[PATCH v3] net/smsc911x: add device tree probe support

[Shawn Guo]

On Fri, Sep 09, 2011 at 09:50:30AM +0100, Dave Martin wrote:
> On Thu, Sep 08, 2011 at 11:29:20AM -0700, Grant Likely wrote:
> > On Thu, Sep 08, 2011 at 03:59:46PM +0100, Dave Martin wrote:
> > > Hi Shawn,
> > > 
> > > On Sun, Jul 31, 2011 at 02:26:00AM +0800, Shawn Guo wrote:
> > > > It adds device tree probe support for smsc911x driver.
> > > > 
> > > > Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> > > > Cc: Grant Likely <grant.likely at secretlab.ca>
> > > > Cc: Steve Glendinning <steve.glendinning at smsc.com>
> > > > Cc: David S. Miller <davem at davemloft.net>
> > > > Reviewed-by: Grant Likely <grant.likely at secretlab.ca>
> > > > ---
> > > > Changes since v2:
> > > >  * Fix a typo in smsc911x.txt
> > > > 
> > > > Changes since v1:
> > > >  * Instead of getting irq line from gpio number, it use irq domain
> > > >    to keep platform_get_resource(IORESOURCE_IRQ) works for dt too.
> > > >  * Use 'lan9115' the first model that smsc911x supports in the match
> > > >    table
> > > >  * Use reg-shift and reg-io-width which already used in of_serial for
> > > >    shift and access size binding
> > > 
> > > When using this patch with vexpress, I found that 16-bit register access
> > > mode doesn't seem to be getting set correctly.
> > > 
> > > Can you take a look at this additional patch and let me know if it looks
> > > correct?
> > > 
> > > Cheers
> > > ---Dave
> > > 
> > > From: Dave Martin <dave.martin at linaro.org>
> > > Date: Wed, 7 Sep 2011 17:26:31 +0100
> > > Subject: [PATCH] net/smsc911x: Correctly configure 16-bit register access from DT
> > > 
> > > The SMSC911X_USE_16BIT needs to be set when using 16-bit register
> > > access.  However, currently no flag is set if the DT doesn't specify
> > > 32-bit access.
> > > 
> > > This patch should set the SMSC911X_USE_16BIT flag in a manner consistent
> > > with the documented DT bindings.
> > > 
> > > Signed-off-by: Dave Martin <dave.martin at linaro.org>
> > > ---
> > >  drivers/net/smsc911x.c |    2 ++
> > >  1 files changed, 2 insertions(+), 0 deletions(-)
> > > 
> > > diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
> > > index 75c08a5..1a35c25 100644
> > > --- a/drivers/net/smsc911x.c
> > > +++ b/drivers/net/smsc911x.c
> > > @@ -2121,6 +2121,8 @@ static int __devinit smsc911x_probe_config_dt(
> > >  	of_property_read_u32(np, "reg-io-width", &width);
> > >  	if (width == 4)
> > >  		config->flags |= SMSC911X_USE_32BIT;
> > > +	else
> > > +		config->flags |= SMSC911X_USE_16BIT;
> > 
> > Would it be better to do "else if (width == 2)"?  (completely
> > uninformed comment.  I've not looked at what the non-DT probe path
> > does on this driver.)
> 
> I wouldn't have a problem with that.  But currently the binding
> documentation says that any value other than 4, or a missing property,
> implies 16-bit register access.
> 
> So the binding documentation would need to change too in that case.
> 
> Personally I think this would be better, but it's just an opinion.
> 
Yes.  SMSC911X_USE_32BIT and SMSC911X_USE_16BIT are the only two cases
supported by the driver.

-- 
Regards,
Shawn