pc0";
                                nvidia,function = "rsvd1";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi1_miso_pc1 {
                                nvidia,pins = "spi1_miso_pc1";
                                nvidia,function = "rsvd1";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi1_sck_pc2 {
                                nvidia,pins = "spi1_sck_pc2";
                                nvidia,function = "rsvd1";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi1_cs0_pc3 {
                                nvidia,pins = "spi1_cs0_pc3";
                                nvidia,function = "rsvd1";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi1_cs1_pc4 {
                                nvidia,pins = "spi1_cs1_pc4";
                                nvidia,function = "rsvd1";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi2_mosi_pb4 {
                                nvidia,pins = "spi2_mosi_pb4";
                                nvidia,function = "rsvd2";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi2_miso_pb5 {
                                nvidia,pins = "spi2_miso_pb5";
                                nvidia,function = "rsvd2";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi2_sck_pb6 {
                                nvidia,pins = "spi2_sck_pb6";
                                nvidia,function = "rsvd2";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi2_cs0_pb7 {
                                nvidia,pins = "spi2_cs0_pb7";
                                nvidia,function = "rsvd2";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };

                        spi2_cs1_pdd0 {
                                nvidia,pins = "spi2_cs1_pdd0";
                                nvidia,function = "rsvd1";
                                nvidia,pull = <TEGRA_PIN_PULL_DOWN>;
                                nvidia,tristate = <TEGRA_PIN_ENABLE>;
                                nvidia,enable-input = <TEGRA_PIN_DISABLE>;
                        };
11

Hi ShaneCCC,

Thank you

I will try it.

12

Hi ShaneCCC,

is Nano have pinmux config file?

is any way to configuration spi funtion, I don’t want setting spi function by devmem2 on Nano.

Thank you!

Karis

13

You can modify the dts file like below link. Also confirm it with devmem2.

https://devtalk.nvidia.com/default/topic/1051483/jetson-nano/spi-communication-on-jetson-nano/post/5354646/#5354646