Re: [PATCH 01/14] gpio: pca953x: move suspend/resume to suspend_noirq/resume_noirq

From: Thomas Richard <thomas.richard@bootlin.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Tony Lindgren" <tony@atomide.com>,
	"Bartosz Golaszewski" <brgl@bgdev.pl>,
	"Andy Shevchenko" <andy@kernel.org>,
	"Haojian Zhuang" <haojian.zhuang@linaro.org>,
	"Vignesh R" <vigneshr@ti.com>,
	"Aaro Koskinen" <aaro.koskinen@iki.fi>,
	"Janusz Krzysztofik" <jmkrzyszt@gmail.com>,
	"Andi Shyti" <andi.shyti@kernel.org>,
	"Peter Rosin" <peda@axentia.se>, "Vinod Koul" <vkoul@kernel.org>,
	"Kishon Vijay Abraham I" <kishon@kernel.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	"Tom Joseph" <tjoseph@cadence.com>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
	linux-i2c@vger.kernel.org, linux-phy@lists.infradead.org,
	linux-pci@vger.kernel.org, gregory.clement@bootlin.com,
	theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com,
	u-kumar1@ti.com
Subject: Re: [PATCH 01/14] gpio: pca953x: move suspend/resume to suspend_noirq/resume_noirq
Date: Fri, 9 Feb 2024 08:44:39 +0100	[thread overview]
Message-ID: <68d4a1bb-5b40-47fe-a117-647d77009b43@bootlin.com> (raw)
In-Reply-To: <CACRpkdY2wiw1zH8FsEv7S1FW044PBSXpLPqanF5yyH1R4oteEA@mail.gmail.com>

On 2/8/24 22:29, Linus Walleij wrote:
> On Thu, Feb 8, 2024 at 5:19 PM Thomas Richard
> <thomas.richard@bootlin.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

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