netdev - Re: [PATCH] dp83640: Get gpio and master/slave configuration from DT

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Message-ID: <20140210153901.GH29080@e106331-lin.cambridge.arm.com>
Date:	Mon, 10 Feb 2014 15:39:01 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Stefan Sørensen <stefan.sorensen@...ctralink.com>
Cc:	"richardcochran@...il.com" <richardcochran@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] dp83640: Get gpio and master/slave configuration from
 DT

On Mon, Feb 10, 2014 at 03:25:15PM +0000, Stefan Sørensen wrote:
> On Mon, 2014-02-10 at 13:42 +0000, Mark Rutland wrote:
> 
> > Binding document please.
> 
> Dang, I somehow managed to drop that from the patch. I will fix for the
> next version.

Cheers.

> 
> > > +	if (of_find_property(node, "dp83640,slave", NULL))
> > > +		dp83640->slave = true;
> > 
> > Use of_property_read_bool.
> 
> Fixed.
> 
> > > +	prop = of_find_property(node, "dp83640,perout-gpios", &proplen);
> > > +	if (prop) {
> > > +		if (dp83640->slave) {
> > > +			pr_err("dp83640,perout-gpios property can not be set together with dp83640,slave");
> > > +			return -EINVAL;
> > > +		}
> > > +
> > > +		clock->caps.n_per_out = proplen / sizeof(u32);
> > > +		if (clock->caps.n_per_out > N_EXT) {
> > > +			pr_err("dp83640,perout-gpios may not have more than %d entries",
> > > +			       N_EXT);
> > > +			return -EINVAL;
> > > +		}
> > > +		err = of_property_read_u32_array(node, "dp83640,perout-gpios",
> > > +						 clock->perout_gpios,
> > > +						 clock->caps.n_per_out);
> > > +		if (err < 0)
> > > +			return err;
> > > +	}
> > 
> > This looks nothing like the standard gpio bindings. What _exactly_ is
> > this property describing?
> 
> The dp83640 has a number of pins of which 8 of them can be used for
> either timestamping events or triggering changes at programmed
> intervals. These properties are used to configure which pins get
> assigned to what function.

Ok.

> 
> > If this is not using the standard gpio bindings then this should be
> > renamed.
> 
> Maybe a gpio->pin renaming?

That sounds good to me.

Thanks,
Mark.
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