pwm: core: Add details for ramp time and double pulse period

Add details in header file for PWM ramp time and double pulse
period. Also make the dummy function implementation as static
inline.

Change-Id: I8f28a52105b2cc902380c5577b44b88dca1e55e6
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: http://git-master/r/1461620
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Venkat Reddy Talla <vreddytalla@nvidia.com>
(cherry picked from commit 38c9304feaa316167c6bfb4f3d5f3f258cc34717)

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 381dd896741748d745bb05733e8a7da87d5c1517..901975fd120921b36dabf88e1d8d9c42a4803501 100644 (file)
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -196,6 +196,24 @@ static void of_pwmchip_remove(struct pwm_chip *chip)
                of_node_put(chip->dev->of_node);
 }
 
+static void init_pwm_of_config(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+       struct device_node *np = chip->dev->of_node;
+       u32 pval;
+       int ret;
+
+       if (!np)
+               return;
+
+       ret = of_property_read_u32(np, "pwm-ramp-time", &pval);
+       if (!ret)
+               pwm->ramp_time = pval;
+
+       ret = of_property_read_u32(np, "pwm-double-pulse-period", &pval);
+       if (!ret)
+               pwm->double_period = pval;
+}
+
 /**
  * pwm_set_chip_data() - set private chip data for a PWM
  * @pwm: PWM device
@@ -271,6 +289,8 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
                pwm->polarity = polarity;
                mutex_init(&pwm->lock);
 
+               init_pwm_of_config(chip, pwm);
+
                radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
        }
 

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index dee5337d88aeb1b3618344f6e64405a60410c746..e6d930f4336428ae64098a3c693bcb3fa4746c5c 100644 (file)
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -68,12 +68,13 @@ static inline void pwm_disable(struct pwm_device *pwm)
 {
 }
 
-int pwm_set_ramp_time(struct pwm_device *pwm, int ramp_time)
+static inline int pwm_set_ramp_time(struct pwm_device *pwm, int ramp_time)
 {
        return -EINVAL;
 }
 
-int pwm_set_double_pulse_period(struct pwm_device *pwm, int period)
+static inline int pwm_set_double_pulse_period(struct pwm_device *pwm,
+                                             int period)
 {
        return -EINVAL;
 }
@@ -112,6 +113,8 @@ enum {
  * @lock: used to serialize accesses to the PWM device where necessary
  * @period: period of the PWM signal (in nanoseconds)
  * @duty_cycle: duty cycle of the PWM signal (in nanoseconds)
+ * @double_period: Doble pulse period.
+ * @ramp_time: Ramp up/down time.
  * @polarity: polarity of the PWM signal
  */
 struct pwm_device {
@@ -186,6 +189,8 @@ static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm)
  * @capture: capture and report PWM signal
  * @enable: enable PWM output toggling
  * @disable: disable PWM output toggling
+ * @set_ramp_time: Set PWM ramp up/down time.
+ * @set_double_pulse_period: Set double pulse period time.
  * @dbg_show: optional routine to show contents in debugfs
  * @owner: helps prevent removal of modules exporting active PWMs
  */