lp8727_charger: Add configurable debouce timer

Debounce time is configurable in the platform side. If it is not defined,
the default value is 270ms.

Platform data is msec unit, and this time is converted to jiffies
internally. The workqueue uses this jiffies time in the interrupt
handling. So debounce_jiffies is added in the private data.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/lp8727_charger.c

@@ -17,7 +17,7 @@
 #include <linux/power_supply.h>
 #include <linux/platform_data/lp8727.h>
 
-#define DEBOUNCE_MSEC	270
+#define DEFAULT_DEBOUNCE_MSEC	270
 
 /* Registers */
 #define CTRL1		0x1
@@ -90,6 +90,7 @@ struct lp8727_chg {
 	struct lp8727_psy *psy;
 	struct lp8727_chg_param *chg_parm;
 	enum lp8727_dev_id devid;
+	unsigned long debounce_jiffies;
 };
 
 static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
@@ -236,15 +237,18 @@ static void lp8727_delayed_func(struct work_struct *_work)
 static irqreturn_t lp8727_isr_func(int irq, void *ptr)
 {
 	struct lp8727_chg *pchg = ptr;
-	unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
 
-	queue_delayed_work(pchg->irqthread, &pchg->work, delay);
+	queue_delayed_work(pchg->irqthread, &pchg->work,
+					pchg->debounce_jiffies);
 
 	return IRQ_HANDLED;
 }
 
 static int lp8727_intr_config(struct lp8727_chg *pchg)
 {
+	unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
+						DEFAULT_DEBOUNCE_MSEC;
+
 	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
 
 	pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
@@ -253,6 +257,8 @@ static int lp8727_intr_config(struct lp8727_chg *pchg)
 		return -ENOMEM;
 	}
 
+	pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
+
 	return request_threaded_irq(pchg->client->irq,
 				NULL,
 				lp8727_isr_func,

include/linux/platform_data/lp8727.h

@@ -53,6 +53,7 @@ struct lp8727_chg_param {
  * @get_batt_temp : get battery temperature
  * @ac                : charging parameters for AC type charger
  * @usb               : charging parameters for USB type charger
+ * @debounce_msec     : interrupt debounce time
  */
 struct lp8727_platform_data {
 	u8 (*get_batt_present)(void);
@@ -61,6 +62,7 @@ struct lp8727_platform_data {
 	u8 (*get_batt_temp)(void);
 	struct lp8727_chg_param *ac;
 	struct lp8727_chg_param *usb;
+	unsigned int debounce_msec;
 };
 
 #endif