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

[Ulf Hansson]

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
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/