On 22 September 2014 11:46, Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> ---
> 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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