From a74a198249c473fba092ee549068cea30d54f07e Mon Sep 17 00:00:00 2001 From: Ivaylo Dimitrov Date: Wed, 22 Jun 2016 22:22:18 +0300 Subject: [PATCH] pwm: omap-dmtimer: Allow for setting dmtimer clock source MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Acked-by: Rob Herring Acked-by: Thierry Reding Acked-by: Pali Rohár Signed-off-by: Tony Lindgren --- .../devicetree/bindings/pwm/pwm-omap-dmtimer.txt | 4 ++++ drivers/pwm/pwm-omap-dmtimer.c | 12 +++++++----- 2 files changed, 11 insertions(+), 5 deletions(-) diff --git a/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt b/Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt index 5befb538db95..2e53324fb720 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 3e95090cd7cf..5ad42f33e70c 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; -- 2.20.1