topic Re: IMX8MM PCIE CLK OUT in i.MX Processors

IMX8MM PCIE CLK OUT

story — Sun, 20 Feb 2022 14:30:19 GMT

Hello，

we are using imx8mm chip, bsp 5.4.3.

we need to use pcie to output 100mhhz clk, we see that evk all use other ic output, is there any related patch provided, I saw the forum by related posts, also The register test corresponding to the parameter setting, the unit cannot output clk.

Re: IMX8MM PCIE CLK OUT

Yuri — Mon, 21 Feb 2022 02:36:48 GMT

@story
Hello,

please look at the following:

https://community.nxp.com/t5/i-MX-Processors/imx8mm-pcie-ref-clock/m-p/994867

Regards,
Yuri.

Re: IMX8MM PCIE CLK OUT

story — Mon, 21 Feb 2022 10:07:26 GMT

Hi，

I refer to that and write the corresponding register, but clk has no output.

code:

/* Configure the PHY to output the refclock via pad */
writel(ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
writel(ANA_PLL_CLK_OUT_TO_EXT_IO_SEL,
imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG062);
writel(AUX_PLL_REFCLK_SEL_SYS_PLL,
imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063);
value = ANA_AUX_RX_TX_SEL_TX | ANA_AUX_TX_TERM;
writel(value | ANA_AUX_RX_TERM_GND_EN,
imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG064);
writel(ANA_AUX_RX_TERM | ANA_AUX_TX_LVL,
imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG065);