linux-kernel - Re: [PATCH v7 3/8] rust: pwm: Add core 'Device' and 'Chip' object wrappers

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Message-ID: <hdc4gweo5orxjzfggelvddpmhesmzkav2w3il7asewg5lswrxh@rslvwmzofedu>
Date: Thu, 3 Jul 2025 08:42:08 +0200
From: Uwe Kleine-König <ukleinek@...nel.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Michal Wilczynski <m.wilczynski@...sung.com>, 
	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>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, Guo Ren <guoren@...nel.org>, 
	Fu Wei <wefu@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
	Marek Szyprowski <m.szyprowski@...sung.com>, Benno Lossin <lossin@...nel.org>, 
	Michael Turquette <mturquette@...libre.com>, Drew Fustini <fustini@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-pwm@...r.kernel.org, rust-for-linux@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	devicetree@...r.kernel.org
Subject: Re: [PATCH v7 3/8] rust: pwm: Add core 'Device' and 'Chip' object
 wrappers

Hello Danilo,

On Wed, Jul 02, 2025 at 05:13:34PM +0200, Danilo Krummrich wrote:
> I assume the C API does guarantee that a struct pwm_device *always* holds a
> valid pointer to a struct pwm_chip?

Yes, a pwm_device holds a reference to the chip's dev. So until pwm_put
is called the chip won't go away.

Best regards
Uwe


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