linux-kernel - Re: [PATCH v6 2/4] amba: Add helper macros for (un)preparing AMBA clock

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Date:	Tue, 23 Sep 2014 09:30:36 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Russell King <linux@....linux.org.uk>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dmaengine@...r.kernel.org, Grant Likely <grant.likely@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v6 2/4] amba: Add helper macros for (un)preparing AMBA clock

On pon, 2014-09-22 at 20:56 +0200, Ulf Hansson wrote:
> On 22 September 2014 11:46, Krzysztof Kozlowski <k.kozlowski@...sung.com> wrote:
> > Add amba_pclk_prepare() and amba_pclk_unprepare() macros for handling
> > the AMBA bus clock by device drivers.
> >
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > ---
> >  include/linux/amba/bus.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h
> > index fdd7e1b61f60..ad52027a9cbf 100644
> > --- a/include/linux/amba/bus.h
> > +++ b/include/linux/amba/bus.h
> > @@ -92,6 +92,12 @@ void amba_release_regions(struct amba_device *);
> >  #define amba_pclk_disable(d)   \
> >         do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
> >
> > +#define amba_pclk_prepare(d)   \
> > +       (IS_ERR((d)->pclk) ? 0 : clk_prepare((d)->pclk))
> 
> You don't need the IS_ERR, because amba_probe will fail if it won't be
> able to fetch the clock.
> 
> Same comment below.

Right, I followed the convention for amba_pclk_enable but this is not
needed. I'll change it and send new version.

Best regards,
Krzysztof

> 
> Kind regards
> Uffe
> 
> > +
> > +#define amba_pclk_unprepare(d) \
> > +       do { if (!IS_ERR((d)->pclk)) clk_unprepare((d)->pclk); } while (0)
> > +
> >  /* Some drivers don't use the struct amba_device */
> >  #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
> >  #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
> > --
> > 1.9.1
> >

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