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rust: pwm: Add module_pwm_platform_driver! macro

Rust PWM drivers using the abstractions in `kernel/pwm.rs` typically
call C functions (like `pwmchip_alloc`, `__pwmchip_add`, etc.) that are
exported to the `PWM` C symbol namespace.

With the introduction of `imports_ns` support in the `module!` macro,
every PWM driver would need to manually include `imports_ns: ["PWM"]` in
its module declaration.

To simplify this for driver authors and ensure consistency, introduce a
new helper macro `module_pwm_platform_driver!` in `pwm.rs`. This macro
wraps the standard `module_platform_driver!`, forwards all user provided
arguments using the `($($user_args:tt)*)` pattern, and automatically
injects the `imports_ns: ["PWM"]` declaration.

This follows the pattern used in other subsystems (e.g.,
`module_pci_driver!`) to provide specialized module registration
helpers. It makes writing PWM drivers slightly simpler and less error
prone regarding namespace imports.

Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com>
Reviewed-by: Elle Rhumsaa <elle@weathered-steel.dev>
Link: https://patch.msgid.link/20251028-pwm_fixes-v1-2-25a532d31998@samsung.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>

authored by

Michal Wilczynski and committed by
Uwe Kleine-König 264b501b d8046cd5

+23
+23
rust/kernel/pwm.rs
··· 760 760 unsafe { bindings::pwmchip_remove(chip_raw); } 761 761 } 762 762 } 763 + 764 + /// Declares a kernel module that exposes a single PWM driver. 765 + /// 766 + /// # Examples 767 + /// 768 + ///```ignore 769 + /// kernel::module_pwm_platform_driver! { 770 + /// type: MyDriver, 771 + /// name: "Module name", 772 + /// authors: ["Author name"], 773 + /// description: "Description", 774 + /// license: "GPL v2", 775 + /// } 776 + ///``` 777 + #[macro_export] 778 + macro_rules! module_pwm_platform_driver { 779 + ($($user_args:tt)*) => { 780 + $crate::module_platform_driver! { 781 + $($user_args)* 782 + imports_ns: ["PWM"], 783 + } 784 + }; 785 + }