linux-stable.git/drivers/pwm, branch v5.4.2

pwm: bcm-iproc: Prevent unloading the driver module while in use

2019-11-08T17:38:06+00:00

The owner member of struct pwm_ops must be set to THIS_MODULE to
increase the reference count of the module such that the module cannot
be removed while its code is in use.

Fixes: daa5abc41c80 ("pwm: Add support for Broadcom iProc PWM controller")
Signed-off-by: Uwe Kleine-König 
Reviewed-by: Florian Fainelli 
Signed-off-by: Thierry Reding

Revert "pwm: Let pwm_get_state() return the last implemented state"

2019-10-21T14:48:52+00:00

It turns out that commit 01ccf903edd6 ("pwm: Let pwm_get_state() return
the last implemented state") causes backlight failures on a number of
boards. The reason is that some of the drivers do not write the full
state through to the hardware registers, which means that ->get_state()
subsequently does not return the correct state. Consumers which rely on
pwm_get_state() returning the current state will therefore get confused
and subsequently try to program a bad state.

Before this change can be made, existing drivers need to be more
carefully audited and fixed to behave as the framework expects. Until
then, keep the original behaviour of returning the software state that
was applied rather than reading the state back from hardware.

Reviewed-by: Uwe Kleine-König 
Tested-by: Enric Balletbo i Serra 
Tested-by: Michal Vokáč 
Signed-off-by: Thierry Reding

Merge tag 'pwm/for-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

2019-09-27T19:19:47+00:00

Pull pwm updates from Thierry Reding:
 "Besides one new driver being added for the PWM controller found in
  various Spreadtrum SoCs, this series of changes brings a slew of,
  mostly minor, fixes and cleanups for existing drivers, as well as some
  enhancements to the core code.

  Lastly, Uwe is added to the PWM subsystem entry of the MAINTAINERS
  file, making official his role as a reviewer"

* tag 'pwm/for-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (34 commits)
  MAINTAINERS: Add myself as reviewer for the PWM subsystem
  MAINTAINERS: Add patchwork link for PWM entry
  MAINTAINERS: Add a selection of PWM related keywords to the PWM entry
  pwm: mediatek: Add MT7629 compatible string
  dt-bindings: pwm: Update bindings for MT7629 SoC
  pwm: mediatek: Update license and switch to SPDX tag
  pwm: mediatek: Use pwm_mediatek as common prefix
  pwm: mediatek: Allocate the clks array dynamically
  pwm: mediatek: Remove the has_clks field
  pwm: mediatek: Drop the check for of_device_get_match_data()
  pwm: atmel: Consolidate driver data initialization
  pwm: atmel: Remove unneeded check for match data
  pwm: atmel: Remove platform_device_id and use only dt bindings
  pwm: stm32-lp: Add check in case requested period cannot be achieved
  pwm: Ensure pwm_apply_state() doesn't modify the state argument
  pwm: fsl-ftm: Don't update the state for the caller of pwm_apply_state()
  pwm: sun4i: Don't update the state for the caller of pwm_apply_state()
  pwm: rockchip: Don't update the state for the caller of pwm_apply_state()
  pwm: Let pwm_get_state() return the last implemented state
  pwm: Introduce local struct pwm_chip in pwm_apply_state()
  ...

pwm: mediatek: Add MT7629 compatible string

2019-09-26T11:27:50+00:00

This adds pwm support for MT7629, and separate mt7629 compatible string
from mt7622

Signed-off-by: Sam Shih 
Signed-off-by: Thierry Reding

pwm: mediatek: Update license and switch to SPDX tag

2019-09-25T07:49:15+00:00

Add SPDX identifiers to pwm-mediatek.c. Update MODULE_LICENSE to
correctly reflect the GNU General Public License v2.0.

Signed-off-by: Ryder Lee 
Signed-off-by: Sam Shih 
Reviewed-by: Uwe Kleine-König 
Signed-off-by: Thierry Reding

pwm: mediatek: Use pwm_mediatek as common prefix

2019-09-25T07:49:15+00:00

Use pwm_mediatek as common prefix to match the filename. No functional
change intended.

Signed-off-by: Ryder Lee 
Signed-off-by: Sam Shih 
Acked-by: Uwe Kleine-König 
Signed-off-by: Thierry Reding

pwm: mediatek: Allocate the clks array dynamically

2019-09-25T07:49:15+00:00

Instead of using fixed size of arrays, allocate the memory for them
based on the number of PWMs specified for each SoC generation.

Signed-off-by: Ryder Lee 
Signed-off-by: Sam Shih 
Reviewed-by: Uwe Kleine-König 
Signed-off-by: Thierry Reding

pwm: mediatek: Remove the has_clks field

2019-09-25T07:48:58+00:00

We can use fixed clocks to repair mt7628 PWM during configure from
userspace. The SoC is legacy MIPS and has no complex clock tree. Because
we can get the clock frequency for period calculation from fixed clocks
specified in DT, we can remove the has_clock field, and directly use
devm_clk_get() and clk_get_rate().

Signed-off-by: Ryder Lee 
Signed-off-by: Sam Shih 
Acked-by: Uwe Kleine-König 
Signed-off-by: Thierry Reding

pwm: mediatek: Drop the check for of_device_get_match_data()

2019-09-21T01:25:11+00:00

This patch drop the check for of_device_get_match_data. Due to the only
way call driver probe is compatible match. The data pointer which points
to the SoC specify data is directly set by driver, and it should not be
NULL in our case. We can safety remove the check for the result of
of_device_get_match_data().

Signed-off-by: Ryder Lee 
Signed-off-by: Sam Shih 
Acked-by: Uwe Kleine-König 
Signed-off-by: Thierry Reding

pwm: atmel: Consolidate driver data initialization

2019-09-21T01:25:11+00:00

This helps readability by separating the driver-specific bits from the
PWM framework bits.

Signed-off-by: Thierry Reding