linux-kernel - Re: [PATCH 1/2] dt-bindings: gpio: add binding doc for siflower,sf19a2890-gpio

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Message-ID: <CACRpkdYi_+aQ5L-c4=w9MK-6Uh0e9dX0nnU6LcZcHd90j97q7w@mail.gmail.com>
Date: Mon, 13 Jan 2025 15:38:33 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Chuanhong Guo <gch981213@...il.com>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: Re: [PATCH 1/2] dt-bindings: gpio: add binding doc for siflower,sf19a2890-gpio

On Sun, Dec 29, 2024 at 4:06 AM Chuanhong Guo <gch981213@...il.com> wrote:

> I don't know how one reset could be shared across multiple platform
> devices so I don't think this kind of split is possible.

In general I don't think shared reset lines in silicon is
any problem whatsoever, they are reference counted,
just like clocks or regulators, and there is a flag
RESET_CONTROL_FLAGS_BIT_SHARED
especially for this purpose.

You might have to fix the reset driver, or fix up the way
they are defined in the device tree, I don't know how,
but certainly it is possible. If in doubt consult the reset
controller maintainer. (Philipp.)

Yours,
Linus Walleij