linux-kernel - Re: [PATCH v8 08/12] regulator: bd718x7: Split driver to common and bd718x7 specific parts

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Message-ID: <20200113105301.GF5414@dell>
Date:   Mon, 13 Jan 2020 10:53:01 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     "Vaittinen, Matti" <Matti.Vaittinen@...rohmeurope.com>
Cc:     "linux-leds@...r.kernel.org" <linux-leds@...r.kernel.org>,
        "dmurphy@...com" <dmurphy@...com>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "mazziesaccount@...il.com" <mazziesaccount@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "jacek.anaszewski@...il.com" <jacek.anaszewski@...il.com>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "bgolaszewski@...libre.com" <bgolaszewski@...libre.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "pavel@....cz" <pavel@....cz>,
        "broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH v8 08/12] regulator: bd718x7: Split driver to common and
 bd718x7 specific parts

On Wed, 08 Jan 2020, Vaittinen, Matti wrote:

> Hello Lee,
> 
> On Tue, 2020-01-07 at 12:41 +0000, Lee Jones wrote:
> > On Mon, 30 Dec 2019, Matti Vaittinen wrote:
> > 
> > > Few ROHM PMICs allow setting the voltage states for different
> > > system states
> > > like RUN, IDLE, SUSPEND and LPSR. States are then changed via SoC
> > > specific
> > > mechanisms. bd718x7 driver implemented device-tree parsing
> > > functions for
> > > these state specific voltages. The parsing functions can be re-used 
> > > by
> > > other ROHM chip drivers like bd71828. Split the generic functions
> > > from
> > > bd718x7-regulator.c to rohm-regulator.c and export them for other
> > > modules
> > > to use.
> > > 
> > > Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> > > Acked-by: Mark Brown <broonie@...nel.org>
> > > ---

[...]

> > > +#if IS_ENABLED(CONFIG_REGULATOR_ROHM)
> > > +int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config
> > > *dvs,
> > > +				  struct device_node *np,
> > > +				  const struct regulator_desc *desc,
> > > +				  struct regmap *regmap);
> > 
> > Does these really need to live in the parent's header file?
> 
> I don't know what would be a better place?

You don't have a regulator header file?

It seems over-kill to create one for this, so leave it as is.

> > What other call-sites are there?
> 
> After this series the bd718x7-regulator.c and bd71828-regulator.c are
> the in-tree drivers using these. rohm-regulator.c is implementing them.
> And I hope we see yet another driver landing in later this year. 
> 
> Anyways, I will investigate if I can switch this to some common (not
> rohm specific) DT bindings at some point (I've scheduled this study to
> March) - If I can then they should live in regulator core headers.
> 
> But changing the existing properties should again be own set of patches
> and I'd prefer doing that work independently of this series and not
> delaying the BD71828 due to not-yet-evaluated bd718x7 property changes.

That's fine.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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