How to modify non-continuous clock of spi to continuous clock on xavier?

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hello,

Our device tree setting as following, and clock will separate to two parts.
I also use “nvidia,clock-always-on;” but not work.

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";
	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 = "disabled";
	status = "okay";
	slb9670@0 {
		compatible = "infineon,slb9670";
		reg = <0>;// CE1 
		spi-max-frequency = <500000>;
		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 = <0x1f>;
		interrupt-parent = <&tegra_main_gpio>;
		interrupts = <TEGRA194_MAIN_GPIO(P, 6) 0>;
		status = "okay";
	};
      };

pinmux as fllowing

pinmux.0x0243d040 = 0x00000400; # spi1_sck_pz3: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d020 = 0x00000450; # spi1_miso_pz4: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d058 = 0x00000400; # spi1_mosi_pz5: rsvd1, pull-down, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d010 = 0x00000400; # spi1_cs0_pz6: rsvd1, pull-up, tristate-enable, input-enable, lpdr-disable
pinmux.0x0243d050 = 0x00000400; # spi1_cs1_pz7: rsvd1, pull-up, tristate-enable, input-enable, lpdr-disable

How to modify non-continuous clock of spi to continuous clock on Xavier?

Thank you very much!

2

Did you run in slave mode?

3

Hello,

How do I know I run slave mode or not?
Do you mean CONFIG_SPI_MASTER in menuconfig?

Thank you very much!

4

Please have a reference to the document for the spi slave.

[url]https://github.com/arter97/android_kernel_nvidia_shieldtablet/blob/master/Documentation/devicetree/bindings/spi/nvidia%2Cspi-slave-tegra124.txt[/url]

5

In my case, Xavier is master and device is slave.

6

@Emily
No sure if you told about the SPI continuous mode that only working for slave mode.

7

Hello ShaneCCC,

refer to following topic
https://devtalk.nvidia.com/default/topic/1037334/jetson-tx2/how-to-modify-continuous-clock-of-spi-to-non-continuous-clock-on-tx2-/

our spi clock is non-continuous as the second picture.
and we need continuous clock as the first picture.

you mean we cannot get continuous clock when we use xavier as SPI master?

Thank you very much!

8

Hello ShaneCCC,

Another question. SPI has three mode including polling, interrupt, and dma mode.
Does Xavier support polling mode? If yes, How do I setup polling mode?

Thank you very much!

9

Hi
You can enable these features: nvidia,polling-mode, nvidia,disable-runtime-pm
Have a check the document from the kernel source.
…/kernel/kernel-4.9/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt

10

Hello ShaneCCC,

I had enable polling-mode, nvidia,disable-runtime-pm before and they didn’t work.

But Good news! Our slb9670 works now.

Thanks a lot!

Best Wishes,
Emily

11

Hi Emily1_Lee,

Would you share yours pinmux and dtsi for slb9670? I can’t run it on my Xavier board. Thanks.

12

If you still the same trace log you may need to probe the signal to make sure the output is as MIPI spec.

13

Hi Emily1_Lee,

Can you provide information how to resolve the problem?
Is it resolved by making continuous clock and how to make it?
Appreciate any information you can provide, and it will also be
great if you can provide the pinmux and dtsi for slb9670.

Thanks.

Walter