[PATCH v10 1/6] i2c: designware: Cleaning and comment style fixes.

[Luis Oliveira <Luis.Oliveira@synopsys.com>]

The purpose of this commit is to fix some comments and styling in the
existing code due to the need of reuse this code. What is being made
here is:

- Sorted the headers files
- Corrected some comments style (capital letters, lowcase i2c)
- Reverse tree in the variables declaration
- Add/remove empty lines and tabs where needed
- Fix of misspelled word "endianness" and "transferred"
- Replaced the return variable "r" with the more standard "ret"

The value of this, besides the rules of coding style, is because I
will use this code after and it will make my future patch a lot bigger and
complicated to review. The work here won't bring any additional work to
backported fixes because is just style and reordering.

Signed-off-by: Luis Oliveira <lolivei@synopsys.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v9-v10
- no changes

 drivers/i2c/busses/i2c-designware-core.c    | 76 ++++++++++++++---------------
 drivers/i2c/busses/i2c-designware-core.h    |  2 +-
 drivers/i2c/busses/i2c-designware-platdrv.c | 43 ++++++++--------
 3 files changed, 61 insertions(+), 60 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 3c41995634c2..efe211e8aac5 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -21,17 +21,17 @@
  * ----------------------------------------------------------------------------
  *
  */
+#include <linux/delay.h>
 #include <linux/export.h>
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/pm_runtime.h>
-#include <linux/delay.h>
 #include <linux/module.h>
-#include "i2c-designware-core.h"
+#include <linux/pm_runtime.h>
 
+#include "i2c-designware-core.h"
 /*
  * Registers offset
  */
@@ -98,7 +98,7 @@
 
 #define DW_IC_ERR_TX_ABRT	0x1
 
-#define DW_IC_TAR_10BITADDR_MASTER BIT(12)
+#define DW_IC_TAR_10BITADDR_MASTER		BIT(12)
 
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_HIGH	(BIT(2) | BIT(3))
 #define DW_IC_COMP_PARAM_1_SPEED_MODE_MASK	GENMASK(3, 2)
@@ -113,10 +113,10 @@
 #define TIMEOUT			20 /* ms */
 
 /*
- * hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
+ * Hardware abort codes from the DW_IC_TX_ABRT_SOURCE register
  *
- * only expected abort codes are listed here
- * refer to the datasheet for the full list
+ * Only expected abort codes are listed here,
+ * refer to the datasheet for the full list.
  */
 #define ABRT_7B_ADDR_NOACK	0
 #define ABRT_10ADDR1_NOACK	1
@@ -318,7 +318,7 @@ static void i2c_dw_release_lock(struct dw_i2c_dev *dev)
 }
 
 /**
- * i2c_dw_init() - initialize the designware i2c master hardware
+ * i2c_dw_init() - Initialize the designware I2C master hardware
  * @dev: device private data
  *
  * This functions configures and enables the I2C master.
@@ -344,8 +344,8 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 		/* Configure register access mode 16bit */
 		dev->flags |= ACCESS_16BIT;
 	} else if (reg != DW_IC_COMP_TYPE_VALUE) {
-		dev_err(dev->dev, "Unknown Synopsys component type: "
-			"0x%08x\n", reg);
+		dev_err(dev->dev,
+			"Unknown Synopsys component type: 0x%08x\n", reg);
 		i2c_dw_release_lock(dev);
 		return -ENODEV;
 	}
@@ -355,7 +355,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 	/* Disable the adapter */
 	__i2c_dw_enable_and_wait(dev, false);
 
-	/* set standard and fast speed deviders for high/low periods */
+	/* Set standard and fast speed deviders for high/low periods */
 
 	sda_falling_time = dev->sda_falling_time ?: 300; /* ns */
 	scl_falling_time = dev->scl_falling_time ?: 300; /* ns */
@@ -444,7 +444,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
 	dw_writel(dev, dev->tx_fifo_depth / 2, DW_IC_TX_TL);
 	dw_writel(dev, 0, DW_IC_RX_TL);
 
-	/* configure the i2c master */
+	/* Configure the I2C master */
 	dw_writel(dev, dev->master_cfg , DW_IC_CON);
 
 	i2c_dw_release_lock(dev);
@@ -480,7 +480,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
 	/* Disable the adapter */
 	__i2c_dw_enable_and_wait(dev, false);
 
