Date:   Wed, 15 Feb 2017 15:12:28 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Luis Oliveira <Luis.Oliveira@...opsys.com>, wsa@...-dreams.de,
        robh+dt@...nel.org, mark.rutland@....com,
        jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ramiro.Oliveira@...opsys.com, Joao.Pinto@...opsys.com,
        CARLOS.PALMINHA@...opsys.com
Subject: Re: [PATCH v6 1/6] i2c: designware: Cleaning and comment style
 fixes.

On Wed, 2017-02-15 at 12:22 +0000, Luis Oliveira wrote:
> 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.
> 

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Luis Oliveira <lolivei@...opsys.com>
> Acked-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
> ---
> V5->v6
> - Added the replacement of "r" for "ret" return variables, before it
>   was done in the 7th patch
> 
>  drivers/i2c/busses/i2c-designware-core.c    | 86 ++++++++++++++----
> -----------
>  drivers/i2c/busses/i2c-designware-core.h    |  2 +-
>  drivers/i2c/busses/i2c-designware-platdrv.c | 42 +++++++-------
>  3 files changed, 66 insertions(+), 64 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-designware-core.c
> b/drivers/i2c/busses/i2c-designware-core.c
> index a62c14c3b2b7..8cf2a8c54ba9 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.
> @@ -338,14 +338,14 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
>  
>  	reg = dw_readl(dev, DW_IC_COMP_TYPE);
>  	if (reg == ___constant_swab32(DW_IC_COMP_TYPE_VALUE)) {
> -		/* Configure register endianess access */
> +		/* Configure register endianness access */
>  		dev->accessor_flags |= ACCESS_SWAP;
>  	} else if (reg == (DW_IC_COMP_TYPE_VALUE & 0x0000ffff)) {
>  		/* Configure register access mode 16bit */
>  		dev->accessor_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
> */
>  	if (dev->dynamic_tar_update_enabled) {
>  		/*
>  		 * If I2C_DYNAMIC_TAR_UPDATE is set, the 10-bit
> addressing
> @@ -505,7 +505,7 @@ 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 */
> @@ -539,9 +539,9 @@ 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,
> @@ -601,7 +601,7 @@ 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;
>  
> @@ -730,7 +730,7 @@ 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)
> @@ -761,10 +761,10 @@ 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 */
> @@ -788,7 +788,7 @@ 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;
> @@ -823,8 +823,8 @@ 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)
> @@ -905,7 +905,7 @@ 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;
> @@ -927,7 +927,7 @@ 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->accessor_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);
> @@ -962,23 +962,23 @@ EXPORT_SYMBOL_GPL(i2c_dw_read_comp_param);
>  int i2c_dw_probe(struct dw_i2c_dev *dev)
>  {
>  	struct i2c_adapter *adap = &dev->adapter;
> -	int r;
> +	int ret;
>  	u32 reg;
>  
>  	init_completion(&dev->cmd_complete);
>  
> -	r = i2c_dw_init(dev);
> -	if (r)
> -		return r;
> +	ret = i2c_dw_init(dev);
> +	if (ret)
> +		return ret;
>  
> -	r = i2c_dw_acquire_lock(dev);
> -	if (r)
> -		return r;
> +	ret = i2c_dw_acquire_lock(dev);
> +	if (ret)
> +		return ret;
>  
>  	/*
>  	 * Test if dynamic TAR update is enabled in this controller
> by writing
>  	 * to IC_10BITADDR_MASTER field in IC_CON: when it is enabled
> this
> -	 * field is read-only so it should not succeed
> +	 * field is read-only so it should not succeed.
>  	 */
>  	reg = dw_readl(dev, DW_IC_CON);
>  	dw_writel(dev, reg ^ DW_IC_CON_10BITADDR_MASTER, DW_IC_CON);
> @@ -999,13 +999,13 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
>  	i2c_set_adapdata(adap, dev);
>  
>  	i2c_dw_disable_int(dev);
> -	r = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr,
> +	ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr,
>  			     IRQF_SHARED | IRQF_COND_SUSPEND,
>  			     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;
>  	}
>  
>  	/*
> @@ -1015,12 +1015,12 @@ 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 26250b425e2f..00bee4da9beb 100644
> --- a/drivers/i2c/busses/i2c-designware-core.h
> +++ b/drivers/i2c/busses/i2c-designware-core.h
> @@ -48,7 +48,7 @@
>   * @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 6ce431323125..381f0c1058b4 100644
> --- a/drivers/i2c/busses/i2c-designware-platdrv.c
> +++ b/drivers/i2c/busses/i2c-designware-platdrv.c
> @@ -21,26 +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)
> @@ -176,11 +178,11 @@ 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)
> @@ -238,9 +240,9 @@ static int dw_i2c_plat_probe(struct
> platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> -	r = i2c_dw_eval_lock_support(dev);
> -	if (r)
> -		return r;
> +	ret = i2c_dw_eval_lock_support(dev);
> +	if (ret)
> +		return ret;
>  
>  	dev->functionality = I2C_FUNC_10BIT_ADDR |
> DW_IC_DEFAULT_FUNCTIONALITY;
>  
> @@ -285,11 +287,11 @@ static int dw_i2c_plat_probe(struct
> platform_device *pdev)
>  		pm_runtime_enable(&pdev->dev);
>  	}
>  
> -	r = i2c_dw_probe(dev);
> -	if (r && !dev->pm_runtime_disabled)
> +	ret = i2c_dw_probe(dev);
> +	if (ret && !dev->pm_runtime_disabled)
>  		pm_runtime_disable(&pdev->dev);
>  
> -	return r;
> +	return ret;
>  }
>  
>  static int dw_i2c_plat_remove(struct platform_device *pdev)
> @@ -371,7 +373,7 @@ 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 = {

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy

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