[PATCH 00/34] treewide: simplify getting the adapter of an I2C client

[PATCH 00/34] treewide: simplify getting the adapter of an I2C client

[Wolfram Sang]

While preparing a refactoring series, I noticed that some drivers use a
complicated way of determining the adapter of a client. The easy way is
to use the intended pointer: client->adapter

These drivers do:
	to_i2c_adapter(client->dev.parent);

The I2C core populates the parent pointer as:
	client->dev.parent = &client->adapter->dev;

Now take into consideration that
	to_i2c_adapter(&adapter->dev);

is a complicated way of saying 'adapter', then we can even formally
prove that the complicated expression can be simplified by using
client->adapter.

The conversion was done using a coccinelle script with some manual
indentation fixes applied on top.

To avoid a brown paper bag mistake, I double checked this on a Renesas
Salvator-XS board (R-Car M3N) and verified both expression result in the
same pointer. Other than that, the series is only build tested.

A branch can be found here:

git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/no_to_adapter

Please apply the patches to the individual subsystem trees. There are no
dependencies.

Thanks and kind regards,

   Wolfram


Wolfram Sang (34):
  clk: clk-cdce706: simplify getting the adapter of a client
  gpu: drm: bridge: sii9234: simplify getting the adapter of a client
  iio: light: bh1780: simplify getting the adapter of a client
  leds: leds-pca955x: simplify getting the adapter of a client
  leds: leds-tca6507: simplify getting the adapter of a client
  media: i2c: ak881x: simplify getting the adapter of a client
  media: i2c: mt9m001: simplify getting the adapter of a client
  media: i2c: mt9m111: simplify getting the adapter of a client
  media: i2c: mt9p031: simplify getting the adapter of a client
  media: i2c: ov2640: simplify getting the adapter of a client
  media: i2c: tw9910: simplify getting the adapter of a client
  misc: fsa9480: simplify getting the adapter of a client
  misc: isl29003: simplify getting the adapter of a client
  misc: tsl2550: simplify getting the adapter of a client
  mtd: maps: pismo: simplify getting the adapter of a client
  power: supply: bq24190_charger: simplify getting the adapter of a client
  power: supply: bq24257_charger: simplify getting the adapter of a client
  power: supply: bq25890_charger: simplify getting the adapter of a client
  power: supply: max14656_charger_detector: simplify getting the adapter
    of a client
  power: supply: max17040_battery: simplify getting the adapter of a client
  power: supply: max17042_battery: simplify getting the adapter of a client
  power: supply: rt5033_battery: simplify getting the adapter of a client
  power: supply: rt9455_charger: simplify getting the adapter of a client
  power: supply: sbs-manager: simplify getting the adapter of a client
  regulator: max8952: simplify getting the adapter of a client
  rtc: fm3130: simplify getting the adapter of a client
  rtc: m41t80: simplify getting the adapter of a client
  rtc: rv8803: simplify getting the adapter of a client
  rtc: rx8010: simplify getting the adapter of a client
  rtc: rx8025: simplify getting the adapter of a client
  staging: media: soc_camera: imx074: simplify getting the adapter of a client
  staging: media: soc_camera: mt9t031: simplify getting the adapter of a client
  staging: media: soc_camera: soc_mt9v022: simplify getting the adapter
    of a client
  usb: typec: tcpm: fusb302: simplify getting the adapter of a client

