From: Arnd Bergmann <arnd@arndb.de>

As part of my cleanup of old platforms, I had a look at all drivers that
may have become unused because the last platform_data or DT definition
was removed, or because of unmet Kconfig dependencies.

These are all the mfd drivers I found. The first ten in the list
actually turned out to have been unusable long before my series, and
I have added explanations on how I determined this in each patch. The
last four patches are still in use in linux-7.3 but become unused after
my series [1] that I hope to get merged for 7.4.

Somewhat unorthodox, I took a shortcut here and remove both the mfd drivers
and the corresponding subsystem drivers (gpio, hwmon, iio, input, led,
media, power, regulator, rtc, video, watchdog, asoc) in a combined patch,
to simplify the interdependencies: removing just the mfd driver would
leave unselectable or broken drivers in other subsystems.  I also have
additional patches for each of the other subsystems, currently a total
of 300 patches, many of which still need better testing or proper
changelog texts.

Please let me know if you all think this approach is ok, or if I should
explode this further and turn these 14 patches into 70 individual ones
by splitting them per subsystem.

See [2] for the current state of the overall series.

     Arnd

[1] https://lore.kernel.org/lkml/20260908152808.3928630-1-arnd@kernel.org/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git/log/?h=board-remove-7.3

Arnd Bergmann (14):
  mfd: remove unused 88pm80x driver
  mfd: remove unused rdc321x southbridge support
  mfd: remove unused si476x driver
  mfd: remove unused wm8400 driver
  mfd: remove unused adp5520 driver
  mfd: remove unused da903x driver
  mfd: remove unused lp8788 driver
  mfd: remove unused aat2870 driver
  mfd: remove unused lm3533 driver
  mfd: remove unused rc5t583 driver
  mfd: remove unused wm8350 driver
  mfd: remove unused mcp-sa11x0/ucb1x00 driver
  mfd: remove unused menelaus driver
  mfd: remove unused iPaq micro driver

