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Re: [PATCH 07/20] regmap: Without bus read() or write(), force use_single_rw

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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@pengutronix.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@pengutronix.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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[PATCH 07/20] regmap: Without bus read() or write(), force use_single_rw Markus Pargmann <mpa@pengutronix.de> - 2015-08-12 12:20 +0200
  Re: [PATCH 07/20] regmap: Without bus read() or write(), force use_single_rw Daniel Kurtz <djkurtz@chromium.org> - 2015-08-12 12:40 +0200
    Re: [PATCH 07/20] regmap: Without bus read() or write(), force  use_single_rw Markus Pargmann <mpa@pengutronix.de> - 2015-08-12 12:50 +0200
  Re: [PATCH 07/20] regmap: Without bus read() or write(), force  use_single_rw Mark Brown <broonie@kernel.org> - 2015-08-12 13:20 +0200

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