-	/* if the slave address is ten bit address, enable 10BITADDR */
+	/* If the slave address is ten bit address, enable 10BITADDR */
 	ic_con = dw_readl(dev, DW_IC_CON);
 	if (msgs[dev->msg_write_idx].flags & I2C_M_TEN) {
 		ic_con |= DW_IC_CON_10BITADDR_MASTER;
@@ -503,7 +503,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
 	 */
 	dw_writel(dev, msgs[dev->msg_write_idx].addr | ic_tar, DW_IC_TAR);
 
-	/* enforce disabled interrupts (due to HW issues) */
+	/* Enforce disabled interrupts (due to HW issues) */
 	i2c_dw_disable_int(dev);
 
 	/* Enable the adapter */
@@ -537,9 +537,9 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
 		u32 flags = msgs[dev->msg_write_idx].flags;
 
 		/*
-		 * if target address has changed, we need to
-		 * reprogram the target address in the i2c
-		 * adapter when we are done with this transfer
+		 * If target address has changed, we need to
+		 * reprogram the target address in the I2C
+		 * adapter when we are done with this transfer.
 		 */
 		if (msgs[dev->msg_write_idx].addr != addr) {
 			dev_err(dev->dev,
@@ -599,7 +599,7 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev)
 
 			if (msgs[dev->msg_write_idx].flags & I2C_M_RD) {
 
-				/* avoid rx buffer overrun */
+				/* Avoid rx buffer overrun */
 				if (dev->rx_outstanding >= dev->rx_fifo_depth)
 					break;
 
@@ -728,7 +728,7 @@ static int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev)
 }
 
 /*
- * Prepare controller for a transaction and call i2c_dw_xfer_msg
+ * Prepare controller for a transaction and call i2c_dw_xfer_msg.
  */
 static int
 i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
@@ -759,10 +759,10 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	if (ret < 0)
 		goto done;
 
-	/* start the transfers */
+	/* Start the transfers */
 	i2c_dw_xfer_init(dev);
 
-	/* wait for tx to complete */
+	/* Wait for tx to complete */
 	if (!wait_for_completion_timeout(&dev->cmd_complete, adap->timeout)) {
 		dev_err(dev->dev, "controller timed out\n");
 		/* i2c_dw_init implicitly disables the adapter */
@@ -786,7 +786,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 		goto done;
 	}
 
-	/* no error */
+	/* No error */
 	if (likely(!dev->cmd_err && !dev->status)) {
 		ret = num;
 		goto done;
@@ -821,8 +821,8 @@ static u32 i2c_dw_func(struct i2c_adapter *adap)
 }
 
 static const struct i2c_algorithm i2c_dw_algo = {
-	.master_xfer	= i2c_dw_xfer,
-	.functionality	= i2c_dw_func,
+	.master_xfer = i2c_dw_xfer,
+	.functionality = i2c_dw_func,
 };
 
 static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
@@ -903,7 +903,7 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 
 		/*
 		 * Anytime TX_ABRT is set, the contents of the tx/rx
-		 * buffers are flushed.  Make sure to skip them.
+		 * buffers are flushed. Make sure to skip them.
 		 */
 		dw_writel(dev, 0, DW_IC_INTR_MASK);
 		goto tx_aborted;
@@ -925,7 +925,7 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 	if ((stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) || dev->msg_err)
 		complete(&dev->cmd_complete);
 	else if (unlikely(dev->flags & ACCESS_INTR_MASK)) {
-		/* workaround to trigger pending interrupt */
+		/* Workaround to trigger pending interrupt */
 		stat = dw_readl(dev, DW_IC_INTR_MASK);
 		i2c_dw_disable_int(dev);
 		dw_writel(dev, stat, DW_IC_INTR_MASK);
@@ -961,13 +961,13 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
 {
 	struct i2c_adapter *adap = &dev->adapter;
 	unsigned long irq_flags;
-	int r;
+	int ret;
 
 	init_completion(&dev->cmd_complete);
 
