linux-kernel - Re: [PATCH v2] clk: si570: Add a driver for SI570 oscillators

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Date:	Thu, 19 Sep 2013 14:11:12 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Sören Brinkmann <soren.brinkmann@...inx.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Mike Turquette <mturquette@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Hyun Kwon <hyunk@...inx.com>
Subject: Re: [PATCH v2] clk: si570: Add a driver for SI570 oscillators

On Thu, Sep 19, 2013 at 01:59:38PM -0700, Sören Brinkmann wrote:
> On Thu, Sep 19, 2013 at 09:44:38AM -0700, Guenter Roeck wrote:
> > On Thu, Sep 19, 2013 at 09:01:01AM -0700, Sören Brinkmann wrote:
> > > On Thu, Sep 19, 2013 at 06:17:12AM -0700, Guenter Roeck wrote:
> > > > On Wed, Sep 18, 2013 at 03:43:38PM -0700, Soren Brinkmann wrote:
> [...]
> > > > > +	if (of_property_read_bool(client->dev.of_node,
> > > > > +				"temperature-stability-7ppm"))
> > > > > +		data->div_offset = SI570_DIV_OFFSET_7PPM;
> > > > > +
> > > > Just noticed that you dropped platform data support. Doesn't matter much for me
> > > > right now, but in my previous company we used the chip on an x86 system which
> > > > does not support devicetree. Would be nice to keep it and derive platform data
> > > > from devicetree data if provided, like other drivers do it.
> > > I'll look into this. The issue I have with that is, I can hardly test it
> > > since we only use this on Zynq which uses DT. So, I'd rather prefer to
> > > not include it unless somebody volunteers to test it.
> > > 
> > Fair enough. I can not test it myself anymore, and my previous employer
> > now has a strict non-contributions-to-linux policy, so I guess they won't
> > test it either or at least not publish any test results. Leave it out.
> > 
> > > > The 7ppm option is only relevant for si570/si751 and not supported on
> > > > si598/si599. You should mention that in the bindings document and check for it.
> > > Right, I'll add a note in the doc. And ignore it for devices this does
> > > not apply.
> > > 
> > I would bail out, but that is your call.
> Correct me if I'm wrong, but in general drivers do not test for
> unsupported properties. So, in case we have one of the supported 59x
> device, we should not test whether a (unsupported) property is present,
> just to fail in that case, IMHO.
> 
Ok with me if that is the accepted way of handling this condition.

Guenter
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