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

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Date:	Mon, 22 Sep 2014 20:56:47 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
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 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.

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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