 .../ABI/testing/sysfs-class-backlight         |   11 -
 Documentation/admin-guide/devices.txt         |    1 -
 .../admin-guide/media/radio-cardlist.rst      |    1 -
 Documentation/admin-guide/media/si476x.rst    |  160 --
 .../admin-guide/media/v4l-drivers.rst         |    1 -
 .../devicetree/bindings/regulator/88pm800.txt |   38 -
 Documentation/hwmon/index.rst                 |    1 -
 Documentation/hwmon/wm8350.rst                |   30 -
 .../watchdog/watchdog-parameters.rst          |    7 -
 MAINTAINERS                                   |   14 -
 drivers/gpio/Kconfig                          |   22 -
 drivers/gpio/Makefile                         |    3 -
 drivers/gpio/gpio-adp5520.c                   |  169 --
 drivers/gpio/gpio-rdc321x.c                   |  199 --
 drivers/gpio/gpio-wm8350.c                    |  144 --
 drivers/hwmon/Kconfig                         |   10 -
 drivers/hwmon/Makefile                        |    1 -
 drivers/hwmon/wm8350-hwmon.c                  |   92 -
 drivers/iio/adc/Kconfig                       |    9 -
 drivers/iio/adc/Makefile                      |    1 -
 drivers/iio/adc/lp8788_adc.c                  |  219 ---
 drivers/iio/light/Kconfig                     |   17 -
 drivers/iio/light/Makefile                    |    1 -
 drivers/iio/light/lm3533-als.c                |  922 ----------
 drivers/input/keyboard/Kconfig                |   10 -
 drivers/input/keyboard/Makefile               |    1 -
 drivers/input/keyboard/adp5520-keys.c         |  191 --
 drivers/input/misc/88pm80x_onkey.c            |  152 --
 drivers/input/misc/Kconfig                    |   10 -
 drivers/input/misc/Makefile                   |    1 -
 drivers/input/touchscreen/Kconfig             |   13 -
 drivers/input/touchscreen/Makefile            |    1 -
 drivers/input/touchscreen/da9034-ts.c         |  365 ----
 drivers/leds/Kconfig                          |   47 -
 drivers/leds/Makefile                         |    5 -
 drivers/leds/leds-adp5520.c                   |  195 --
 drivers/leds/leds-da903x.c                    |  145 --
 drivers/leds/leds-lm3533.c                    |  755 --------
 drivers/leds/leds-lp8788.c                    |  171 --
 drivers/leds/leds-wm8350.c                    |  267 ---
 drivers/media/radio/Kconfig                   |   17 -
 drivers/media/radio/Makefile                  |    1 -
 drivers/media/radio/radio-si476x.c            | 1523 ---------------
 drivers/mfd/88pm800.c                         |  619 -------
 drivers/mfd/88pm805.c                         |  275 ---
 drivers/mfd/88pm80x.c                         |  159 --
 drivers/mfd/Kconfig                           |  186 --
 drivers/mfd/Makefile                          |   28 -
 drivers/mfd/aat2870-core.c                    |  458 -----
 drivers/mfd/adp5520.c                         |  346 ----
 drivers/mfd/da903x.c                          |  565 ------
 drivers/mfd/ipaq-micro.c                      |  442 -----
 drivers/mfd/lm3533-core.c                     |  635 -------
 drivers/mfd/lm3533-ctrlbank.c                 |  162 --
 drivers/mfd/lp8788-irq.c                      |  194 --
 drivers/mfd/lp8788.c                          |  246 ---
 drivers/mfd/mcp-core.c                        |  235 ---
 drivers/mfd/mcp-sa11x0.c                      |  304 ---
