coresight: etb10: Clean up device specific data

Track the coresight device instead of the real device.
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/coresight/coresight-etb10.c

@@ -66,7 +66,6 @@
 /**
  * struct etb_drvdata - specifics associated to an ETB component
  * @base:	memory mapped base address for this component.
- * @dev:	the device entity associated to this component.
  * @atclk:	optional clock for the core parts of the ETB.
  * @csdev:	component vitals needed by the framework.
  * @miscdev:	specifics to handle "/dev/xyz.etb" entry.
@@ -81,7 +80,6 @@
  */
 struct etb_drvdata {
 	void __iomem		*base;
-	struct device		*dev;
 	struct clk		*atclk;
 	struct coresight_device	*csdev;
 	struct miscdevice	miscdev;
@@ -227,7 +225,6 @@ static int etb_enable_perf(struct coresight_device *csdev, void *data)
 static int etb_enable(struct coresight_device *csdev, u32 mode, void *data)
 {
 	int ret;
-	struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 
 	switch (mode) {
 	case CS_MODE_SYSFS:
@@ -244,13 +241,14 @@ static int etb_enable(struct coresight_device *csdev, u32 mode, void *data)
 	if (ret)
 		return ret;
 
-	dev_dbg(drvdata->dev, "ETB enabled\n");
+	dev_dbg(&csdev->dev, "ETB enabled\n");
 	return 0;
 }
 
 static void __etb_disable_hw(struct etb_drvdata *drvdata)
 {
 	u32 ffcr;
+	struct device *dev = &drvdata->csdev->dev;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -263,7 +261,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	writel_relaxed(ffcr, drvdata->base + ETB_FFCR);
 
 	if (coresight_timeout(drvdata->base, ETB_FFCR, ETB_FFCR_BIT, 0)) {
-		dev_err(drvdata->dev,
+		dev_err(dev,
 		"timeout while waiting for completion of Manual Flush\n");
 	}
 
@@ -271,7 +269,7 @@ static void __etb_disable_hw(struct etb_drvdata *drvdata)
 	writel_relaxed(0x0, drvdata->base + ETB_CTL_REG);
 
 	if (coresight_timeout(drvdata->base, ETB_FFSR, ETB_FFSR_BIT, 1)) {
-		dev_err(drvdata->dev,
+		dev_err(dev,
 			"timeout while waiting for Formatter to Stop\n");
 	}
 
@@ -286,6 +284,7 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
 	u32 read_data, depth;
 	u32 read_ptr, write_ptr;
 	u32 frame_off, frame_endoff;
+	struct device *dev = &drvdata->csdev->dev;
 
 	CS_UNLOCK(drvdata->base);
 
@@ -295,10 +294,10 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
 	frame_off = write_ptr % ETB_FRAME_SIZE_WORDS;
 	frame_endoff = ETB_FRAME_SIZE_WORDS - frame_off;
 	if (frame_off) {
-		dev_err(drvdata->dev,
+		dev_err(dev,
 			"write_ptr: %lu not aligned to formatter frame size\n",
 			(unsigned long)write_ptr);
-		dev_err(drvdata->dev, "frameoff: %lu, frame_endoff: %lu\n",
+		dev_err(dev, "frameoff: %lu, frame_endoff: %lu\n",
 			(unsigned long)frame_off, (unsigned long)frame_endoff);
 		write_ptr += frame_endoff;
 	}
@@ -365,7 +364,7 @@ static int etb_disable(struct coresight_device *csdev)
 	drvdata->mode = CS_MODE_DISABLED;
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "ETB disabled\n");
+	dev_dbg(&csdev->dev, "ETB disabled\n");
 	return 0;
 }
 
@@ -460,7 +459,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
 	 * chance to fix things.
 	 */
 	if (write_ptr % ETB_FRAME_SIZE_WORDS) {
-		dev_err(drvdata->dev,
+		dev_err(&csdev->dev,
 			"write_ptr: %lu not aligned to formatter frame size\n",
 			(unsigned long)write_ptr);
 
@@ -594,7 +593,7 @@ static void etb_dump(struct etb_drvdata *drvdata)
 	}
 	spin_unlock_irqrestore(&drvdata->spinlock, flags);
 
-	dev_dbg(drvdata->dev, "ETB dumped\n");
+	dev_dbg(&drvdata->csdev->dev, "ETB dumped\n");
 }
 
 static int etb_open(struct inode *inode, struct file *file)
@@ -605,7 +604,7 @@ static int etb_open(struct inode *inode, struct file *file)
 	if (local_cmpxchg(&drvdata->reading, 0, 1))
 		return -EBUSY;
 
-	dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
+	dev_dbg(&drvdata->csdev->dev, "%s: successfully opened\n", __func__);
 	return 0;
 }
 
@@ -615,6 +614,7 @@ static ssize_t etb_read(struct file *file, char __user *data,
 	u32 depth;
 	struct etb_drvdata *drvdata = container_of(file->private_data,
 						   struct etb_drvdata, miscdev);
+	struct device *dev = &drvdata->csdev->dev;
 
 	etb_dump(drvdata);
 
@@ -623,13 +623,14 @@ static ssize_t etb_read(struct file *file, char __user *data,
 		len = depth * 4 - *ppos;
 
 	if (copy_to_user(data, drvdata->buf + *ppos, len)) {
-		dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
+		dev_dbg(dev,
+			"%s: copy_to_user failed\n", __func__);
 		return -EFAULT;
 	}
 
 	*ppos += len;
 
-	dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
+	dev_dbg(dev, "%s: %zu bytes copied, %d bytes left\n",
 		__func__, len, (int)(depth * 4 - *ppos));
 	return len;
 }
@@ -640,7 +641,7 @@ static int etb_release(struct inode *inode, struct file *file)
 						   struct etb_drvdata, miscdev);
 	local_set(&drvdata->reading, 0);
 
-	dev_dbg(drvdata->dev, "%s: released\n", __func__);
+	dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__);
 	return 0;
 }
 
@@ -744,7 +745,6 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->dev = &adev->dev;
 	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);