 drivers/clk/clk-cdce706.c                        | 2 +-
 drivers/gpu/drm/bridge/sii9234.c                 | 4 ++--
 drivers/iio/light/bh1780.c                       | 2 +-
 drivers/leds/leds-pca955x.c                      | 2 +-
 drivers/leds/leds-tca6507.c                      | 2 +-
 drivers/media/i2c/ak881x.c                       | 2 +-
 drivers/media/i2c/mt9m001.c                      | 2 +-
 drivers/media/i2c/mt9m111.c                      | 2 +-
 drivers/media/i2c/mt9p031.c                      | 2 +-
 drivers/media/i2c/ov2640.c                       | 2 +-
 drivers/media/i2c/tw9910.c                       | 3 +--
 drivers/misc/fsa9480.c                           | 2 +-
 drivers/misc/isl29003.c                          | 2 +-
 drivers/misc/tsl2550.c                           | 2 +-
 drivers/mtd/maps/pismo.c                         | 2 +-
 drivers/power/supply/bq24190_charger.c           | 2 +-
 drivers/power/supply/bq24257_charger.c           | 2 +-
 drivers/power/supply/bq25890_charger.c           | 2 +-
 drivers/power/supply/max14656_charger_detector.c | 2 +-
 drivers/power/supply/max17040_battery.c          | 2 +-
 drivers/power/supply/max17042_battery.c          | 2 +-
 drivers/power/supply/rt5033_battery.c            | 2 +-
 drivers/power/supply/rt9455_charger.c            | 2 +-
 drivers/power/supply/sbs-manager.c               | 2 +-
 drivers/regulator/max8952.c                      | 2 +-
 drivers/rtc/rtc-fm3130.c                         | 8 +++-----
 drivers/rtc/rtc-m41t80.c                         | 2 +-
 drivers/rtc/rtc-rv8803.c                         | 2 +-
 drivers/rtc/rtc-rx8010.c                         | 2 +-
 drivers/rtc/rtc-rx8025.c                         | 2 +-
 drivers/staging/media/soc_camera/imx074.c        | 2 +-
 drivers/staging/media/soc_camera/mt9t031.c       | 2 +-
 drivers/staging/media/soc_camera/soc_mt9v022.c   | 2 +-
 drivers/usb/typec/tcpm/fusb302.c                 | 3 +--
 34 files changed, 37 insertions(+), 41 deletions(-)

-- 
2.19.1

[PATCH 34/34] usb: typec: tcpm: fusb302: simplify getting the adapter of a client

[Wolfram Sang]

We have a dedicated pointer for that, so use it. Much easier to read and
less computation involved.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---

Please apply to your subsystem tree.

 drivers/usb/typec/tcpm/fusb302.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
index 7302f7501ec9..c524088246ee 100644
--- a/drivers/usb/typec/tcpm/fusb302.c
+++ b/drivers/usb/typec/tcpm/fusb302.c
@@ -1697,13 +1697,12 @@ static int fusb302_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct fusb302_chip *chip;
-	struct i2c_adapter *adapter;
+	struct i2c_adapter *adapter = client->adapter;
 	struct device *dev = &client->dev;
 	const char *name;
 	int ret = 0;
 	u32 v;
 
-	adapter = to_i2c_adapter(client->dev.parent);
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
 		dev_err(&client->dev,
 			"I2C/SMBus block functionality not supported!\n");
-- 
2.19.1

Re: [PATCH 34/34] usb: typec: tcpm: fusb302: simplify getting the adapter of a client

[Guenter Roeck]

On 6/8/19 3:56 AM, Wolfram Sang wrote:
> We have a dedicated pointer for that, so use it. Much easier to read and
> less computation involved.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
> 
> Please apply to your subsystem tree.
> 
>   drivers/usb/typec/tcpm/fusb302.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
> index 7302f7501ec9..c524088246ee 100644
> --- a/drivers/usb/typec/tcpm/fusb302.c
> +++ b/drivers/usb/typec/tcpm/fusb302.c
> @@ -1697,13 +1697,12 @@ static int fusb302_probe(struct i2c_client *client,
>   			 const struct i2c_device_id *id)
>   {
>   	struct fusb302_chip *chip;
> -	struct i2c_adapter *adapter;
> +	struct i2c_adapter *adapter = client->adapter;
>   	struct device *dev = &client->dev;
>   	const char *name;
>   	int ret = 0;
>   	u32 v;
>   
> -	adapter = to_i2c_adapter(client->dev.parent);
>   	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
>   		dev_err(&client->dev,
>   			"I2C/SMBus block functionality not supported!\n");
> 

Re: [PATCH 00/34] treewide: simplify getting the adapter of an I2C client

[Peter Rosin]

On 2019-06-08 12:55, Wolfram Sang wrote:
> While preparing a refactoring series, I noticed that some drivers use a
> complicated way of determining the adapter of a client. The easy way is
> to use the intended pointer: client->adapter
> 
> These drivers do:
> 	to_i2c_adapter(client->dev.parent);
> 
> The I2C core populates the parent pointer as:
> 	client->dev.parent = &client->adapter->dev;
> 
> Now take into consideration that
> 	to_i2c_adapter(&adapter->dev);
> 
> is a complicated way of saying 'adapter', then we can even formally
> prove that the complicated expression can be simplified by using
> client->adapter.
> 
> The conversion was done using a coccinelle script with some manual
> indentation fixes applied on top.
> 
> To avoid a brown paper bag mistake, I double checked this on a Renesas
> Salvator-XS board (R-Car M3N) and verified both expression result in the
> same pointer. Other than that, the series is only build tested.

