linux-kernel - Re: [PATCH v2 1/2] cpufreq: mediatek-hw: Add support for Mediatek cpufreq HW driver

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Date:   Thu, 27 Aug 2020 09:56:53 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Hector Yuan <hector.yuan@...iatek.com>
Cc:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Vinod Koul <vkoul@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Anson Huang <Anson.Huang@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
        wsd_upstream@...iatek.com
Subject: Re: [PATCH v2 1/2] cpufreq: mediatek-hw: Add support for Mediatek
 cpufreq HW driver

On 26-08-20, 20:57, Hector Yuan wrote:
> On Mon, 2020-08-24 at 15:36 +0530, Viresh Kumar wrote:
> > On 13-08-20, 15:07, Hector Yuan wrote:
> > >  CONFIG_ARM_ALLWINNER_SUN50I_CPUFREQ_NVMEM=m
> > >  CONFIG_ARM_ARMADA_37XX_CPUFREQ=y
> > > +CONFIG_ARM_MEDIATEK_CPUFREQ_HW=m
> > 
> > What about a 'default m' in Kconfig itself ?
> > OK, will update in V3.

Hector, you need to remove (or not add) the right bracket (>) before the
beginning of your lines. This makes it incredibly difficult to read.

> > > +	for (i = 0; i < LUT_MAX_ENTRIES; i++) {
> > > +		data = readl_relaxed(base + (i * LUT_ROW_SIZE));
> > > +		freq = FIELD_GET(LUT_FREQ, data) * 1000;
> > > +		volt = FIELD_GET(LUT_VOLT, data);
> > > +		if (freq != prev_freq) {
> > > +			table[i].frequency = freq;
> > > +			dev_pm_opp_add(cpu_dev, freq * 1000, volt);
> > 
> > Why are you adding OPPs here and rather why using OPP specific stuff
> > at all in the driver ?
> > yes, the opp information is read from CPU HW engine.Then add it to the CPU dev OPP one by one.  

I asked a different question, why are you adding OPPs ? You don't need the OPPs
at all in my opinion. You can just create the frequency table and that's it.

> > > +	for_each_possible_cpu(cpu) {
> > > +		cpu_np = of_cpu_device_node_get(cpu);
> > > +		if (!cpu_np)
> > > +			continue;
> > > +
> > > +		ret = of_parse_phandle_with_args(cpu_np, "mtk,freq-domain",
> > 
> > Where are bindings of this node and how does this look ?
> > Can refer to the same patch series, I split it to another patch.Each cpu will be group into one frequency domain for the CPU DVFS. 

That binding only defines "mediatek,cpufreq-hw" and not "mtk,freq-domain".

-- 
viresh