linux-kernel - Re: [PATCH 1/2] soc: qcom: ice: enable ICE clock scaling API

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Message-ID: <aR7pg7shC32YD2n7@hu-arakshit-hyd.qualcomm.com>
Date: Thu, 20 Nov 2025 15:42:19 +0530
From: Abhinaba Rakshit <abhinaba.rakshit@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/2] soc: qcom: ice: enable ICE clock scaling API

On Mon, Oct 06, 2025 at 12:14:57PM +0200, Konrad Dybcio wrote:
> On 10/1/25 1:38 PM, Abhinaba Rakshit wrote:
> > Add ICE clock scaling API based on the parsed clk supported
> > frequencies from dt entry.
> > 
> > Signed-off-by: Abhinaba Rakshit <abhinaba.rakshit@....qualcomm.com>
> > ---
> 
> [...]
> 
> > +	prop = of_get_property(dev->of_node, "freq-table-hz", &len);
> > +	if (!prop || len < 2 * sizeof(uint32_t)) {
> > +		dev_err(dev, "Freq-hz property not found or invalid length\n");
> > +	} else {
> > +		engine->min_freq = be32_to_cpu(prop[0]);
> > +		engine->max_freq = be32_to_cpu(prop[1]);
> > +	}
> 
> As I suggested in <fca8355e-9b34-4df1-a7e6-459bdad8b1ff@....qualcomm.com>,
> you should really use an OPP table if you want to do any sort of clock
> scaling here.
> 
> There are then nice APIs associated with that construct that won't make
> you pull your hair out..

Sure, will move the solution to patchset v2.

> 
> Konrad