linux-kernel - Re: [PATCH V3 2/2] phy: qcom-qmp-ufs: Add regulator loads for SM8650 and SM8750

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Message-ID: <761c97bb-ee90-4ace-acd3-08349831aade@oss.qualcomm.com>
Date: Fri, 22 Aug 2025 12:15:54 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: Nitin Rawat <quic_nitirawa@...cinc.com>, vkoul@...nel.org,
        kishon@...nel.org, andersson@...nel.org, konradybcio@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 2/2] phy: qcom-qmp-ufs: Add regulator loads for SM8650
 and SM8750

On 22/08/2025 11:53, Manivannan Sadhasivam wrote:
> On Wed, Aug 20, 2025 at 03:49:31AM GMT, Dmitry Baryshkov wrote:
>> On Wed, Aug 20, 2025 at 03:58:26AM +0530, Nitin Rawat wrote:
>>> Add regulator load voting support for SM8650 and SM8750 platforms by
>>> introducing dedicated regulator bulk data arrays with their load
>>> values.
>>>
>>> The load requirements are:
>>> - SM8650: vdda-phy (205mA), vdda-pll (17.5mA)
>>> - SM8750: vdda-phy (213mA), vdda-pll (18.3mA)
>>>
>>> This ensures stable operation and proper power management for these
>>> platforms where regulators are shared between the QMP USB PHY and
>>> other IP blocks by setting appropriate regulator load currents during PHY
>>> operations.
>>>
>>> Configurations without specific load requirements will continue to work
>>> unchanged, as init_load_uA remains zero-initialized when .init_load_uA
>>> is not provided.
>>
>> Can we please get configuration for the rest of the platforms?
>>
> 
> Only if the rest of the platforms require setting the load... It is not very
> clear if the older platforms share the regulators with other IPs or not.

Yes, they are usually shared. USB. PCIe and DSI frequently sit on the 
same voltage rails.


-- 
With best wishes
Dmitry