 drivers/mfd/menelaus.c                        | 1251 -------------
 drivers/mfd/rc5t583-irq.c                     |  383 ----
 drivers/mfd/rc5t583.c                         |  299 ---
 drivers/mfd/rdc321x-southbridge.c             |   96 -
 drivers/mfd/si476x-cmd.c                      | 1543 ----------------
 drivers/mfd/si476x-i2c.c                      |  861 ---------
 drivers/mfd/si476x-prop.c                     |  233 ---
 drivers/mfd/ucb1x00-assabet.c                 |  175 --
 drivers/mfd/ucb1x00-core.c                    |  795 --------
 drivers/mfd/ucb1x00-ts.c                      |  445 -----
 drivers/mfd/wm8350-core.c                     |  444 -----
 drivers/mfd/wm8350-gpio.c                     |  217 ---
 drivers/mfd/wm8350-i2c.c                      |   64 -
 drivers/mfd/wm8350-irq.c                      |  542 ------
 drivers/mfd/wm8350-regmap.c                   |  335 ----
 drivers/mfd/wm8400-core.c                     |  163 --
 drivers/power/supply/Kconfig                  |   22 -
 drivers/power/supply/Makefile                 |    3 -
 drivers/power/supply/da9030_battery.c         |  581 ------
 drivers/power/supply/lp8788-charger.c         |  730 --------
 drivers/power/supply/wm8350_power.c           |  590 ------
 drivers/regulator/88pm800-regulator.c         |  287 ---
 drivers/regulator/Kconfig                     |   55 -
 drivers/regulator/Makefile                    |    8 -
 drivers/regulator/aat2870-regulator.c         |  201 --
 drivers/regulator/da903x-regulator.c          |  495 -----
 drivers/regulator/lp8788-buck.c               |  541 ------
 drivers/regulator/lp8788-ldo.c                |  640 -------
 drivers/regulator/rc5t583-regulator.c         |  171 --
 drivers/regulator/wm8350-regulator.c          | 1330 -------------
 drivers/regulator/wm8400-regulator.c          |  276 ---
 drivers/rtc/Kconfig                           |   45 -
 drivers/rtc/Makefile                          |    3 -
 drivers/rtc/rtc-88pm80x.c                     |  340 ----
 drivers/rtc/rtc-lp8788.c                      |  322 ----
 drivers/rtc/rtc-rc5t583.c                     |  312 ----
 drivers/rtc/rtc-wm8350.c                      |  474 -----
 drivers/video/backlight/Kconfig               |   41 -
 drivers/video/backlight/Makefile              |    5 -
 drivers/video/backlight/aat2870_bl.c          |  206 ---
 drivers/video/backlight/adp5520_bl.c          |  385 ----
 drivers/video/backlight/da903x_bl.c           |  160 --
 drivers/video/backlight/lm3533_bl.c           |  398 ----
 drivers/video/backlight/lp8788_bl.c           |  190 --
 drivers/watchdog/Kconfig                      |   19 -
 drivers/watchdog/Makefile                     |    2 -
 drivers/watchdog/rdc321x_wdt.c                |  281 ---
 drivers/watchdog/wm8350_wdt.c                 |  171 --
 include/linux/mfd/88pm80x.h                   |  370 ----
 include/linux/mfd/aat2870.h                   |  164 --
 include/linux/mfd/adp5520.h                   |  298 ---
 include/linux/mfd/lm3533.h                    |   99 -
 include/linux/mfd/lp8788-isink.h              |   48 -
 include/linux/mfd/lp8788.h                    |  289 ---
 include/linux/mfd/mcp.h                       |   63 -
 include/linux/mfd/menelaus.h                  |   41 -
 include/linux/mfd/rc5t583.h                   |  369 ----
