linux-kernel - Re: [PATCH v2 25/30] gpio: nomadik: grab optional reset control and deassert it at probe

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Message-ID: <CACRpkdZE-hZGPg-1cnFZ_amYT6t3p=fOpvEOcsaZY3E-Y7_Weg@mail.gmail.com>
Date: Thu, 29 Feb 2024 10:38:52 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mips@...r.kernel.org, Gregory CLEMENT <gregory.clement@...tlin.com>, 
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH v2 25/30] gpio: nomadik: grab optional reset control and
 deassert it at probe

On Wed, Feb 28, 2024 at 12:28 PM Théo Lebrun <theo.lebrun@...tlin.com> wrote:

> Fetch a reference to the optional shared reset control and deassert it
> if it exists.
>
> Optional because not all platforms that use this driver have a reset
> attached to the reset block. Shared because some platforms that use the
> reset (at least Mobileye EyeQ5) share the reset across banks.
>
> Do not keep a reference to the reset control as it is not needed
> afterwards; the driver does not handle suspend, does not use runtime
> PM, does not register a remove callback and does not support unbinding
> from sysfs (made explicit with suppress_bind_attrs).
>
> The operation is done in nmk_gpio_populate_chip(). This function is
> called by either gpio-nomadik or pinctrl-nomadik, whoever comes first.
> This is here for historic reasons and could probably be removed now; it
> seems gpio-ranges enforces the ordering to be pinctrl-first. It is not
> the topic of the present patch however.
>
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>

Patch applied!

Yours,
Linus Walleij