linux-kernel - Re: [PATCH 01/14] gpio: pca953x: move suspend/resume to suspend_noirq/resume

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Date: Fri, 9 Feb 2024 08:44:39 +0100
From: Thomas Richard <thomas.richard@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Tony Lindgren <tony@...mide.com>, Bartosz Golaszewski <brgl@...ev.pl>,
 Andy Shevchenko <andy@...nel.org>, Haojian Zhuang
 <haojian.zhuang@...aro.org>, Vignesh R <vigneshr@...com>,
 Aaro Koskinen <aaro.koskinen@....fi>,
 Janusz Krzysztofik <jmkrzyszt@...il.com>, Andi Shyti
 <andi.shyti@...nel.org>, Peter Rosin <peda@...ntia.se>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, Tom Joseph <tjoseph@...ence.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
 linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-phy@...ts.infradead.org,
 linux-pci@...r.kernel.org, gregory.clement@...tlin.com,
 theo.lebrun@...tlin.com, thomas.petazzoni@...tlin.com, u-kumar1@...com
Subject: Re: [PATCH 01/14] gpio: pca953x: move suspend/resume to
 suspend_noirq/resume_noirq

On 2/8/24 22:29, Linus Walleij wrote:
> On Thu, Feb 8, 2024 at 5:19 PM Thomas Richard
> <thomas.richard@...tlin.com> wrote:
>> On 1/28/24 01:12, Linus Walleij wrote:
> 
>>> I guess you could define both pca953x_suspend() and
>>> pca953x_suspend_noirq() and selectively bail out on one
>>> path on some systems?
>>
>> Yes.
>>
>> What do you think if I use a property like for example "ti,pm-noirq" to
>> select the right path ?
>> Is a property relevant for this use case ?
> 
> That's a Linux-specific property and that's useless for other operating
> systems and not normally allowed. PM noirq is just some Linux thing.
> 
> *FIRST* we should check if putting the callbacks to noirq is fine with
> other systems too, and I don't see why not. Perhaps we need to even
> merge it if we don't get any test results.
> 
> If it doesn't work we can think of other options.

I think all systems using a i2c controller which uses autosuspend should
be impacted.
I guess a patch (like I did in this series for i2c-omap [1]) should be
applied for all i2c controller which use autosuspend.

[1]
https://lore.kernel.org/all/hqnxyffdsiqz5t43bexcqrwmynpjubxbzjchjaagxecso75dc7@y7lznovxg3go/

Regards,

-- 
Thomas Richard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com