[tip: timers/core] clocksource/drivers/timer-ti-dm: Add support to get pwm current status

[tip-bot2 for Lokesh Vutla]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     92fd86864ec4ac089de47f0f1f4c47418b343448
Gitweb:        https://git.kernel.org/tip/92fd86864ec4ac089de47f0f1f4c47418b343448
Author:        Lokesh Vutla <lokeshvutla@xxxxxx>
AuthorDate:    Thu, 05 Mar 2020 13:57:14 +05:30
Committer:     Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitterDate: Mon, 16 Mar 2020 12:40:42 +01:00

clocksource/drivers/timer-ti-dm: Add support to get pwm current status

omap_dm_timer_ops provide support to configure the pwm but there is no
support to get the current status. For configuring pwm it is advised to
check the current hw status instead of relying on pwm framework. So
implement a new timer ops to get the current status of pwm.

Signed-off-by: Lokesh Vutla <lokeshvutla@xxxxxx>
Acked-by: Tony Lindgen <tony@xxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200305082715.15861-6-lokeshvutla@xxxxxx
---
 drivers/clocksource/timer-ti-dm.c          | 15 +++++++++++++++
 include/linux/platform_data/dmtimer-omap.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/drivers/clocksource/timer-ti-dm.c b/drivers/clocksource/timer-ti-dm.c
index b565b84..73ac73e 100644
--- a/drivers/clocksource/timer-ti-dm.c
+++ b/drivers/clocksource/timer-ti-dm.c
@@ -627,6 +627,20 @@ static int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
 	return 0;
 }
 
+static int omap_dm_timer_get_pwm_status(struct omap_dm_timer *timer)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	omap_dm_timer_disable(timer);
+
+	return l;
+}
+
 static int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer,
 					int prescaler)
 {
@@ -927,6 +941,7 @@ static const struct omap_dm_timer_ops dmtimer_ops = {
 	.set_load = omap_dm_timer_set_load,
 	.set_match = omap_dm_timer_set_match,
 	.set_pwm = omap_dm_timer_set_pwm,
+	.get_pwm_status = omap_dm_timer_get_pwm_status,
 	.set_prescaler = omap_dm_timer_set_prescaler,
 	.read_counter = omap_dm_timer_read_counter,
 	.write_counter = omap_dm_timer_write_counter,
diff --git a/include/linux/platform_data/dmtimer-omap.h b/include/linux/platform_data/dmtimer-omap.h
index bdaaf53..3173b7b 100644
--- a/include/linux/platform_data/dmtimer-omap.h
+++ b/include/linux/platform_data/dmtimer-omap.h
@@ -36,6 +36,7 @@ struct omap_dm_timer_ops {
 			     unsigned int match);
 	int	(*set_pwm)(struct omap_dm_timer *timer, int def_on,
 			   int toggle, int trigger);
+	int	(*get_pwm_status)(struct omap_dm_timer *timer);
 	int	(*set_prescaler)(struct omap_dm_timer *timer, int prescaler);
 
 	unsigned int (*read_counter)(struct omap_dm_timer *timer);