linux-kernel - Re: [PATCH v2 3/3] cpufreq: qcom-nvmem: add compatible fallback for ipq806x for no SMEM

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Message-ID: <aQTI7o1HQYbQ_Pl2@smile.fi.intel.com>
Date: Fri, 31 Oct 2025 16:34:22 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Ilia Lin <ilia.lin@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, Raag Jadav <raag.jadav@...el.com>,
	linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] cpufreq: qcom-nvmem: add compatible fallback for
 ipq806x for no SMEM

On Fri, Oct 31, 2025 at 03:19:12PM +0100, Christian Marangi wrote:
> On Fri, Oct 31, 2025 at 03:26:46PM +0200, Andy Shevchenko wrote:
> > On Fri, Oct 31, 2025 at 02:08:34PM +0100, Christian Marangi wrote:

...

> > > +		if (of_machine_is_compatible("qcom,ipq8062"))
> > > +			msm_id = QCOM_ID_IPQ8062;
> > > +		else if (of_machine_is_compatible("qcom,ipq8065") ||
> > > +			 of_machine_is_compatible("qcom,ipq8069"))
> > > +			msm_id = QCOM_ID_IPQ8065;
> > > +		else if (of_machine_is_compatible("qcom,ipq8064") ||
> > > +			 of_machine_is_compatible("qcom,ipq8066") ||
> > > +			 of_machine_is_compatible("qcom,ipq8068"))
> > > +			msm_id = QCOM_ID_IPQ8064;
> > 
> > A nit-pick (in case you need a new version of the series): I would expect
> > the conditionals be sorted by assigned value.
> > 
> > 		if (of_machine_is_compatible("qcom,ipq8062"))
> > 			msm_id = QCOM_ID_IPQ8062;
> > 		else if (of_machine_is_compatible("qcom,ipq8064") ||
> > 			 of_machine_is_compatible("qcom,ipq8066") ||
> > 			 of_machine_is_compatible("qcom,ipq8068"))
> > 			msm_id = QCOM_ID_IPQ8064;
> > 		else if (of_machine_is_compatible("qcom,ipq8065") ||
> > 			 of_machine_is_compatible("qcom,ipq8069"))
> > 			msm_id = QCOM_ID_IPQ8065;
> >
> 
> Hi as said in the commit, parsing 65/69 before 64 is needed as we might
> have compatible like
> 
> "qcom,ipq8065","qcom,ipq8064" so we might incorrectly parse msm_id
> ipq8064.

Oh, this is unfortunate. Wouldn't it be possible to use some API that returns
an index (or an error if not found) of the compatible? I believe we have a such
for the regular 'compatible' properties.

-- 
With Best Regards,
Andy Shevchenko