linux-kernel - Re: [PATCH v2 0/7] Rust Abstractions for PWM subsystem with TH1520 PWM driver

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Message-ID: <t26bhukukjzy7e4d2omtvjchxxzlnfyx54ku7xbytcnxkuk7xk@6tap2t3z2oaq>
Date: Thu, 12 Jun 2025 07:01:57 +0200
From: Uwe Kleine-König <ukleinek@...nel.org>
To: Drew Fustini <drew@...7.com>
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>, 
	Danilo Krummrich <dakr@...nel.org>, 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>, 
	Stephen Boyd <sboyd@...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, 
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 0/7] Rust Abstractions for PWM subsystem with TH1520
 PWM driver

Hello Drew,

On Wed, Jun 11, 2025 at 04:52:22PM -0700, Drew Fustini wrote:
> I also enabled the pwm fan driver. However, there is a probe failure:
> 
> [    1.250921] pwm-fan pwm-fan: Failed to configure PWM: -524
> [    1.256546] pwm-fan pwm-fan: probe with driver pwm-fan failed with error -524

524 = ENOTSUPP, so it seems the request had duty_offset > 0. Does your
fan use PWM_POLARITY_INVERTED? If so, try without that flag. If your fan
really needs an inverted PWM this of course makes fan control buggy.
With the next revision it should work fine (as a duty_offset > 0 should
get rounded down to 0).

Best regards
Uwe

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