| Message ID | 1466623341-30130-3-git-send-email-ivo.g.dimitrov.75@gmail.com |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Wed, Jun 22, 2016 at 10:22:18PM +0300, Ivaylo Dimitrov wrote: > OMAP GP timers can have different input clocks that allow different PWM > frequencies. However, there is no other way of setting the clock source but > through clocks or clock-names properties of the timer itself. This limits > PWM functionality to only the frequencies allowed by the particular clock > source. Allowing setting the clock source by PWM rather than by timer > allows different PWMs to have different ranges by not hard-wiring the clock > source to the timer. > > Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> > Acked-by: Rob Herring <robh@kernel.org> > --- > Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt | 4 ++++ > drivers/pwm/pwm-omap-dmtimer.c | 12 +++++++----- > 2 files changed, 11 insertions(+), 5 deletions(-) Acked-by: Thierry Reding <treding@nvidia.com>
diff --git a/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt b/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt index 5befb53..2e53324 100644 --- a/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt +++ b/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt @@ -9,6 +9,10 @@ Required properties: Optional properties: - ti,prescaler: Should be a value between 0 and 7, see the timers datasheet +- ti,clock-source: Set dmtimer parent clock, values between 0 and 2: + - 0x00 - high-frequency system clock (timer_sys_ck) + - 0x01 - 32-kHz always-on clock (timer_32k_ck) + - 0x02 - external clock (timer_ext_ck, OMAP2 only) Example: pwm9: dmtimer-pwm@9 { diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index 3e95090..5ad42f3 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -245,7 +245,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) struct pwm_omap_dmtimer_chip *omap; struct pwm_omap_dmtimer_pdata *pdata; pwm_omap_dmtimer *dm_timer; - u32 prescaler; + u32 v; int status; pdata = dev_get_platdata(&pdev->dev); @@ -306,10 +306,12 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) if (pm_runtime_active(&omap->dm_timer_pdev->dev)) omap->pdata->stop(omap->dm_timer); - /* setup dmtimer prescaler */ - if (!of_property_read_u32(pdev->dev.of_node, "ti,prescaler", - &prescaler)) - omap->pdata->set_prescaler(omap->dm_timer, prescaler); + if (!of_property_read_u32(pdev->dev.of_node, "ti,prescaler", &v)) + omap->pdata->set_prescaler(omap->dm_timer, v); + + /* setup dmtimer clock source */ + if (!of_property_read_u32(pdev->dev.of_node, "ti,clock-source", &v)) + omap->pdata->set_source(omap->dm_timer, v); omap->chip.dev = &pdev->dev; omap->chip.ops = &pwm_omap_dmtimer_ops;