linux-kernel - Re: [PATCH 0/3] opp: Add bw_factor support to adjust bandwidth dynamically

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Message-ID: <20250804111340.t62d4y2zg77rr3rp@vireshk-i7>
Date: Mon, 4 Aug 2025 16:43:40 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Cc: Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
	Stephen Boyd <sboyd@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 0/3] opp: Add bw_factor support to adjust bandwidth
 dynamically

On 01-08-25, 15:05, Krishna Chaitanya Chundru wrote:
> Currently we are fetching the OPP based on the frequency and setting
> that OPP using dev_pm_opp_set_opp().
> 
> As you are suggesting to use dev_pm_opp_set_prop_name() here.
> This what I understood
> 
> First set prop name using dev_pm_opp_set_prop_name then
> set opp dev_pm_opp_set_opp()
> 
> if you want to change above one we need to first clear using
> dev_pm_opp_put_prop_name() then again call dev_pm_opp_set_prop_name
> & dev_pm_opp_set_opp()

dev_pm_opp_set_prop_name() should be called only once at boot time and not
again later on. It is there to configure one of the named properties before the
OPP table initializes for a device. Basically it is there to select one of the
available properties for an OPP, like selecting a voltage applicable for an OPP
for a device.

-- 
viresh