linux-kernel - Re: [PATCH 2/5] ARM: dts: Device tree for AXM55xx.

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Date:	Tue, 15 Apr 2014 17:23:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Anders Berg <anders.berg@....com>
Cc:	linux-arm-kernel@...ts.infradead.org, olof@...om.net,
	mturquette@...aro.org, mark.rutland@....com, dbaryshkov@...il.com,
	linus.walleij@...aro.org, linux@....linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] ARM: dts: Device tree for AXM55xx.

On Tuesday 15 April 2014 17:20:47 Anders Berg wrote:
> > > +                   gpio0: gpio@...0092000 {
> > > +                           #gpio-cells = <2>;
> > > +                           compatible = "arm,pl061", "arm,primecell";
> > > +                           gpio-controller;
> > > +                           reg = <0x20 0x10092000 0x00 0x1000>;
> > > +                           interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>,
> > > +                                        <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
> > > +                           clocks = <&clk_per>;
> > > +                           clock-names = "apb_pclk";
> > > +                           status = "disabled";
> > 
> > The pl061 binding does not specify any clocks at all. Do we need to update
> > that?
> 
> Doesn't all AMBA devices need at least one apb_pclk since the bus driver does
> clk_get(...,"apb_pclk") before calling probe()?

Yes, I was mostly wondering whether we had a policy about whether this clock
should also be listed in the binding or not. My feeling is that it's better
to make that explicit.

	Arnd
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