[LINUX PATCH v2 1/3] clocksource: timer-cadence-ttc: Do not probe TTC device configured as PWM

[Mubin Sayyed <mubin.sayyed@amd.com>]

TTC device can act either as clocksource/clockevent or
PWM generator, it would be decided by pwm-cells property.
TTC PWM feature would be supported through separate driver
based on PWM framework.

If pwm-cells property is present in TTC node, it would be
treated as PWM device, and clocksource driver should just
skip it.

Signed-off-by: Mubin Sayyed <mubin.sayyed@amd.com>
---
Changes for v2:
    - Added comment regarding pwm-cells property
---
 drivers/clocksource/timer-cadence-ttc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/clocksource/timer-cadence-ttc.c b/drivers/clocksource/timer-cadence-ttc.c
index 32daaac9b132..f8fcb1a4bdd0 100644
--- a/drivers/clocksource/timer-cadence-ttc.c
+++ b/drivers/clocksource/timer-cadence-ttc.c
@@ -477,6 +477,13 @@ static int __init ttc_timer_probe(struct platform_device *pdev)
 	u32 timer_width = 16;
 	struct device_node *timer = pdev->dev.of_node;
 
+	/*
+	 * If pwm-cells property is present in TTC node,
+	 * it would be treated as PWM device.
+	 */
+	if (of_property_read_bool(timer, "#pwm-cells"))
+		return -ENODEV;
+
 	if (initialized)
 		return 0;
 
-- 
2.25.1