 include/linux/mfd/rdc321x.h                   |   27 -
 include/linux/mfd/si476x-core.h               |  532 ------
 include/linux/mfd/si476x-platform.h           |  256 ---
 include/linux/mfd/si476x-reports.h            |  154 --
 include/linux/mfd/ucb1x00.h                   |  261 ---
 include/linux/mfd/wm8350/audio.h              |  620 -------
 include/linux/mfd/wm8350/comparator.h         |  171 --
 include/linux/mfd/wm8350/core.h               |  692 -------
 include/linux/mfd/wm8350/gpio.h               |  356 ----
 include/linux/mfd/wm8350/pmic.h               |  775 --------
 include/linux/mfd/wm8350/rtc.h                |  265 ---
 include/linux/mfd/wm8350/supply.h             |  129 --
 include/linux/mfd/wm8350/wdt.h                |   24 -
 include/linux/mfd/wm8400-audio.h              | 1174 ------------
 include/linux/mfd/wm8400-private.h            |  913 ---------
 include/linux/mfd/wm8400.h                    |   27 -
 include/linux/platform_data/mfd-mcp-sa11x0.h  |   17 -
 include/media/drv-intf/si476x.h               |   28 -
 include/uapi/linux/v4l2-controls.h            |    4 +-
 sound/soc/codecs/Kconfig                      |   16 -
 sound/soc/codecs/Makefile                     |    6 -
 sound/soc/codecs/si476x.c                     |  263 ---
 sound/soc/codecs/wm8350.c                     | 1638 -----------------
 sound/soc/codecs/wm8350.h                     |   25 -
 sound/soc/codecs/wm8400.c                     | 1348 --------------
 sound/soc/codecs/wm8400.h                     |   54 -
 sound/soc/fsl/fsl-asoc-card.c                 |    8 -
 142 files changed, 2 insertions(+), 39449 deletions(-)
 delete mode 100644 Documentation/admin-guide/media/si476x.rst
 delete mode 100644 Documentation/devicetree/bindings/regulator/88pm800.txt
 delete mode 100644 Documentation/hwmon/wm8350.rst
 delete mode 100644 drivers/gpio/gpio-adp5520.c
 delete mode 100644 drivers/gpio/gpio-rdc321x.c
 delete mode 100644 drivers/gpio/gpio-wm8350.c
 delete mode 100644 drivers/hwmon/wm8350-hwmon.c
 delete mode 100644 drivers/iio/adc/lp8788_adc.c
 delete mode 100644 drivers/iio/light/lm3533-als.c
 delete mode 100644 drivers/input/keyboard/adp5520-keys.c
 delete mode 100644 drivers/input/misc/88pm80x_onkey.c
 delete mode 100644 drivers/input/touchscreen/da9034-ts.c
 delete mode 100644 drivers/leds/leds-adp5520.c
 delete mode 100644 drivers/leds/leds-da903x.c
 delete mode 100644 drivers/leds/leds-lm3533.c
 delete mode 100644 drivers/leds/leds-lp8788.c
 delete mode 100644 drivers/leds/leds-wm8350.c
 delete mode 100644 drivers/media/radio/radio-si476x.c
 delete mode 100644 drivers/mfd/88pm800.c
 delete mode 100644 drivers/mfd/88pm805.c
 delete mode 100644 drivers/mfd/88pm80x.c
 delete mode 100644 drivers/mfd/aat2870-core.c
 delete mode 100644 drivers/mfd/adp5520.c
 delete mode 100644 drivers/mfd/da903x.c
 delete mode 100644 drivers/mfd/ipaq-micro.c
 delete mode 100644 drivers/mfd/lm3533-core.c
 delete mode 100644 drivers/mfd/lm3533-ctrlbank.c
 delete mode 100644 drivers/mfd/lp8788-irq.c
 delete mode 100644 drivers/mfd/lp8788.c
 delete mode 100644 drivers/mfd/mcp-core.c
 delete mode 100644 drivers/mfd/mcp-sa11x0.c
 delete mode 100644 drivers/mfd/menelaus.c
 delete mode 100644 drivers/mfd/rc5t583-irq.c
 delete mode 100644 drivers/mfd/rc5t583.c
 delete mode 100644 drivers/mfd/rdc321x-southbridge.c
