linux-kernel - Re: [PATCH 1/9] dt-bindings: pwm: marvell,pxa: add optional property resets

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Message-ID: <3dfc300f-081c-4824-97c3-842f72d2a7d3@riscstar.com>
Date: Wed, 16 Apr 2025 06:33:42 -0500
From: Alex Elder <elder@...cstar.com>
To: Uwe Kleine-König <ukleinek@...nel.org>,
 Yixun Lan <dlan@...too.org>
Cc: Guodong Xu <guodong@...cstar.com>, Philipp Zabel
 <p.zabel@...gutronix.de>, Conor Dooley <conor@...nel.org>, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr, drew@...7.com,
 inochiama@...il.com, geert+renesas@...der.be, heylenay@....org,
 tglx@...utronix.de, hal.feng@...rfivetech.com, unicorn_wang@...look.com,
 duje.mihanovic@...le.hr, linux-pwm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev
Subject: Re: [PATCH 1/9] dt-bindings: pwm: marvell,pxa: add optional property
 resets

On 4/16/25 12:18 AM, Uwe Kleine-König wrote:
> Hello,
> 
> On Tue, Apr 15, 2025 at 12:28:07PM +0000, Yixun Lan wrote:
>> maybe there are cases that users don't want to issue a reset..
>> so, want to make it optional.. I can think one example that,
>> display controller is up and working from bootloader to linux,
>> reset it will got a flicker picture..
> 
> Agreed. You can just deassert the reset at probe time. That shouldn't
> interfere with a PWM that is already producing an output.

I think you're saying reset can be a required property, to be
harmlessly deasserted at probe time?  Yixun was suggesting it
should not be required, because it might already be deasserted.

Anyway, I don't feel strongly either way.  Maybe the DTS
maintainers can recommend what to do.

					-Alex

> 
>> GPG Key ID AABEFD55
> 
> If you advertise your OpenPGP certificate, I recommend using the long
> id. See for example https://keys.openpgp.org/search?q=AABEFD55.