linux-kernel - Re: [PATCH 4/6] regulator: Add operation to let drivers select vsel register

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Message-ID: <Y+v31bkMWxPEVqrT@sirena.org.uk>
Date:   Tue, 14 Feb 2023 21:06:29 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Frieder Schrempf <frieder@...s.de>
Cc:     Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org,
        Marek Vasut <marex@...x.de>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [PATCH 4/6] regulator: Add operation to let drivers select vsel
 register

On Mon, Feb 13, 2023 at 04:58:22PM +0100, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> There are regulators that use multiple registers for storing the
> voltage. Add a get_reg_voltage_sel member to struct regulator_ops in
> order to let drivers register a function that returns the currently
> used register.
> 
> The pca9450 driver will be a user of this as the LDO5 regulator of
> that chip uses two different control registers depending on the
> state of an external signal.

Aside from the build warnings the bots reported it's not clear to
me that it's better to do this than it is to just have these
drivers implement appropriate ops directly - there's probably
going to be cases when it's a different bitfield in the same
register, and by the time you've implemented the op so things
aren't completely data driven I'm not sure how much you win by
reusing the register read/write.

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