linux-kernel - Re: [PATCH v4 12/12] MIPS: Add basic support for the TL-WR1043ND version 1

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Message-Id: <20150622180123.f171a1985eb3c984465144f8@gmail.com>
Date:	Mon, 22 Jun 2015 18:01:23 +0300
From:	Antony Pavlov <antonynpavlov@...il.com>
To:	Alban <albeu@...e.fr>
Cc:	linux-mips@...ux-mips.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Qais Yousef <qais.yousef@...tec.com>,
	Gabor Juhos <juhosg@...nwrt.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 12/12] MIPS: Add basic support for the TL-WR1043ND
 version 1

On Sat, 20 Jun 2015 12:51:37 +0200
Alban <albeu@...e.fr> wrote:

> On Mon, 15 Jun 2015 10:42:13 +0300
> Antony Pavlov <antonynpavlov@...il.com> wrote:
> 
> > On Wed, 10 Jun 2015 23:58:11 +0200
> > Alban <albeu@...e.fr> wrote:
> > 
> > > On Mon, 8 Jun 2015 13:17:58 +0300
> > > Antony Pavlov <antonynpavlov@...il.com> wrote:
> > > 
> > > > IMHO AR9132 SoC can't work without external oscilator.
> > > > 
> > > > Can we just move basic extosc declaration to SoC dt file
> > > > (ar9132.dtsi)? So board dt file ar9132_tl_wr1043nd_v1.dts will
> > > > contain only oscilator clock frequency value.
> > > 
> > > I would prefer to keep the split between the files in sync with the
> > > hardware. I understand that most simple board designs use a fixed
> > > oscillator, but that might not always be the case.
> > > 
> > 
> > The AR9132 SoC __always__ use one external oscilator.
> 
> Yes, but what I don't like is to impose the clock source being a
> fixed-oscillator. What if the board use a clock from another
> component that need to be represented in the DT as something else
> than a fixed-oscillator?

The absolute majority of the ar9132-based boards has fixed-oscillator
(Actually I suppose all of them has fixed oscillator).

If some board has different clock source then we can completely alter
extosc node in the board dts file. (But I have some doubts in existence
of such board.)

-- 
Best regards,
  Antony Pavlov
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