linux-kernel - RE: [PATCH v9 05/10] dt-bindings: clock: Add bindings for SP7021 clock driver

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Message-ID: <97cf98c598a04b77bb6de6e91fcdcc0b@cqplus1.com>
Date:   Mon, 28 Feb 2022 06:31:47 +0000
From:   qinjian[覃健] <qinjian@...lus1.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
CC:     "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "maz@...nel.org" <maz@...nel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "stefan.wahren@...e.com" <stefan.wahren@...e.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        Wells Lu 呂芳騰 <wells.lu@...plus.com>,
        Rob Herring <robh@...nel.org>
Subject: RE: [PATCH v9 05/10] dt-bindings: clock: Add bindings for SP7021
 clock driver

> > +examples:
> > +  - |
> > +    clkc: clock-controller@...00000 {
> > +      compatible = "sunplus,sp7021-clkc";
> > +      #clock-cells = <1>;
> > +      reg = <0x9c000000 0x280>;
> > +      clocks = <&extclk>, <&clkc PLL_SYS>;
> 
> Except the warning pointed out by Rob's bot, it looks like you feed this
> clock-controller with a clock from itself. Is there a point to express
> it in DTS at all?
 
Yes, pllsys is an internal clock, but it also as a parent clock for some other
clocks in this clock-controller.