Re: [PATCH v4 0/6] Add PCIe support for Qualcomm Nord platform

[Konrad Dybcio]

On 9/21/26 8:30 AM, Qiang Yu wrote:
> On Mon, Sep 21, 2026 at 11:07:08AM +0530, Krishna Chaitanya Chundru wrote:
>> This series adds PCIe support for the Qualcomm Nord (SA8797P) platform.
>>
>> Nord has a single Gen5-capable QMP PCIe PHY block split into four
>> independently-clocked and independently-resettable ports (A/B/C/D).
>> Firmware selects the active lane topology at boot via a TCSR
>> configuration register, and the same PHY block can appear as a single
>> x16 port, x8+x8, x8+x4+x4, or x8+x4+x2+x2 depending on that mode. This
>> is similar in spirit to the Glymur multi-PHY support already posted,
>> except Nord's PHY registers are programmed by Linux rather than by
>> firmware, so this series adds the PLL, TXRXZ, PCS and PCS-lane init
>> tables along with the power-up/power-down/soft-reset sequencing needed
>> to bring each port up.
>>
>> The series also documents and wires up the qcom,nord-pcie compatible
>> (reusing the existing SA8775P PCIe controller binding), and adds a
>> CORE_CLK_CGC_DIS/AUX_PWR_DET workaround required to avoid a timing
>> convergence issue in the PCIe power domain.
>>
>> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>
> 
> Tested on Glymur CRD and Glymur QCB, devices can be enumerated.

A test of "this didn't break my completely different board" is
welcome, but looks a little confusing without you saying that
was the intent specifically - unless maybe it wasn't?

Konrad