Similar things go on in:

drivers/hwmon/lm90.c
drivers/leds/leds-is31fl319x.c
drivers/of/unittest.c

Those have this pattern:

	struct device *dev = &client->dev;
	struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);

And drivers/rtc/rtc-fm3130.c has a couple of these:

	tmp = i2c_transfer(to_i2c_adapter(fm3130->client->dev.parent),
			...);

where fm3130->client is of type "struct i2c_client *"

Cheers,
Peter

Re: [PATCH 00/34] treewide: simplify getting the adapter of an I2C client

[Wolfram Sang]

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Hi Peter,

> Similar things go on in:
> 
> drivers/hwmon/lm90.c
> drivers/leds/leds-is31fl319x.c
> drivers/of/unittest.c

Right. I'll fix them, too.

> And drivers/rtc/rtc-fm3130.c has a couple of these:

These are fixed in patch 26 of this series.

Thanks and happy hacking,

   Wolfram

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Re: [PATCH 34/34] usb: typec: tcpm: fusb302: simplify getting the adapter of a client

[Simon Horman]

On Sat, Jun 08, 2019 at 05:59:17AM -0700, Guenter Roeck wrote:
> On 6/8/19 3:56 AM, Wolfram Sang wrote:
> > We have a dedicated pointer for that, so use it. Much easier to read and
> > less computation involved.
> > 
> > Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> 
> Reviewed-by: Guenter Roeck <linux@roeck-us.net>

Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

> 
> > ---
> > 
> > Please apply to your subsystem tree.
> > 
> >   drivers/usb/typec/tcpm/fusb302.c | 3 +--
> >   1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
> > index 7302f7501ec9..c524088246ee 100644
> > --- a/drivers/usb/typec/tcpm/fusb302.c
> > +++ b/drivers/usb/typec/tcpm/fusb302.c
> > @@ -1697,13 +1697,12 @@ static int fusb302_probe(struct i2c_client *client,
> >   			 const struct i2c_device_id *id)
> >   {
> >   	struct fusb302_chip *chip;
> > -	struct i2c_adapter *adapter;
> > +	struct i2c_adapter *adapter = client->adapter;
> >   	struct device *dev = &client->dev;
> >   	const char *name;
> >   	int ret = 0;
> >   	u32 v;
> > -	adapter = to_i2c_adapter(client->dev.parent);
> >   	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
> >   		dev_err(&client->dev,
> >   			"I2C/SMBus block functionality not supported!\n");
> > 
> 

Re: [PATCH 00/34] treewide: simplify getting the adapter of an I2C client

[Sebastian Reichel]

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Hi,

On Sat, Jun 08, 2019 at 12:55:39PM +0200, Wolfram Sang wrote:
> While preparing a refactoring series, I noticed that some drivers use a
> complicated way of determining the adapter of a client. The easy way is
> to use the intended pointer: client->adapter
> 
> These drivers do:
> 	to_i2c_adapter(client->dev.parent);
> 
> The I2C core populates the parent pointer as:
> 	client->dev.parent = &client->adapter->dev;
> 
> Now take into consideration that
> 	to_i2c_adapter(&adapter->dev);
> 
> is a complicated way of saying 'adapter', then we can even formally
> prove that the complicated expression can be simplified by using
> client->adapter.
> 
> The conversion was done using a coccinelle script with some manual
> indentation fixes applied on top.
> 
> To avoid a brown paper bag mistake, I double checked this on a Renesas
> Salvator-XS board (R-Car M3N) and verified both expression result in the
> same pointer. Other than that, the series is only build tested.
> 
> A branch can be found here:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/no_to_adapter
> 
> Please apply the patches to the individual subsystem trees. There are no
> dependencies.
> 
> Thanks and kind regards,
> 
>    Wolfram

Thanks, I queued the patches prefixed with "power: supply: [...]".

