Merge tag 'pwm/for-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

Pull pwm updates from Uwe Kleine-König:
 "In addition to the usual mix of core cleanups, driver changes, minor
  fixes and device tree updates the highlight this cycle is Rust support
  for the core and a first Rust driver both provided by Michal
  Wilczynski.

  Michal wrote about these changes on

    https://mwilczynski.dev/posts/bringing-rust-to-the-pwm-subsystem/

  which is a nice read"

* tag 'pwm/for-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux: (22 commits)
  pwm: rzg2l-gpt: Allow checking period_tick cache value only if sibling channel is enabled
  pwm: bcm2835: Make sure the channel is enabled after pwm_request()
  pwm: mediatek: Make use of struct_size macro
  pwm: mediatek: Remove unneeded semicolon
  pwm: airoha: Add support for EN7581 SoC
  pwm: mediatek: Convert to waveform API
  pwm: max7360: Clean MAX7360 code
  pwm: Drop unused function pwm_apply_args()
  pwm: Use %u to printf unsigned int pwm_chip::npwm and pwm_chip::id
  pwm: Simplify printf to emit chip->npwm in $debugfs/pwm
  pwm: th1520: Use module_pwm_platform_driver! macro
  pwm: th1520: Fix clippy warning for redundant struct field init
  pwm: Fix Rust formatting
  dt-bindings: pwm: thead: Add T-HEAD TH1520 PWM controller
  pwm: Add Rust driver for T-HEAD TH1520 SoC
  rust: pwm: Fix broken intra-doc link
  rust: pwm: Drop wrapping of PWM polarity and state
  rust: pwm: Add module_pwm_platform_driver! macro
  rust: pwm: Add complete abstraction layer
  rust: pwm: Add Kconfig and basic data structures
  ...

1 files changed, 6 insertions, 33 deletions

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 549ac4aaad59..b11ae91723f8 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -488,6 +488,12 @@ int __pwmchip_add(struct pwm_chip *chip, struct module *owner);
 #define pwmchip_add(chip) __pwmchip_add(chip, THIS_MODULE)
 void pwmchip_remove(struct pwm_chip *chip);
 
+/*
+ * For FFI wrapper use only:
+ * The Rust PWM abstraction needs this to properly free the pwm_chip.
+ */
+void pwmchip_release(struct device *dev);
+
 int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct module *owner);
 #define devm_pwmchip_add(dev, chip) __devm_pwmchip_add(dev, chip, THIS_MODULE)
 
@@ -611,39 +617,6 @@ devm_fwnode_pwm_get(struct device *dev, struct fwnode_handle *fwnode,
 }
 #endif
 
-static inline void pwm_apply_args(struct pwm_device *pwm)
-{
-	struct pwm_state state = { };
-
-	/*
-	 * PWM users calling pwm_apply_args() expect to have a fresh config
-	 * where the polarity and period are set according to pwm_args info.
-	 * The problem is, polarity can only be changed when the PWM is
-	 * disabled.
-	 *
-	 * PWM drivers supporting hardware readout may declare the PWM device
-	 * as enabled, and prevent polarity setting, which changes from the
-	 * existing behavior, where all PWM devices are declared as disabled
-	 * at startup (even if they are actually enabled), thus authorizing
-	 * polarity setting.
-	 *
-	 * To fulfill this requirement, we apply a new state which disables
-	 * the PWM device and set the reference period and polarity config.
-	 *
-	 * Note that PWM users requiring a smooth handover between the
-	 * bootloader and the kernel (like critical regulators controlled by
-	 * PWM devices) will have to switch to the atomic API and avoid calling
-	 * pwm_apply_args().
-	 */
-
-	state.enabled = false;
-	state.polarity = pwm->args.polarity;
-	state.period = pwm->args.period;
-	state.usage_power = false;
-
-	pwm_apply_might_sleep(pwm, &state);
-}
-
 struct pwm_lookup {
 	struct list_head list;
 	const char *provider;