linux-kernel - Re: [PATCH v2 1/4] dt-bindings: clk: Add Baikal-T1 CCU PLLs binding

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Message-ID: <20200519123302.2lydamjy62ugkjb6@mobilestation>
Date:   Tue, 19 May 2020 15:33:02 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Rob Herring <robh@...nel.org>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Arnd Bergmann <arnd@...db.de>, <linux-mips@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] dt-bindings: clk: Add Baikal-T1 CCU PLLs binding

On Thu, May 14, 2020 at 02:13:18PM -0500, Rob Herring wrote:
> On Thu, May 07, 2020 at 01:22:57AM +0300, Serge Semin wrote:
> > Baikal-T1 Clocks Control Unit is responsible for transformation of a
> > signal coming from an external oscillator into clocks of various
> > frequencies to propagate them then to the corresponding clocks
> > consumers (either individual IP-blocks or clock domains). In order
> > to create a set of high-frequency clocks the external signal is
> > firstly handled by the embedded into CCU PLLs. So the corresponding
> > dts-node is just a normal clock-provider node with standard set of
> > properties. Note as being part of the Baikal-T1 System Controller its
> > DT node is supposed to be a child the system controller node.
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > Cc: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
> > Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> > Cc: Paul Burton <paulburton@...nel.org>
> > Cc: Ralf Baechle <ralf@...ux-mips.org>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: linux-mips@...r.kernel.org
> > 
> > ---
> > 

[nip]

> > +examples:
> > +  # Clock Control Unit PLL node:
> > +  - |
> > +    clock-controller-pll {
> > +      compatible = "baikal,bt1-ccu-pll";
> > +      #clock-cells = <1>;
> > +
> > +      clocks = <&clk25m>;
> > +      clock-names = "ref_clk";
> 
> If there's a register range within the system controller for the pll, 
> then add 'reg' even if Linux doesn't use it.

Rob, are you saying that the reg property should be mandatory or optional?
I've got a similar issue in several other patches you've already took a look.
In order to fix it there too could you please clarify this to me?

-Sergey