linux-kernel - Re: [PATCH v7 1/4] mfd: bd71837: mfd driver for ROHM BD71837 PMIC

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Date:   Tue, 3 Jul 2018 07:53:29 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Enric Balletbo Serra <eballetbo@...il.com>
Cc:     matti.vaittinen@...rohmeurope.com,
        Michael Turquette <mturquette@...libre.com>, sboyd@...nel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, mazziesaccount@...il.com,
        Arnd Bergmann <arnd@...db.de>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sebastian Reichel <sre@...nel.org>, chenjh@...k-chips.com,
        andrew.smirnov@...il.com, Linus Walleij <linus.walleij@...aro.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Heiko Stübner <heiko@...ech.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-clk@...r.kernel.org,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-input@...r.kernel.org, mikko.mutanen@...rohmeurope.com,
        heikki.haikola@...rohmeurope.com
Subject: Re: [PATCH v7 1/4] mfd: bd71837: mfd driver for ROHM BD71837 PMIC

On Tue, 26 Jun 2018, Enric Balletbo Serra wrote:

> Hi Matti,
> Missatge de Matti Vaittinen <matti.vaittinen@...rohmeurope.com> del
> dia dt., 26 de juny 2018 a les 13:25:
> >
> > Hello Eric,
> >
> > Thanks for the comments! I'll be addressing these in patch series v8
> > - except the regmap wrapper one which will be taken care of by another
> > patch set.
> >
> > On Tue, Jun 26, 2018 at 11:06:33AM +0200, Enric Balletbo Serra wrote:
> > > Hi Matti,
> > >
> > > Thanks for the patch, a few comments below, some are feedback I
> > > received when I sent some patches to this subsystem.
> > >
> > > Missatge de Matti Vaittinen <matti.vaittinen@...rohmeurope.com> del
> > > dia dt., 19 de juny 2018 a les 12:57:
> > > >
> > > > ROHM BD71837 PMIC MFD driver providing interrupts and support
> > > > for two subsystems:
> > > > - clk
> > > > - Regulators
> > > >
> > > > Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> > > > ---
> > > >  drivers/mfd/Kconfig         |  13 ++
> > > >  drivers/mfd/Makefile        |   1 +
> > > >  drivers/mfd/bd71837.c       | 221 ++++++++++++++++++++++++++
> > > >  include/linux/mfd/bd71837.h | 367 ++++++++++++++++++++++++++++++++++++++++++++
> > > >  4 files changed, 602 insertions(+)
> > > >  create mode 100644 drivers/mfd/bd71837.c
> > > >  create mode 100644 include/linux/mfd/bd71837.h

[...]

> > > > +static const struct of_device_id bd71837_of_match[] = {
> > > > +       { .compatible = "rohm,bd71837", .data = (void *)0},
> > > > +       { },
> > >
> > > nit: { /* sentinel */ }
> >
> > I am sorry but I didn't quite get the point here. Could you please
> > explain what did you expect to be added here?
> >
> 
> It's a nit but It is a good practice to specify that the last entry is
> a sentinel. Just this.
> 
> +static const struct of_device_id bd71837_of_match[] = {
> +       { .compatible = "rohm,bd71837", .data = (void *)0},
> +       { /* sentinel */ }
> +};

I would not say this is "good practice" at all.

We all know what empty brackets mean.  No need for obvious comments.

When authors put this, I let it go because "sentinel" is a cool word -
and nothing more! ;)

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