On Fri, Oct 04, 2013 at 12:08:30PM +0200, Sebastian Hesselbarth wrote:
> To determine if a clk has been previously enabled, provide a public
> clk_is_enabled function. This is especially helpful to check the state
> of clk-gate without actually changing the state of the gate.
>
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselba...@gmail.com>
Tested-by: Andrew Lunn <and...@lunn.ch>
Andrew
> ---
> Cc: Mike Turquette <mturque...@linaro.org>
> Cc: Russell King <li...@arm.linux.org.uk>
> Cc: Jason Cooper <ja...@lakedaemon.net>
> Cc: Andrew Lunn <and...@lunn.ch>
> Cc: Grant Likely <grant.lik...@linaro.org>
> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> Cc: Jason Gunthorpe <jguntho...@obsidianresearch.com>
> Cc: Ezequiel Garcia <ezequiel.gar...@free-electrons.com>
> Cc: linux-arm-ker...@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> ---
> drivers/clk/clk.c | 18 ++++++++++++++++++
> include/linux/clk.h | 13 +++++++++++++
> 2 files changed, 31 insertions(+)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index a004769..26698d3 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -929,6 +929,24 @@ int clk_enable(struct clk *clk)
> EXPORT_SYMBOL_GPL(clk_enable);
>
> /**
> + * clk_is_enabled - return the enabled state of a clk
> + * @clk: the clk whose enabled state gets returned
> + *
> + * Returns true if the clock is enabled, false otherwise.
> + */
> +bool clk_is_enabled(struct clk *clk)
> +{
> + bool is_en;
> +
> + clk_prepare_lock();
> + is_en = __clk_is_enabled(clk);
> + clk_prepare_unlock();
> +
> + return is_en;
> +}
> +EXPORT_SYMBOL_GPL(clk_is_enabled);
> +
> +/**
> * __clk_round_rate - round the given rate for a clk
> * @clk: round the rate of this clock
> * @rate: the rate which is to be rounded
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index 9a6d045..8cbf2f7 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -187,6 +187,14 @@ int clk_enable(struct clk *clk);
> void clk_disable(struct clk *clk);
>
> /**
> + * clk_is_enabled - return the enabled state of a clk
> + * @clk: the clk whose enabled state gets returned
> + *
> + * Returns true if the clock is enabled, false otherwise.
> + */
> +bool clk_is_enabled(struct clk *clk);
> +
> +/**
> * clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
> * This is only valid once the clock source has been enabled.
> * @clk: clock source
> @@ -299,6 +307,11 @@ static inline int clk_enable(struct clk *clk)
>
> static inline void clk_disable(struct clk *clk) {}
>
> +static inline bool clk_is_enabled(struct clk *clk)
> +{
> + return false;
> +}
> +
> static inline unsigned long clk_get_rate(struct clk *clk)
> {
> return 0;
> --
> 1.7.10.4
>
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