pwm: add period and polarity to struct pwm_lookup

Add period and polarity members to struct pwm_lookup so that platforms
using the lookup table can be treated the same way as those using the
device tree.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index a804713..4b66bf0 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -661,10 +661,16 @@
 		}
 	}
 
+	mutex_unlock(&pwm_lookup_lock);
+
 	if (chip)
 		pwm = pwm_request_from_chip(chip, index, con_id ?: dev_id);
+	if (IS_ERR(pwm))
+		return pwm;
 
-	mutex_unlock(&pwm_lookup_lock);
+	pwm_set_period(pwm, p->period);
+	pwm_set_polarity(pwm, p->polarity);
+
 
 	return pwm;
 }