[PATCH] pwm: th1520: fix `CLIPPY=1` warning

[Uwe Kleine-König]

Hello Miguel,

On Wed, Jan 21, 2026 at 07:37:19PM +0100, Miguel Ojeda wrote:
> The Rust kernel code should be kept `CLIPPY=1`-clean [1].
> 
> Clippy reports:
> 
>     error: this pattern reimplements `Option::unwrap_or`
>       --> drivers/pwm/pwm_th1520.rs:64:5
>        |
>     64 | /     (match ns.checked_mul(rate_hz) {
>     65 | |         Some(product) => product,
>     66 | |         None => u64::MAX,
>     67 | |     }) / NSEC_PER_SEC_U64
>        | |______^ help: replace with: `ns.checked_mul(rate_hz).unwrap_or(u64::MAX)`
>        |
>        = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#manual_unwrap_or
>        = note: `-D clippy::manual-unwrap-or` implied by `-D warnings`
>        = help: to override `-D warnings` add `#[allow(clippy::manual_unwrap_or)]`
> 
> Applying the suggestion then triggers:
> 
>     error: manual saturating arithmetic
>       --> drivers/pwm/pwm_th1520.rs:64:5
>        |
>     64 |     ns.checked_mul(rate_hz).unwrap_or(u64::MAX) / NSEC_PER_SEC_U64
>        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `saturating_mul`: `ns.saturating_mul(rate_hz)`
>        |
>        = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#manual_saturating_arithmetic
>        = note: `-D clippy::manual-saturating-arithmetic` implied by `-D warnings`
>        = help: to override `-D warnings` add `#[allow(clippy::manual_saturating_arithmetic)]`
> 
> Thus fix it by using saturating arithmatic, which simplifies the code
> as well.
> 
> Link: https://rust-for-linux.com/contributing#submit-checklist-addendum [1]
> Fixes: e03724aac758 ("pwm: Add Rust driver for T-HEAD TH1520 SoC")
> Signed-off-by: Miguel Ojeda <ojeda at kernel.org>
> ---

Looks good to me. I'll wait for Michal to add his blessing and then when
picking it up tend to drop the Fixes line. Or do we also care about
CLIPPY-cleanness in stable?

Best regards
Uwe
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