Re: [PATCH v2 0/3] phy: qcom: qmp-pcie: Add vdda-refgen supply support for Glymur

[Konrad Dybcio]

On 6/29/26 2:14 PM, Qiang Yu wrote:
> On Mon, Jun 29, 2026 at 12:51:55PM +0200, Konrad Dybcio wrote:
>> On 6/23/26 3:05 PM, Qiang Yu wrote:
>>> The PCIe QMP PHYs on Glymur require both refgen for stable reference
>>> voltage and qref for stable reference clock. The refgen requires two power
>>> supplies: vdda-refgen0p9 and vdda-refgen1p2.
>>>
>>> can be extended in the future.
>>>
>>> This series creates a Glymur-specific supply list including the refgen
>>> supplies and updates both Gen5x4 and Gen4x2 configurations to use it.
>>>
>>> Signed-off-by: Qiang Yu <qiang.yu@xxxxxxxxxxxxxxxx>
>>>
>>> Changes in v2:
>>> - Add dts patch in this series.
>>> - Reword commit msg of dtbinding patch.
>>> - Link to v1: https://lore.kernel.org/all/20260208-refgen-v1-0-87ca84fd78b3@xxxxxxxxxxxxxxxx/ 
>>>
>>> ---
>>
>> Is this necessary (for Glymur) now that we correlated some of the
>> TCSR clocks with the right nodes?
> 
> This patch is necessary for glymur and mahua and other Qualcomm targets,
> which can be verified from the REFGEN page and power grid page on ipcat.
> 
> Take Glymur PCIe3 PHY as an example: it requires two REFGENs — REFGEN0 for
> the PHY itself and REFGEN4 for QREF. In the TCSR driver, only the LDOs for
> REFGEN4 are voted, not REFGEN0. This is intentional: each consumer is
> responsible for voting the LDOs of the REFGEN it uses. Since QREF uses
> REFGEN4, the TCSR driver votes the REFGEN4 LDOs; since the PHY uses
> REFGEN0, the PHY driver votes the REFGEN0 LDOs.
> 
> For some PHY instances in power grid, you can only see one REFGEN, that
> indicates the phy doesn't require QREF or the phy and the QREF it requires
> share same REFGEN.
>>
>> Perhaps this would be necessary for Mahua since its clocks don't
>> require QREF (or we can lie about it and handle them there)?
> 
> For Mahua PCIe5 PHY, it doesn't require QREF. So we don't need to vote
> REFGEN LDOs for QREF in tcsr driver. But the PHY requires REFGEN. So we
> still need to vote in PHY driver.

OK, I think I got my mental model of all of this straight. But expect
me to make more mistakes and sorry for that!

Konrad