diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
index 38fd2f04c07eed8df424dd7ef6f04ba25d7f4054..6884dd1c997bfadc7841d8260b9df62b0d9d2c0d 100644
--- a/drivers/misc/ti-st/st_kim.c
+++ b/drivers/misc/ti-st/st_kim.c
@@ -434,11 +434,17 @@ long st_kim_start(void *kim_data)
 {
 	long err = 0;
 	long retry = POR_RETRY_COUNT;
+	struct ti_st_plat_data	*pdata;
 	struct kim_data_s	*kim_gdata = (struct kim_data_s *)kim_data;
 
 	pr_info(" %s", __func__);
+	pdata = kim_gdata->kim_pdev->dev.platform_data;
 
 	do {
+		/* platform specific enabling code here */
+		if (pdata->chip_enable)
+			pdata->chip_enable(kim_gdata);
+
 		/* Configure BT nShutdown to HIGH state */
 		gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
 		mdelay(5);	/* FIXME: a proper toggle */
@@ -489,6 +495,8 @@ long st_kim_stop(void *kim_data)
 {
 	long err = 0;
 	struct kim_data_s	*kim_gdata = (struct kim_data_s *)kim_data;
+	struct ti_st_plat_data	*pdata =
+		kim_gdata->kim_pdev->dev.platform_data;
 
 	INIT_COMPLETION(kim_gdata->ldisc_installed);
 
@@ -515,6 +523,10 @@ long st_kim_stop(void *kim_data)
 	gpio_set_value(kim_gdata->nshutdown, GPIO_HIGH);
 	mdelay(1);
 	gpio_set_value(kim_gdata->nshutdown, GPIO_LOW);
+
+	/* platform specific disable */
+	if (pdata->chip_disable)
+		pdata->chip_disable(kim_gdata);
 	return err;
 }
 
diff --git a/drivers/misc/ti-st/st_ll.c b/drivers/misc/ti-st/st_ll.c
index 3f2495138855457ac6dfc6cfa5de554ed47ee071..1ff460a8e9c74f67e584d634016fa25332fd351c 100644
--- a/drivers/misc/ti-st/st_ll.c
+++ b/drivers/misc/ti-st/st_ll.c
@@ -22,6 +22,7 @@
 #define pr_fmt(fmt) "(stll) :" fmt
 #include <linux/skbuff.h>
 #include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/ti_wilink_st.h>
 
 /**********************************************************************/
@@ -37,6 +38,9 @@ static void send_ll_cmd(struct st_data_s *st_data,
 
 static void ll_device_want_to_sleep(struct st_data_s *st_data)
 {
+	struct kim_data_s	*kim_data;
+	struct ti_st_plat_data	*pdata;
+
 	pr_debug("%s", __func__);
 	/* sanity check */
 	if (st_data->ll_state != ST_LL_AWAKE)
@@ -46,10 +50,19 @@ static void ll_device_want_to_sleep(struct st_data_s *st_data)
 	send_ll_cmd(st_data, LL_SLEEP_ACK);
 	/* update state */
 	st_data->ll_state = ST_LL_ASLEEP;
+
+	/* communicate to platform about chip asleep */
+	kim_data = st_data->kim_data;
+	pdata = kim_data->kim_pdev->dev.platform_data;
+	if (pdata->chip_asleep)
+		pdata->chip_asleep(NULL);
 }
 
 static void ll_device_want_to_wakeup(struct st_data_s *st_data)
 {
+	struct kim_data_s	*kim_data;
+	struct ti_st_plat_data	*pdata;
+
 	/* diff actions in diff states */
 	switch (st_data->ll_state) {
 	case ST_LL_ASLEEP:
@@ -70,6 +83,12 @@ static void ll_device_want_to_wakeup(struct st_data_s *st_data)
 	}
 	/* update state */
 	st_data->ll_state = ST_LL_AWAKE;
+
+	/* communicate to platform about chip wakeup */
+	kim_data = st_data->kim_data;
+	pdata = kim_data->kim_pdev->dev.platform_data;
+	if (pdata->chip_asleep)
+		pdata->chip_awake(NULL);
 }
 
 /**********************************************************************/
diff --git a/include/linux/ti_wilink_st.h b/include/linux/ti_wilink_st.h
index b004e557caa9c064c15b41b26bf773677f529913..2ef4385da6bf7a70ed60a8a01b7fdb54201c1840 100644
--- a/include/linux/ti_wilink_st.h
+++ b/include/linux/ti_wilink_st.h
@@ -410,7 +410,28 @@ struct gps_event_hdr {
 	u16 plen;
 } __attribute__ ((packed));
 
-/* platform data */
+/**
+ * struct ti_st_plat_data - platform data shared between ST driver and
+ *	platform specific board file which adds the ST device.
+ * @nshutdown_gpio: Host's GPIO line to which chip's BT_EN is connected.
+ * @dev_name: The UART/TTY name to which chip is interfaced. (eg: /dev/ttyS1)
+ * @flow_cntrl: Should always be 1, since UART's CTS/RTS is used for PM
+ *	purposes.
+ * @baud_rate: The baud rate supported by the Host UART controller, this will
+ *	be shared across with the chip via a HCI VS command from User-Space Init
+ *	Mgr application.
+ * @suspend:
+ * @resume: legacy PM routines hooked to platform specific board file, so as
+ *	to take chip-host interface specific action.
+ * @chip_enable:
+ * @chip_disable: Platform/Interface specific mux mode setting, GPIO
+ *	configuring, Host side PM disabling etc.. can be done here.
+ * @chip_asleep:
+ * @chip_awake: Chip specific deep sleep states is communicated to Host
+ *	specific board-xx.c to take actions such as cut UART clocks when chip
+ *	asleep or run host faster when chip awake etc..
+ *
+ */
 struct ti_st_plat_data {
 	long nshutdown_gpio;
 	unsigned char dev_name[UART_DEV_NAME_LEN]; /* uart name */
@@ -418,6 +439,10 @@ struct ti_st_plat_data {
 	unsigned long baud_rate;
 	int (*suspend)(struct platform_device *, pm_message_t);
 	int (*resume)(struct platform_device *);
+	int (*chip_enable) (struct kim_data_s *);
+	int (*chip_disable) (struct kim_data_s *);
+	int (*chip_asleep) (struct kim_data_s *);
+	int (*chip_awake) (struct kim_data_s *);
 };
 
 #endif /* TI_WILINK_ST_H */