 delete mode 100644 drivers/mfd/si476x-cmd.c
 delete mode 100644 drivers/mfd/si476x-i2c.c
 delete mode 100644 drivers/mfd/si476x-prop.c
 delete mode 100644 drivers/mfd/ucb1x00-assabet.c
 delete mode 100644 drivers/mfd/ucb1x00-core.c
 delete mode 100644 drivers/mfd/ucb1x00-ts.c
 delete mode 100644 drivers/mfd/wm8350-core.c
 delete mode 100644 drivers/mfd/wm8350-gpio.c
 delete mode 100644 drivers/mfd/wm8350-i2c.c
 delete mode 100644 drivers/mfd/wm8350-irq.c
 delete mode 100644 drivers/mfd/wm8350-regmap.c
 delete mode 100644 drivers/mfd/wm8400-core.c
 delete mode 100644 drivers/power/supply/da9030_battery.c
 delete mode 100644 drivers/power/supply/lp8788-charger.c
 delete mode 100644 drivers/power/supply/wm8350_power.c
 delete mode 100644 drivers/regulator/88pm800-regulator.c
 delete mode 100644 drivers/regulator/aat2870-regulator.c
 delete mode 100644 drivers/regulator/da903x-regulator.c
 delete mode 100644 drivers/regulator/lp8788-buck.c
 delete mode 100644 drivers/regulator/lp8788-ldo.c
 delete mode 100644 drivers/regulator/rc5t583-regulator.c
 delete mode 100644 drivers/regulator/wm8350-regulator.c
 delete mode 100644 drivers/regulator/wm8400-regulator.c
 delete mode 100644 drivers/rtc/rtc-88pm80x.c
 delete mode 100644 drivers/rtc/rtc-lp8788.c
 delete mode 100644 drivers/rtc/rtc-rc5t583.c
 delete mode 100644 drivers/rtc/rtc-wm8350.c
 delete mode 100644 drivers/video/backlight/aat2870_bl.c
 delete mode 100644 drivers/video/backlight/adp5520_bl.c
 delete mode 100644 drivers/video/backlight/da903x_bl.c
 delete mode 100644 drivers/video/backlight/lm3533_bl.c
 delete mode 100644 drivers/video/backlight/lp8788_bl.c
 delete mode 100644 drivers/watchdog/rdc321x_wdt.c
 delete mode 100644 drivers/watchdog/wm8350_wdt.c
 delete mode 100644 include/linux/mfd/88pm80x.h
 delete mode 100644 include/linux/mfd/aat2870.h
 delete mode 100644 include/linux/mfd/adp5520.h
 delete mode 100644 include/linux/mfd/lm3533.h
 delete mode 100644 include/linux/mfd/lp8788-isink.h
 delete mode 100644 include/linux/mfd/lp8788.h
 delete mode 100644 include/linux/mfd/mcp.h
 delete mode 100644 include/linux/mfd/menelaus.h
 delete mode 100644 include/linux/mfd/rc5t583.h
 delete mode 100644 include/linux/mfd/rdc321x.h
 delete mode 100644 include/linux/mfd/si476x-core.h
 delete mode 100644 include/linux/mfd/si476x-platform.h
 delete mode 100644 include/linux/mfd/si476x-reports.h
 delete mode 100644 include/linux/mfd/ucb1x00.h
 delete mode 100644 include/linux/mfd/wm8350/audio.h
 delete mode 100644 include/linux/mfd/wm8350/comparator.h
 delete mode 100644 include/linux/mfd/wm8350/core.h
 delete mode 100644 include/linux/mfd/wm8350/gpio.h
 delete mode 100644 include/linux/mfd/wm8350/pmic.h
 delete mode 100644 include/linux/mfd/wm8350/rtc.h
 delete mode 100644 include/linux/mfd/wm8350/supply.h
 delete mode 100644 include/linux/mfd/wm8350/wdt.h
 delete mode 100644 include/linux/mfd/wm8400-audio.h
 delete mode 100644 include/linux/mfd/wm8400-private.h
 delete mode 100644 include/linux/mfd/wm8400.h
 delete mode 100644 include/linux/platform_data/mfd-mcp-sa11x0.h
 delete mode 100644 include/media/drv-intf/si476x.h
 delete mode 100644 sound/soc/codecs/si476x.c
 delete mode 100644 sound/soc/codecs/wm8350.c
 delete mode 100644 sound/soc/codecs/wm8350.h
 delete mode 100644 sound/soc/codecs/wm8400.c
 delete mode 100644 sound/soc/codecs/wm8400.h

