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

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Date:   Fri, 6 Jul 2018 10:49:15 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Enric Balletbo Serra <eballetbo@...il.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>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Sebastian Reichel <sre@...nel.org>, chenjh@...k-chips.com,
        Andrey Smirnov <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 Fri, Jul 06, 2018 at 08:05:59AM +0100, Lee Jones wrote:
> On Thu, 05 Jul 2018, Dmitry Torokhov wrote:
> 
> > On July 5, 2018 12:56:50 AM PDT, Matti Vaittinen <matti.vaittinen@...rohmeurope.com> wrote:
> > >On Wed, Jul 04, 2018 at 06:57:39PM +0200, Enric Balletbo Serra wrote:
> > >> Missatge de Dmitry Torokhov <dmitry.torokhov@...il.com> del dia dc.,
> > >4
> > >> de jul. 2018 a les 17:10:
> > >> >
> > >> > Hi Enric,
> > >> >
> > >> > On Tue, Jun 26, 2018 at 11:06:33AM +0200, Enric Balletbo Serra
> > >wrote:
> > >> > > > +static struct mfd_cell bd71837_mfd_cells[] = {
> > >> > > > +       {
> > >> > > > +               .name = "bd71837-clk",
> > >> > > > +       }, {
> > >> > > > +               .name = "bd718xx-pwrkey",
> > >> > > > +               .resources = &irqs[0],
> > >> > > > +               .num_resources = ARRAY_SIZE(irqs),
> > >> > > > +       }, {
> > >> > > > +               .name = "bd71837-pmic",
> > >> > > > +       },
> > >> > > nit: no comma at the end
> > >> >
> > >> > Actually, trailing comma is preferred on structures/arrays without
> > >> > sentinels, because if one needs to add a new entry/new member, then
> > >in
> > >> > the diff there will have only one new line added, instead of one
> > >line
> > >> > being changed (adding now necessary comma) and one added.
> > >> >
> > >> 
> > >> Many thanks for sharing your knowledge! That looks to me a good
> > >> reason.
> > >
> > >So in this specific ecample leaving the comma does not help. The
> > >opening
> > >brace for new array element would be added to same line where the comma
> > >is, right?
> > 
> > Ah, yes,  you are right. We usually have either:
> > 
> >         { /* element 1 */ },
> >         { / *element 2 */ },
> >         ...
> > 
> > or:
> > 
> >         {
> >                 /* element 1 */
> >         },
> >         {
> >                 /* element 2 */
> >         },
> > 
> > but I do not think that it is codified in the CodingStyle.
> 
> FWIW, my *strong* preference for single line entries in the
> aforementioned single line format.  Then Dmitry's explanation rings
> true.

The reasoning given by Dmitry makes perfect sense. And to my eyes:
	{
		/* element 1 */
	},
	{
		/* element 2 */
 	},

actually looks better than:
> 	{
		/* element 1 */
	}, {
		/* element 2 */
 	},

So if first one is not enforced in order to minimize almost empty lines
- then I will try to be using the latter in the future. (In such cases
  where element consists of more than one value).

Thanks for this little lesson =)

Br,
	Matti Vaittinen