linux-stable.git/drivers/video/backlight, branch v6.8

Merge tag 'backlight-next-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight

2024-01-19T00:53:35+00:00

Pull backlight updates from Lee Jones:
 "New Drivers:
   - Add support for Monolithic Power Systems MP3309C WLED Step-up Converter

  Fix-ups:
   - Use/convert to new/better APIs/helpers/MACROs instead of
     hand-rolling implementations
   - Device Tree Binding updates
   - Demote non-kerneldoc header comments
   - Improve error handling; return proper error values, simplify, avoid
     duplicates, etc
   - Convert over to the new (kinda) GPIOD API

  Bug Fixes:
   - Fix uninitialised local variable"

* tag 'backlight-next-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
  backlight: hx8357: Convert to agnostic GPIO API
  backlight: ili922x: Add an error code check in ili922x_write()
  backlight: ili922x: Drop kernel-doc for local macros
  backlight: mp3309c: Fix uninitialized local variable
  backlight: pwm_bl: Use dev_err_probe
  backlight: mp3309c: Add support for MPS MP3309C
  dt-bindings: backlight: mp3309c: Remove two required properties

Merge tag 'pwm/for-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

2024-01-12T22:59:50+00:00

Pull pwm updates from Thierry Reding:
 "This contains a bunch of cleanups and simplifications across the
  board, as well as a number of small fixes.

  Perhaps the most notable change here is the addition of an API that
  allows PWMs to be used in atomic contexts, which is useful when time-
  critical operations are involved, such as using a PWM to generate IR
  signals.

  Finally, I have decided to step down as PWM subsystem maintainer. Due
  to other responsibilities I have lately not been able to find the time
  that the subsystem deserves and Uwe, who has been helping out a lot
  for the past few years and has many things planned for the future, has
  kindly volunteered to take over. I have no doubt that he will be a
  suitable replacement"

* tag 'pwm/for-6.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (44 commits)
  MAINTAINERS: pwm: Thierry steps down, Uwe takes over
  pwm: linux/pwm.h: fix Excess kernel-doc description warning
  pwm: Add pwm_apply_state() compatibility stub
  pwm: cros-ec: Drop documentation for dropped struct member
  pwm: Drop two unused API functions
  pwm: lpc18xx-sct: Don't modify the cached period of other PWM outputs
  pwm: meson: Simplify using dev_err_probe()
  pwm: stmpe: Silence duplicate error messages
  pwm: Reduce number of pointer dereferences in pwm_device_request()
  pwm: crc: Use consistent variable naming for driver data
  pwm: omap-dmtimer: Drop locking
  dt-bindings: pwm: ti,pwm-omap-dmtimer: Update binding for yaml
  media: pwm-ir-tx: Trigger edges from hrtimer interrupt context
  pwm: bcm2835: Allow PWM driver to be used in atomic context
  pwm: Make it possible to apply PWM changes in atomic context
  pwm: renesas: Remove unused include
  pwm: Replace ENOTSUPP with EOPNOTSUPP
  pwm: Rename pwm_apply_state() to pwm_apply_might_sleep()
  pwm: Stop referencing pwm->chip
  pwm: Update kernel doc for struct pwm_chip
  ...

fbdev: Remove support for Carillo Ranch driver

2024-01-12T11:38:37+00:00

As far as anybody can tell, this product never shipped.  If it did,
it shipped in 2007 and nobody has access to one any more.  Remove the
fbdev driver and the backlight driver.

Signed-off-by: Matthew Wilcox (Oracle) 
Signed-off-by: Helge Deller

pwm: Rename pwm_apply_state() to pwm_apply_might_sleep()

2023-12-20T15:07:04+00:00

In order to introduce a pwm api which can be used from atomic context,
we will need two functions for applying pwm changes:

	int pwm_apply_might_sleep(struct pwm *, struct pwm_state *);
	int pwm_apply_atomic(struct pwm *, struct pwm_state *);

This commit just deals with renaming pwm_apply_state(), a following
commit will introduce the pwm_apply_atomic() function.