-- 
2.53.0

Cc: Lee Jones <lee@kernel.org>
Cc: Daniel Thompson <danielt@kernel.org>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Linus Walleij <linusw@kernel.org>
Cc: Bartosz Golaszewski <brgl@kernel.org>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Pavel Machek <pavel@kernel.org>
Cc: Michael Hennerich <michael.hennerich@analog.com>
Cc: Support Opensource <support.opensource@diasemi.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Helge Deller <deller@gmx.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-media@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-hwmon@vger.kernel.org
Cc: patches@opensource.cirrus.com
Cc: linux-watchdog@vger.kernel.org
Cc: linux-gpio@vger.kernel.org
Cc: linux-iio@vger.kernel.org
Cc: linux-input@vger.kernel.org
Cc: linux-leds@vger.kernel.org
Cc: mfd@lists.linux.dev
Cc: linux-pm@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: linux-fbdev@vger.kernel.org
Cc: linux-sound@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: llvm@lists.linux.dev

On Wed, 9 Sep 2026 15:21:37 +0200, Arnd Bergmann <arnd@kernel.org> said:
> From: Arnd Bergmann <arnd@arndb.de>
>
> As part of my cleanup of old platforms, I had a look at all drivers that
> may have become unused because the last platform_data or DT definition
> was removed, or because of unmet Kconfig dependencies.
>
> These are all the mfd drivers I found. The first ten in the list
> actually turned out to have been unusable long before my series, and
> I have added explanations on how I determined this in each patch. The
> last four patches are still in use in linux-7.3 but become unused after
> my series [1] that I hope to get merged for 7.4.
>
> Somewhat unorthodox, I took a shortcut here and remove both the mfd drivers
> and the corresponding subsystem drivers (gpio, hwmon, iio, input, led,
> media, power, regulator, rtc, video, watchdog, asoc) in a combined patch,
> to simplify the interdependencies: removing just the mfd driver would
> leave unselectable or broken drivers in other subsystems.  I also have
> additional patches for each of the other subsystems, currently a total
> of 300 patches, many of which still need better testing or proper
> changelog texts.
>
> Please let me know if you all think this approach is ok, or if I should
> explode this further and turn these 14 patches into 70 individual ones
> by splitting them per subsystem.
>
> See [2] for the current state of the overall series.
>
>      Arnd
>
> [1] https://lore.kernel.org/lkml/20260908152808.3928630-1-arnd@kernel.org/
> [2] https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git/log/?h=board-remove-7.3
>
> Arnd Bergmann (14):
>   mfd: remove unused 88pm80x driver
>   mfd: remove unused rdc321x southbridge support
>   mfd: remove unused si476x driver
>   mfd: remove unused wm8400 driver
>   mfd: remove unused adp5520 driver
>   mfd: remove unused da903x driver
>   mfd: remove unused lp8788 driver
>   mfd: remove unused aat2870 driver
>   mfd: remove unused lm3533 driver
>   mfd: remove unused rc5t583 driver
>   mfd: remove unused wm8350 driver
>   mfd: remove unused mcp-sa11x0/ucb1x00 driver
>   mfd: remove unused menelaus driver
>   mfd: remove unused iPaq micro driver
>
>  .../ABI/testing/sysfs-class-backlight         |   11 -
>  Documentation/admin-guide/devices.txt         |    1 -
>  .../admin-guide/media/radio-cardlist.rst      |    1 -
>  Documentation/admin-guide/media/si476x.rst    |  160 --
>  .../admin-guide/media/v4l-drivers.rst         |    1 -
>  .../devicetree/bindings/regulator/88pm800.txt |   38 -
>  Documentation/hwmon/index.rst                 |    1 -
>  Documentation/hwmon/wm8350.rst                |   30 -
>  .../watchdog/watchdog-parameters.rst          |    7 -
>  MAINTAINERS                                   |   14 -
>  drivers/gpio/Kconfig                          |   22 -
>  drivers/gpio/Makefile                         |    3 -
>  drivers/gpio/gpio-adp5520.c                   |  169 --
>  drivers/gpio/gpio-rdc321x.c                   |  199 --
>  drivers/gpio/gpio-wm8350.c                    |  144 --

For GPIO:

Acked-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

On Wed, Sep 09, 2026 at 03:21:37PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> As part of my cleanup of old platforms, I had a look at all drivers that
> may have become unused because the last platform_data or DT definition
> was removed, or because of unmet Kconfig dependencies.
> 
> These are all the mfd drivers I found. The first ten in the list
> actually turned out to have been unusable long before my series, and
> I have added explanations on how I determined this in each patch. The
> last four patches are still in use in linux-7.3 but become unused after
> my series [1] that I hope to get merged for 7.4.
> 
> Somewhat unorthodox, I took a shortcut here and remove both the mfd drivers
> and the corresponding subsystem drivers (gpio, hwmon, iio, input, led,
> media, power, regulator, rtc, video, watchdog, asoc) in a combined patch,
> to simplify the interdependencies: removing just the mfd driver would
> leave unselectable or broken drivers in other subsystems.  I also have
> additional patches for each of the other subsystems, currently a total
> of 300 patches, many of which still need better testing or proper
> changelog texts.
> 
> Please let me know if you all think this approach is ok, or if I should
> explode this further and turn these 14 patches into 70 individual ones
> by splitting them per subsystem.

Sounds good to me, especially if Lee makes an immutable branch from this
pull so we can all pull it in...

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> # for input

Thanks.

-- 
Dmitry