linux-kernel - Re: [PATCH 07/20] regmap: Without bus read() or write(), force use_single

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Message-ID: <20150812104545.GB19600@pengutronix.de>
Date:	Wed, 12 Aug 2015 12:45:45 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	linux-iio@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Sasha Hauer <kernel@...gutronix.de>,
	Henry Chen <henryc.chen@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	linux-mediatek@...ts.infradead.org,
	Kevin Hilman <khilman@...nel.org>
Subject: Re: [PATCH 07/20] regmap: Without bus read() or write(), force
 use_single_rw

Hi,

On Wed, Aug 12, 2015 at 06:33:55PM +0800, Daniel Kurtz wrote:
> Hi Markus,
> 
> On Wed, Aug 12, 2015 at 6:12 PM, Markus Pargmann <mpa@...gutronix.de> wrote:
> >
> > The implementation of regmap bus read() and write() methods are
> > optional. Therefore we have to handle busses which do not have these
> > functions. If raw read() and write() is not supported we have to use
> > reg_read and reg_write always.
> >
> > This patch sets use_single_rw if read() or write() is not set.
> >
> > Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
> > ---
> >  drivers/base/regmap/regmap.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
> > index f98bd5bf5c62..35ad3783da70 100644
> > --- a/drivers/base/regmap/regmap.c
> > +++ b/drivers/base/regmap/regmap.c
> > @@ -573,7 +573,7 @@ struct regmap *regmap_init(struct device *dev,
> >                 map->reg_stride = config->reg_stride;
> >         else
> >                 map->reg_stride = 1;
> > -       map->use_single_rw = config->use_single_rw;
> > +       map->use_single_rw = config->use_single_rw || !bus->read || !bus->write;
> 
> What if bus is NULL?

Yes thanks, that has to be checked.

Best Regards,

Markus

> 
> -Dan
> 
> >         map->can_multi_write = config->can_multi_write;
> >         map->dev = dev;
> >         map->bus = bus;
> > --
> > 2.4.6
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > Please read the FAQ at  http://www.tux.org/lkml/
> 

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