Acked-by: Uwe Kleine-König 
Acked-by: Guenter Roeck 
Acked-by: Mark Brown 
Acked-by: Dmitry Torokhov  # for input
Acked-by: Hans de Goede 
Acked-by: Jani Nikula 
Acked-by: Lee Jones 
Signed-off-by: Sean Young 
Signed-off-by: Thierry Reding

backlight: hx8357: Convert to agnostic GPIO API

2023-12-13T15:41:59+00:00

The of_gpio.h is going to be removed. In preparation of that convert
the driver to the agnostic API.

Fixes: fbbbcd177a27 ("gpiolib: of: add quirk for locating reset lines with legacy bindings")
Signed-off-by: Andy Shevchenko 
Reviewed-by: Daniel Thompson 
Reviewed-by: Linus Walleij 
Link: https://lore.kernel.org/r/20231207161513.3195509-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Lee Jones

backlight: ili922x: Add an error code check in ili922x_write()

2023-12-07T15:54:55+00:00

Clang static analyzer complains that value stored to 'ret' is never read.
Return the error code when spi_sync() failed.

Signed-off-by: Su Hui 
Reviewed-by: Daniel Thompson 
Link: https://lore.kernel.org/r/20231130051155.1235972-1-suhui@nfschina.com
Signed-off-by: Lee Jones

backlight: ili922x: Drop kernel-doc for local macros

2023-12-07T13:28:20+00:00

Don't use kernel-doc notation for the local macros START_BYTE() and
CHECK_FREQ_REG(). This prevents these kernel-doc warnings:

ili922x.c:85: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 * START_BYTE(id, rs, rw)
ili922x.c:85: warning: missing initial short description on line:
 * START_BYTE(id, rs, rw)
ili922x.c:118: warning: expecting prototype for CHECK_FREQ_REG(spi_device s, spi_transfer x)(). Prototype was for CHECK_FREQ_REG() instead

Signed-off-by: Randy Dunlap 
Reviewed-by: Daniel Thompson 
Link: https://lore.kernel.org/r/20231206174525.14960-1-rdunlap@infradead.org
Signed-off-by: Lee Jones

backlight: mp3309c: Fix uninitialized local variable

2023-12-01T11:24:21+00:00

In the function "pm3309c_parse_dt_node", when the dimming analog control
mode (by I2C messages) is enabled, the local variable "prop_levels" is
tested without any initialization, as indicated by the following smatch
warning:

drivers/video/backlight/mp3309c.c:279 pm3309c_parse_dt_node() error: uninitialized symbol 'prop_levels'.

To avoid any problem in case of undefined behavior, we need to initialize
it to "NULL".

Reported-by: Dan Carpenter 
Closes: https://lore.kernel.org/dri-devel/af0a1870-693b-442f-9b11-0503cfcd944a@moroto.mountain/
Fixes: 2e914516a58c ("backlight: mp3309c: Add support for MPS MP3309C")
Signed-off-by: Flavio Suligoi 
Reviewed-by: Daniel Thompson 
Link: https://lore.kernel.org/r/20231129164514.2772719-1-f.suligoi@asem.it
Signed-off-by: Lee Jones

backlight: pwm_bl: Use dev_err_probe

2023-11-23T15:37:05+00:00

Use dev_err_probe to simplify error paths. Also let dev_err_probe handle
the -EPROBE_DEFER case and add an entry to
/sys/kernel/debug/devices_deferred when deferred.

Signed-off-by: Alexander Stein 
Reviewed-by: Uwe Kleine-König 
Reviewed-by: Daniel Thompson 
Link: https://lore.kernel.org/r/20231117120625.2398417-1-alexander.stein@ew.tq-group.com
Signed-off-by: Lee Jones

backlight: mp3309c: Add support for MPS MP3309C

2023-11-23T14:54:32+00:00

The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a
programmable switching frequency to optimize efficiency.
The brightness can be controlled either by I2C commands (called "analog"
mode) or by a PWM input signal (PWM mode).
This driver supports both modes.

For DT configuration details, please refer to:
- Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml

The datasheet is available at:
- https://www.monolithicpower.com/en/mp3309c.html

Signed-off-by: Flavio Suligoi 
Reviewed-by: Daniel Thompson 
Link: https://lore.kernel.org/r/20231116105319.957600-3-f.suligoi@asem.it
Signed-off-by: Lee Jones