@@ -24,14 +24,14 @@ struct isc_clk {
 	struct clk_hw   hw;
 	struct clk      *clk;
 	struct regmap   *regmap;
-	spinlock_t	lock;
+	spinlock_t	lock;	/* serialize access to clock registers */
 	u8		id;
 	u8		parent_id;
 	u32		div;
 	struct device	*dev;
 };
 
-#define to_isc_clk(hw) container_of(hw, struct isc_clk, hw)
+#define to_isc_clk(v) container_of(v, struct isc_clk, hw)
 
 struct isc_buffer {
 	struct vb2_v4l2_buffer  vb;

@@ -146,6 +146,47 @@ struct isc_ctrls {
 
 #define ISC_PIPE_LINE_NODE_NUM	11
 
+/*
+ * struct isc_device - ISC device driver data/config struct
+ * @regmap:		Register map
+ * @hclock:		Hclock clock input (refer datasheet)
+ * @ispck:		iscpck clock (refer datasheet)
+ * @isc_clks:		ISC clocks
+ *
+ * @dev:		Registered device driver
+ * @v4l2_dev:		v4l2 registered device
+ * @video_dev:		registered video device
+ *
+ * @vb2_vidq:		video buffer 2 video queue
+ * @dma_queue_lock:	lock to serialize the dma buffer queue
+ * @dma_queue:		the queue for dma buffers
+ * @cur_frm:		current isc frame/buffer
+ * @sequence:		current frame number
+ * @stop:		true if isc is not streaming, false if streaming
+ * @comp:		completion reference that signals frame completion
+ *
+ * @fmt:		current v42l format
+ * @user_formats:	list of formats that are supported and agreed with sd
+ * @num_user_formats:	how many formats are in user_formats
+ *
+ * @config:		current ISC format configuration
+ * @try_config:		the current ISC try format , not yet activated
+ *
+ * @ctrls:		holds information about ISC controls
+ * @do_wb_ctrl:		control regarding the DO_WHITE_BALANCE button
+ * @awb_work:		workqueue reference for autowhitebalance histogram
+ *			analysis
+ *
+ * @lock:		lock for serializing userspace file operations
+ *			with ISC operations
+ * @awb_lock:		lock for serializing awb work queue operations
+ *			with DMA/buffer operations
+ *
+ * @pipeline:		configuration of the ISC pipeline
+ *
+ * @current_subdev:	current subdevice: the sensor
+ * @subdev_entities:	list of subdevice entitites
+ */
 struct isc_device {
 	struct regmap		*regmap;
 	struct clk		*hclock;

@@ -157,7 +198,7 @@ struct isc_device {
 	struct video_device	video_dev;
 
 	struct vb2_queue	vb2_vidq;
-	spinlock_t		dma_queue_lock;
+	spinlock_t		dma_queue_lock; /* serialize access to dma queue */
 	struct list_head	dma_queue;
 	struct isc_buffer	*cur_frm;
 	unsigned int		sequence;

@@ -175,8 +216,8 @@ struct isc_device {
 	struct v4l2_ctrl	*do_wb_ctrl;
 	struct work_struct	awb_work;
 
-	struct mutex		lock;
-	spinlock_t		awb_lock;
+	struct mutex		lock; /* serialize access to file operations */
+	spinlock_t		awb_lock; /* serialize access to DMA buffers from awb work queue */
 
 	struct regmap_field	*pipeline[ISC_PIPE_LINE_NODE_NUM];
 

@@ -87,8 +87,8 @@ static int isc_parse_dt(struct device *dev, struct isc_device *isc)
 			break;
 		}
 
-		subdev_entity = devm_kzalloc(dev,
-					  sizeof(*subdev_entity), GFP_KERNEL);
+		subdev_entity = devm_kzalloc(dev, sizeof(*subdev_entity),
+					     GFP_KERNEL);
 		if (!subdev_entity) {
 			of_node_put(rem);
 			ret = -ENOMEM;