linux-kernel - Re: [PATCH 10/40] soc/tegra: pmc: Implement pad configuration via pinctrl

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Date:   Thu, 9 Aug 2018 15:12:11 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Aapo Vienamo <avienamo@...dia.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        Stefan Agner <stefan@...er.ch>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org
Subject: Re: [PATCH 10/40] soc/tegra: pmc: Implement pad configuration via
 pinctrl

On Thu, Aug 09, 2018 at 03:44:12PM +0300, Aapo Vienamo wrote:
> On Thu, 9 Aug 2018 14:27:06 +0200
> Thierry Reding <thierry.reding@...il.com> wrote:
> 
> > On Wed, Aug 01, 2018 at 07:32:00PM +0300, Aapo Vienamo wrote:
> > > Register a pinctrl device and implement get and set functions for
> > > PIN_CONFIG_LOW_POWER_MODE and PIN_CONFIG_POWER_SOURCE parameters.
> > > 
> > > Signed-off-by: Aapo Vienamo <avienamo@...dia.com>
> > > Acked-by: Jon Hunter <jonathanh@...dia.com>
> > > ---
> > >  drivers/soc/tegra/pmc.c | 187 +++++++++++++++++++++++++++++++++++++++++++++++-
> > >  1 file changed, 185 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c  
> > [...]
> > > @@ -1704,6 +1863,12 @@ static const u8 tegra124_cpu_powergates[] = {
> > >  		.name	= (_name),			\
> > >  	})
> > >  
> > > +#define TEGRA_IO_PIN_DESC(_id, _dpd, _voltage, _name)	\
> > > +	((struct pinctrl_pin_desc) {			\
> > > +		.number = (_id),			\
> > > +		.name	= (_name)			\
> > > +	})
> > > +  
> > 
> > Do we really need the explicit cast to struct pinctrl_pin_desc here?
> > 
> 
> No, but I prefer to have it as it makes the type of the value the macro
> expands to explicit. In a way it hints at how and where the macro should
> be used and arguably improves readability.

It's a rather uncommon pattern in the kernel, and most issues are easily
caught by the compiler.

But it's fine with me if you want to keep it.

Thierry

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