On Thu, Oct 23, 2014 at 05:22:58PM +0300, Grygorii Strashko wrote:
> From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
>
> The existing pm_clk_add() allows to pass a clock by con_id. However,
> when referring to a specific clock from DT, no con_id is available.
>
> Add pm_clk_add_clk(), which allows to specify the struct clk * directly.
>
> CC: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
> CC: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
> Reviewed-by: Kevin Hilman <khilman@xxxxxxxxxx>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
> ---
> drivers/base/power/clock_ops.c | 41 +++++++++++++++++++++++++++++++----------
> include/linux/pm_clock.h | 8 ++++++++
> 2 files changed, 39 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> index 7836930..f14b767 100644
> --- a/drivers/base/power/clock_ops.c
> +++ b/drivers/base/power/clock_ops.c
> @@ -53,7 +53,8 @@ static inline int __pm_clk_enable(struct device *dev, struct clk *clk)
> */
> static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
> {
> - ce->clk = clk_get(dev, ce->con_id);
> + if (!ce->clk)
> + ce->clk = clk_get(dev, ce->con_id);
> if (IS_ERR(ce->clk)) {
> ce->status = PCE_STATUS_ERROR;
> } else {
> @@ -63,15 +64,8 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce)
> }
> }
>
> -/**
> - * pm_clk_add - Start using a device clock for power management.
> - * @dev: Device whose clock is going to be used for power management.
> - * @con_id: Connection ID of the clock.
> - *
> - * Add the clock represented by @con_id to the list of clocks used for
> - * the power management of @dev.
> - */
> -int pm_clk_add(struct device *dev, const char *con_id)
> +static int __pm_clk_add(struct device *dev, const char *con_id,
> + struct clk *clk)
> {
> struct pm_subsys_data *psd = dev_to_psd(dev);
> struct pm_clock_entry *ce;
> @@ -93,6 +87,8 @@ int pm_clk_add(struct device *dev, const char *con_id)
> kfree(ce);
> return -ENOMEM;
> }
> + } else {
You need __clk_get(clk) here, otherwise when you will be removing clocks
you'll be dropping a reference that does not belong to you (as yiou have
not taken it).
> + ce->clk = clk;
> }
>
Thanks.
--
Dmitry
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