linux-kernel - [PATCH v3 2/2] media: atmel: atmel-sama5d2-isc: fixed checkpatch warnings

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Date:   Thu, 6 Jun 2019 07:43:47 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <hverkuil@...all.nl>, <linux-media@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <Eugen.Hristev@...rochip.com>
Subject: [PATCH v3 2/2] media: atmel: atmel-sama5d2-isc: fixed checkpatch
 warnings

From: Eugen Hristev <eugen.hristev@...rochip.com>

Checkpatch complaining that locks do not have comments,
unaligned code and macro reuse of same argument in to_isc_clk.
Fixed them by renaming, realigning and adding struct comments

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
Changes in v3:
- new patch, addresses the checkpatch issues that Hans asked to fix

 drivers/media/platform/atmel/atmel-isc.h         | 51 +++++++++++++++++++++---
 drivers/media/platform/atmel/atmel-sama5d2-isc.c |  4 +-
 2 files changed, 48 insertions(+), 7 deletions(-)

diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
index 0bd5dff..6ff9fa8 100644
--- a/drivers/media/platform/atmel/atmel-isc.h
+++ b/drivers/media/platform/atmel/atmel-isc.h
@@ -24,14 +24,14 @@ struct isc_clk {
 	struct clk_hw   hw;
 	struct clk      *clk;
 	struct regmap   *regmap;
-	spinlock_t	lock;
+	spinlock_t	lock;	/* synchronize 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 synchronize 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 synchronizing userspace file operations
+ *			with ISC operations
+ * @awb_lock:		lock for synchronizing 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; /* sync 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; /* sync access to file operations */
+	spinlock_t		awb_lock; /* sync access to DMA buffers from awb work queue */
 
 	struct regmap_field	*pipeline[ISC_PIPE_LINE_NODE_NUM];
 
diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
index 69faaaf..299243f 100644
--- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
+++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
@@ -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;
-- 
2.7.4