Merge tag 'pwm/for-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

Pull pwm updates from Uwe Kleine-König:
 "This contains the usual mix of fixes, cleanups, two new drivers and
  several dt binding updates. The fixes are for minor issues that are
  already old (4.11-rc1 and 3.9-rc1) and were found by code review and
  not during usage, so I didn't sent them for earlier inclusion.

  The changes to include/linux/mfd/stm32-timers.h and
  drivers/counter/stm32-timer-cnt.c are part of an immutable branch that
  will also be included in the mfd and counter pulls. It changes some
  register definitions and affects the pwm-stm32 driver.

  Thanks go to Andy Shevchenko, AngeloGioacchino Del Regno, Conor
  Dooley, David Lechner, Dhruva Gole, Drew Fustini, Frank Li, Jeff
  Johnson, Junyi Zhao, Kelvin Zhang, Krzysztof Kozlowski, Lee Jones,
  Linus Walleij, Linus Walleij, Michael Hennerich, Nicola Di Lieto,
  Nicolas Ferre, Nuno Sa, Paul Cercueil, Raag Jadav, Rob Herring, Sean
  Anderson, Sean Young, Shenwei Wang, Stefan Wahren, Trevor Gamblin,
  Tzung-Bi Shih, Vincent Whitchurch and William Breathitt Gray for their
  contributions to this pull request; they authored changes, spend time
  reviewing changes and coordinated the above mentioned immutable
  branch"

* tag 'pwm/for-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: (38 commits)
  pwm: axi-pwmgen: add .max_register to regmap
  dt-bindings: pwm: at91: Add sama7d65 compatible string
  pwm: atmel-tcb: Make private data variable naming consistent
  pwm: atmel-tcb: Simplify checking the companion output
  pwm: Allow pwm state transitions from an invalid state
  pwm: xilinx: Simplify using devm_ functions
  pwm: Use guards for pwm_lookup_lock instead of explicity mutex_lock + mutex_unlock
  pwm: Use guards for export->lock instead of explicity mutex_lock + mutex_unlock
  pwm: Use guards for pwm_lock instead of explicity mutex_lock + mutex_unlock
  pwm: Register debugfs operations after the pwm class
  pwm: imx-tpm: Enable pinctrl setting for sleep state
  pwm: lpss: drop redundant runtime PM handles
  pwm: lpss: use devm_pm_runtime_enable() helper
  pwm-stm32: Make use of parametrised register definitions
  dt-bindings: pwm: imx: remove interrupt property from required
  pwm: meson: Add support for Amlogic S4 PWM
  pwm: Add GPIO PWM driver
  dt-bindings: pwm: Add pwm-gpio
  pwm: Drop pwm_apply_state()
  bus: ts-nbus: Use pwm_apply_might_sleep()
  ...

1 files changed, 6 insertions, 1 deletions

diff --git a/Documentation/driver-api/gpio/drivers-on-gpio.rst b/Documentation/driver-api/gpio/drivers-on-gpio.rst
index af632d764ac6..95572d2a94ce 100644
--- a/Documentation/driver-api/gpio/drivers-on-gpio.rst
+++ b/Documentation/driver-api/gpio/drivers-on-gpio.rst
@@ -27,7 +27,12 @@ hardware descriptions such as device tree or ACPI:
   to the lines for a more permanent solution of this type.
 
 - gpio-beeper: drivers/input/misc/gpio-beeper.c is used to provide a beep from
-  an external speaker connected to a GPIO line.
+  an external speaker connected to a GPIO line. (If the beep is controlled by
+  off/on, for an actual PWM waveform, see pwm-gpio below.)
+
+- pwm-gpio: drivers/pwm/pwm-gpio.c is used to toggle a GPIO with a high
+  resolution timer producing a PWM waveform on the GPIO line, as well as
+  Linux high resolution timers can do.
 
 - extcon-gpio: drivers/extcon/extcon-gpio.c is used when you need to read an
   external connector status, such as a headset line for an audio driver or an