linux-kernel - Re: [PATCH v2 2/2] rust: clk: use the type-state pattern

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Message-Id: <93C70872-E3E5-4CF2-9CB2-56353C26FDA0@collabora.com>
Date: Sat, 20 Sep 2025 12:35:52 +0200
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>,
 Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>,
 Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <lossin@...nel.org>,
 Andreas Hindborg <a.hindborg@...nel.org>,
 Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>,
 Danilo Krummrich <dakr@...nel.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-clk@...r.kernel.org,
 rust-for-linux@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] rust: clk: use the type-state pattern

Hi everyone, gentle ping for reviewing this patch :)

> On 10 Sep 2025, at 19:28, Daniel Almeida <daniel.almeida@...labora.com> wrote:
> 
> The current Clk abstraction can still be improved on the following issues:
> 
> a) It only keeps track of a count to clk_get(), which means that users have
> to manually call disable() and unprepare(), or a variation of those, like
> disable_unprepare().
> 
> b) It allows repeated calls to prepare() or enable(), but it keeps no track
> of how often these were called, i.e., it's currently legal to write the
> following:
> 
> clk.prepare();
> clk.prepare();
> clk.enable();
> clk.enable();
> 
> And nothing gets undone on drop().

^ this really sucks so we should probably take in this change.

— Daniel