-	r = i2c_dw_init(dev);
-	if (r)
-		return r;
+	ret = i2c_dw_init(dev);
+	if (ret)
+		return ret;
 
 	snprintf(adap->name, sizeof(adap->name),
 		 "Synopsys DesignWare I2C adapter");
@@ -984,12 +984,12 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
 	}
 
 	i2c_dw_disable_int(dev);
-	r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
+	ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr, irq_flags,
 			     dev_name(dev->dev), dev);
-	if (r) {
+	if (ret) {
 		dev_err(dev->dev, "failure requesting irq %i: %d\n",
-			dev->irq, r);
-		return r;
+			dev->irq, ret);
+		return ret;
 	}
 
 	/*
@@ -999,12 +999,12 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
 	 * registered I2C slaves that do I2C transfers in their probe.
 	 */
 	pm_runtime_get_noresume(dev->dev);
-	r = i2c_add_numbered_adapter(adap);
-	if (r)
-		dev_err(dev->dev, "failure adding adapter: %d\n", r);
+	ret = i2c_add_numbered_adapter(adap);
+	if (ret)
+		dev_err(dev->dev, "failure adding adapter: %d\n", ret);
 	pm_runtime_put_noidle(dev->dev);
 
-	return r;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(i2c_dw_probe);
 
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index a7cf429daf60..fe9b66898a72 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -49,7 +49,7 @@
  * @cmd_complete: tx completion indicator
  * @clk: input reference clock
  * @cmd_err: run time hadware error code
- * @msgs: points to an array of messages currently being transfered
+ * @msgs: points to an array of messages currently being transferred
  * @msgs_num: the number of elements in msgs
  * @msg_write_idx: the element index of the current tx message in the msgs
  *	array
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index d1263b82d646..613dfb88307f 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -21,27 +21,28 @@
  * ----------------------------------------------------------------------------
  *
  */
-#include <linux/kernel.h>
-#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dmi.h>
-#include <linux/i2c.h>
-#include <linux/clk.h>
-#include <linux/clk-provider.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
 #include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
 #include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/of.h>
+#include <linux/platform_data/i2c-designware.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/property.h>
-#include <linux/io.h>
 #include <linux/reset.h>
+#include <linux/sched.h>
 #include <linux/slab.h>
-#include <linux/acpi.h>
-#include <linux/platform_data/i2c-designware.h>
+
 #include "i2c-designware-core.h"
 
 static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
@@ -209,11 +210,11 @@ static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev, int id)
 static int dw_i2c_plat_probe(struct platform_device *pdev)
 {
 	struct dw_i2c_platform_data *pdata = dev_get_platdata(&pdev->dev);
-	struct dw_i2c_dev *dev;
 	struct i2c_adapter *adap;
-	struct resource *mem;
-	int irq, r;
+	struct dw_i2c_dev *dev;
 	u32 acpi_speed, ht = 0;
+	struct resource *mem;
+	int irq, ret;
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
@@ -276,12 +277,12 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 	    && dev->clk_freq != 1000000 && dev->clk_freq != 3400000) {
 		dev_err(&pdev->dev,
 			"Only 100kHz, 400kHz, 1MHz and 3.4MHz supported");
-		r = -EINVAL;
+		ret = -EINVAL;
 		goto exit_reset;
 	}
 
-	r = i2c_dw_probe_lock_support(dev);
-	if (r)
+	ret = i2c_dw_probe_lock_support(dev);
+	if (ret)
 		goto exit_reset;
 
 	dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY;
@@ -327,11 +328,11 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 		pm_runtime_enable(&pdev->dev);
 	}
 
-	r = i2c_dw_probe(dev);
-	if (r)
+	ret = i2c_dw_probe(dev);
+	if (ret)
 		goto exit_probe;
 
-	return r;
+	return ret;
 
 exit_probe:
 	if (!dev->pm_disabled)
@@ -339,7 +340,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 exit_reset:
 	if (!IS_ERR_OR_NULL(dev->rst))
 		reset_control_assert(dev->rst);
-	return r;
+	return ret;
 }
 
 static int dw_i2c_plat_remove(struct platform_device *pdev)
@@ -423,7 +424,7 @@ static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
 #define DW_I2C_DEV_PMOPS NULL
 #endif
 
-/* work with hotplug and coldplug */
+/* Work with hotplug and coldplug */
 MODULE_ALIAS("platform:i2c_designware");
 
 static struct platform_driver dw_i2c_driver = {
-- 
2.13.0