Re: [PATCH v2 05/10] arm64: dts: rockchip: rk3568: add XPCS and fixed-clock nodes

[Andrew Lunn]

> During my tests, I found that the 125 MHz clocks (`xpcs_gmac0_clk` /
> `xpcs_gmac1_clk`) are actually outputs of the Naneng Combo PHY
> (SerDes) when it's initialized for SGMII/QSGMII mode, rather than
> independent board-level oscillators.

Do you have documentation for these Combo PHYs? Can these clocks be
enabled/disabled? And how is the Combo PHY fed with a clock? Does it
have an external oscillator/crystal?

     Andrew