linux-kernel - Re: [RFC 2/7] regmap: check for alignment on translated register addresses

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Date:   Fri, 24 Mar 2023 18:51:19 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>, rafael@...nel.org,
        Colin Foster <colin.foster@...advantage.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Lee Jones <lee@...nel.org>, davem@...emloft.net,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        thomas.petazzoni@...tlin.com
Subject: Re: [RFC 2/7] regmap: check for alignment on translated register
 addresses

On Fri, Mar 24, 2023 at 10:36:39AM +0100, Maxime Chevallier wrote:
> With regmap->reg_base and regmap->reg_downshift, the actual register
> address that is going to be used for the next operation might not be the
> same as the one we have as an input. Addresses can be offset with
> reg_base and shifted, which will affect alignment.
> 
> Check for alignment on the real register address.

It is not at all clear to me that the combination of stride and
downshift particularly makes sense, and especially not that the
stride should be applied after downshifting rather than to what
the user is passing in.

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