Re: [PATCH v3 08/12] clk: qcom: ipq-cmn-pll: Add EPHY-RAW clock support

[Jie Luo]

On 9/3/2026 9:08 PM, Abel Vesa wrote:
> On 26-08-14 05:48:18, Luo Jie wrote:
>> The EPHY-RAW clock is an IPQ5210-specific output from the CMN PLL that
>> provides the raw reference clock to the SoC-integrated Ethernet PHY
>> (EPHY), which supports up to 2.5G link speed. The output frequency is
>> selected via bit 10 (CMN_PLL_GEPHY_312P5M_125M_SEL) of the
>> CMN_PLL_PON_CONFIG register:
>>
>> - 0: 125 MHz   - for 1G/100M/10M link speed
>> - 1: 312.5 MHz - for 2.5G link speed
>>
>> Parent it on cmn_pll_div2, like the rest of IPQ5210's output clocks,
>> for clock-tree consistency. This is functionally identical: the
>> output rate is purely register-bit-selected and never depends on the
>> parent rate.
> 
> So it is not a slice of the cmn_pll_div2 then. What is the actual source
> of it then, in HW?

Thanks for pointing this out. The wording is confusing. The EPHY-RAW
clock is sourced from the CMN PLL /2 path in hardware, but its output
rate is selected by the PLL/MUX logic controlled by
CMN_PLL_GEPHY_312P5M_125M_SEL.

I will drop the “never depends on the parent rate” wording to avoid
implying that it is not sourced from cmn_pll_div2.