Have a question for ORIN NX SPI bus

[wangqunpj]

There are 4 mode about the SPI bus,we find the difference between ORIN NX and TX2.
For ORIN NX spi0：

1. CPOL=0;CPHA=1
   
   
2. CPOL=0;CPHA=0
   
   
3. CPOL=1;CPHA=1
   
   
4. CPOL=1;CPHA=0
   
   

For TX2:

1. CPOL=1;CPHA=1
   
   
2. CPOL=1;CPHA=0

The question is :
For TX2:
when CPOL=1;CPHA=0, the clk is always High when it is idle.
when CPOL=1;CPHA=1, the clk is always High when it is idle.
But for ORIN NX,
when CPOL=1;CPHA=0, the clk transfer Low to High and High to Low when it is idle.
when CPOL=1;CPHA=1, the clk transfer Low to High and High to Low when it is idle.
please tell us why
thanks

ps:

1. yellow is clk
2. blue is MOSI

[KevinFFF]

Could you share the pinmux of SCK when you are using the SPI mode with CPOL=1?

[wangqunpj]

spi1_sck_pz3 {
			nvidia,pins = "spi1_sck_pz3";
			nvidia,function = "spi1";
			nvidia,pull = <TEGRA_PIN_PULL_NONE>;
			nvidia,tristate = <TEGRA_PIN_DISABLE>;
			nvidia,enable-input = <TEGRA_PIN_DISABLE>;
			nvidia,io-high-voltage = <TEGRA_PIN_DISABLE>;
			nvidia,lpdr = <TEGRA_PIN_DISABLE>;
		};

When CPOL=1:

[KevinFFF]

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.
Thanks

May I know how do you switch these 4 kinds of SPI modes?

Is there any issue (wrong data received or lost) with SCK keeps low in idle when CPOL=1? Or you just want to clarify the different behavior between TX2 and Orin NX?