linux-kernel - Re: [PATCH v4 7/7] arm64: dts: mt8173: Add subsystem clock controller device nodes

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Date:	Tue, 28 Jul 2015 13:29:58 +0800
From:	James Liao <jamesjj.liao@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	Daniel Kurtz <djkurtz@...omium.org>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"Heiko Stubner" <heiko@...ech.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Ricky Liang <jcliang@...omium.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v4 7/7] arm64: dts: mt8173: Add subsystem clock
 controller device nodes

On Mon, 2015-07-27 at 03:21 -0700, Matthias Brugger wrote:
> On Monday, July 27, 2015 10:56:22 AM James Liao wrote:
> > Hi Daniel,
> > 
> > On Fri, 2015-07-24 at 19:32 +0800, Daniel Kurtz wrote:
> > > > @@ -88,6 +88,13 @@
> > > > 
> > > >                 #clock-cells = <0>;
> > > >         
> > > >         };
> > > > 
> > > > +       cpum_ck: dummy_clk {
> > > 
> > > I'm not a big fan of this "dummy_clk".
> > > The 'name' part of the devicetree node is supposed to be generic.
> > > So, perhaps just oscillator@2, and move it down below clk32k:
> > > oscillator@1.
> > 
> > > Otherwise:
> > cpum_ck is a test clock which only available in IC test. It's empty on
> > MT8173 evaluation or production boards. Should we name this kind of
> > empty clock as an oscillator? Or is there a better name for it?
> > 
> 
> So if it will never be part of any available boards, why do you want to add 
> it?

infra_cpum is a clock gate, and its clock comes from an external clock.
In previous versions we named the external clock as "clk_null", but it's
not accepted. A specified name is preferred even it's not available on
some boards. So I named it as cpum_ck in this patch.


Best regards,

James

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