Hi, Neil Armstrong <[email protected]> writes: > Add a function which sets the timer source from the clocks > binding on dm_timer_prepare call. > > In case the clocks property is not valid, it falls back to > the set_source() with 32_KHZ clock as default. > > Suggested-by: Tony Lindgren <[email protected]> > Signed-off-by: Neil Armstrong <[email protected]> > --- > arch/arm/plat-omap/dmtimer.c | 32 ++++++++++++++++++++++++++++++-- > 1 file changed, 30 insertions(+), 2 deletions(-) > > diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c > index 8ca94d3..5e8aece 100644 > --- a/arch/arm/plat-omap/dmtimer.c > +++ b/arch/arm/plat-omap/dmtimer.c > @@ -137,9 +137,33 @@ static int omap_dm_timer_reset(struct omap_dm_timer > *timer) > return 0; > } > > +static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer) > +{ > + int ret; > + struct clk *parent; > + > + if (unlikely(!timer)) > + return -EINVAL;
IMO, let this crash. If this happens we have bigger problems.
> + if (IS_ERR(timer->fclk))
> + return -EINVAL;
We bail out if we can't get fclk, this check is unnecessary.
> + parent = clk_get(&timer->pdev->dev, NULL);
why NULL ? You could use something more descriptive, but no strong
feelings.
> + if (IS_ERR(parent))
> + return -ENODEV;
> +
> + ret = clk_set_parent(timer->fclk, parent);
> + if (ret < 0)
> + pr_err("%s: failed to set parent\n", __func__);
> +
> + clk_put(parent);
> +
> + return ret;
> +}
> +
> static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
> {
> - int rc;
> + int rc, ret;
doesn't seem like you need this extra 'ret' variable. Just use 'rc'.
> @@ -166,7 +190,11 @@ static int omap_dm_timer_prepare(struct omap_dm_timer
> *timer)
> __omap_dm_timer_enable_posted(timer);
> omap_dm_timer_disable(timer);
>
> - return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
> + ret = omap_dm_timer_of_set_source(timer);
> + if (ret < 0 && ret == -ENODEV)
this < 0 check is pointless if you're going to check for equality to -ENODEV
> + return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
> +
> + return ret;
> }
>
> static inline u32 omap_dm_timer_reserved_systimer(int id)
> --
> 1.9.1
>
> --
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balbi
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