linux-kernel - Re: [PATCH v4 2/4] dt-bindings: arm: mediatek: Add new bindings of MediaTek frequency hopping

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Date:   Tue, 1 Nov 2022 12:26:05 +0000
From:   Johnson Wang (王聖鑫) 
        <Johnson.Wang@...iatek.com>
To:     "sboyd@...nel.org" <sboyd@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Kuan-Hsin Lee (李冠新) 
        <Kuan-Hsin.Lee@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Yu-Chang Wang (王煜樟) 
        <Yu-Chang.Wang@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        Edward-JW Yang (楊哲維) 
        <Edward-JW.Yang@...iatek.com>
Subject: Re: [PATCH v4 2/4] dt-bindings: arm: mediatek: Add new bindings of
 MediaTek frequency hopping

On Fri, 2022-10-21 at 11:17 +0000, Johnson Wang (王聖鑫) wrote:
> On Mon, 2022-10-17 at 12:04 -0700, Stephen Boyd wrote:
> > Quoting Johnson Wang (王聖鑫) (2022-10-17 05:55:09)
> > > On Fri, 2022-10-14 at 13:42 -0700, Stephen Boyd wrote:
> > > > Quoting Johnson Wang (2022-10-13 04:23:34)
> > > > > +  - |
> > > > > +    #include <dt-bindings/clock/mt8186-clk.h>
> > > > > +    fhctl: fhctl@...0ce00 {
> > > > 
> > > > Is it a clock-controller? 'fhctl' isn't a generic node name.
> > > > 
> > > 
> > > This node is used for determining if PLLs adopt "hopping" method
> > > to
> > > adjust their frequency.
> > > It doesn't provide any clock but actually change the behavior of
> > > some
> > > PLLs with new .set_rate callback.
> > > Do you think this node acts like one kind of clock-controller?
> > 
> > Why can't we add the reg and properties to the node that implements
> > the
> > PLL?
> 
> Hi Stephen,
> 
> Now we use standard clocks property to get clock indices from
> apmixedsys node.
> 
> If we integrate the reg and properties into apmixedsys node, we have
> to
> figure out another way to get indices... (I think one node shouldn't
> take itself as input?)
> 
> There is an idea in my mind. Add these prperties into apmixedsys
> node.
> 
> 	mediatek,hopping-clocks = <CLK_APMIXED_MAINPLL>,
> 			          <CLK_APMIXED_MSDCPLL>;
> 	mediatek,ssc-percent = <2 3>;
> 
> 
> But I don't really know if this violates some rules.
> Could you please give us some suggestion?
> Thanks!
> 
> BRs,
> Johnson Wang

Hi Stephen,

A gentle ping for this.

Could you please give me some advices if you prefer intergrating these
into one node?

Thank you very much!


BRs,
Johnson Wang