-- Sebastian

> Wolfram Sang (34):
>   clk: clk-cdce706: simplify getting the adapter of a client
>   gpu: drm: bridge: sii9234: simplify getting the adapter of a client
>   iio: light: bh1780: simplify getting the adapter of a client
>   leds: leds-pca955x: simplify getting the adapter of a client
>   leds: leds-tca6507: simplify getting the adapter of a client
>   media: i2c: ak881x: simplify getting the adapter of a client
>   media: i2c: mt9m001: simplify getting the adapter of a client
>   media: i2c: mt9m111: simplify getting the adapter of a client
>   media: i2c: mt9p031: simplify getting the adapter of a client
>   media: i2c: ov2640: simplify getting the adapter of a client
>   media: i2c: tw9910: simplify getting the adapter of a client
>   misc: fsa9480: simplify getting the adapter of a client
>   misc: isl29003: simplify getting the adapter of a client
>   misc: tsl2550: simplify getting the adapter of a client
>   mtd: maps: pismo: simplify getting the adapter of a client
>   power: supply: bq24190_charger: simplify getting the adapter of a client
>   power: supply: bq24257_charger: simplify getting the adapter of a client
>   power: supply: bq25890_charger: simplify getting the adapter of a client
>   power: supply: max14656_charger_detector: simplify getting the adapter
>     of a client
>   power: supply: max17040_battery: simplify getting the adapter of a client
>   power: supply: max17042_battery: simplify getting the adapter of a client
>   power: supply: rt5033_battery: simplify getting the adapter of a client
>   power: supply: rt9455_charger: simplify getting the adapter of a client
>   power: supply: sbs-manager: simplify getting the adapter of a client
>   regulator: max8952: simplify getting the adapter of a client
>   rtc: fm3130: simplify getting the adapter of a client
>   rtc: m41t80: simplify getting the adapter of a client
>   rtc: rv8803: simplify getting the adapter of a client
>   rtc: rx8010: simplify getting the adapter of a client
>   rtc: rx8025: simplify getting the adapter of a client
>   staging: media: soc_camera: imx074: simplify getting the adapter of a client
>   staging: media: soc_camera: mt9t031: simplify getting the adapter of a client
>   staging: media: soc_camera: soc_mt9v022: simplify getting the adapter
>     of a client
>   usb: typec: tcpm: fusb302: simplify getting the adapter of a client
> 
>  drivers/clk/clk-cdce706.c                        | 2 +-
>  drivers/gpu/drm/bridge/sii9234.c                 | 4 ++--
>  drivers/iio/light/bh1780.c                       | 2 +-
>  drivers/leds/leds-pca955x.c                      | 2 +-
>  drivers/leds/leds-tca6507.c                      | 2 +-
>  drivers/media/i2c/ak881x.c                       | 2 +-
>  drivers/media/i2c/mt9m001.c                      | 2 +-
>  drivers/media/i2c/mt9m111.c                      | 2 +-
>  drivers/media/i2c/mt9p031.c                      | 2 +-
>  drivers/media/i2c/ov2640.c                       | 2 +-
>  drivers/media/i2c/tw9910.c                       | 3 +--
>  drivers/misc/fsa9480.c                           | 2 +-
>  drivers/misc/isl29003.c                          | 2 +-
>  drivers/misc/tsl2550.c                           | 2 +-
>  drivers/mtd/maps/pismo.c                         | 2 +-
>  drivers/power/supply/bq24190_charger.c           | 2 +-
>  drivers/power/supply/bq24257_charger.c           | 2 +-
>  drivers/power/supply/bq25890_charger.c           | 2 +-
>  drivers/power/supply/max14656_charger_detector.c | 2 +-
>  drivers/power/supply/max17040_battery.c          | 2 +-
>  drivers/power/supply/max17042_battery.c          | 2 +-
>  drivers/power/supply/rt5033_battery.c            | 2 +-
>  drivers/power/supply/rt9455_charger.c            | 2 +-
>  drivers/power/supply/sbs-manager.c               | 2 +-
>  drivers/regulator/max8952.c                      | 2 +-
>  drivers/rtc/rtc-fm3130.c                         | 8 +++-----
>  drivers/rtc/rtc-m41t80.c                         | 2 +-
>  drivers/rtc/rtc-rv8803.c                         | 2 +-
>  drivers/rtc/rtc-rx8010.c                         | 2 +-
>  drivers/rtc/rtc-rx8025.c                         | 2 +-
>  drivers/staging/media/soc_camera/imx074.c        | 2 +-
>  drivers/staging/media/soc_camera/mt9t031.c       | 2 +-
>  drivers/staging/media/soc_camera/soc_mt9v022.c   | 2 +-
>  drivers/usb/typec/tcpm/fusb302.c                 | 3 +--
>  34 files changed, 37 insertions(+), 41 deletions(-)
> 
> -- 
> 2.19.1
> 

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