linux-kernel - Re: [RFC PATCH v2 2/3] regmap: mmio: allow reset control in a MMIO regmap

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Message-ID: <Y5MvOp7kLoEJfwkk@sirena.org.uk>
Date:   Fri, 9 Dec 2022 12:51:06 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jeremy Kerr <jk@...econstruct.com.au>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [RFC PATCH v2 2/3] regmap: mmio: allow reset control in a MMIO
 regmap

On Fri, Dec 09, 2022 at 09:33:08AM +0800, Jeremy Kerr wrote:
> A syscon device may need to be taken out of reset before functioning -
> this change adds a facility to attach a reset control to a mmio regmap,
> and performs the necessary deassert/assert operations on the reset
> controller on attach/detach.

Managment of reset feels like something that should be done at a higher
level - typically reset also implies losing all the register contents
which means it should be somewhere above the cache layer.

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