linux-kernel - RE: [PATCH v4 5/8] MFD: ti_am335x

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Date:	Wed, 6 Feb 2013 11:17:23 +0000
From:	"Patil, Rachna" <rachna@...com>
To:	Koen Kooi <koen@...inion.thruhere.net>
CC:	Russell King <linux@....linux.org.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	Dmitry Torokhov <dtor@...l.ru>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"Hebbar, Gururaja" <gururaja.hebbar@...com>,
	Jonathan Cameron <jic23@....ac.uk>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v4 5/8] MFD: ti_am335x_tscadc: Add DT support

Hi Koen,

> <SNIP>
> > > > Since AM335x is DT only, why is there a platform data codepath and why is it the first branch it tries? And I guess the next question is related to the first: why doesn't it work when used with DT? When I copy over the nodes from the evm.dts to my board I get "tsc tsc: Missing platform data" in dmesg.
> > > 
> > > This IP came up 1st on AM335x, but it is not platform dependent. The driver can be used on other platforms where-in DT is not supported.
> > > According to the maintainers platform data takes precedence over DT. Hence the order.
> > > 
> > 
> > Rachana,
> > 
> > I see no point adding support for platform_data when you know that none of older platforms are going to use this driver and all future platforms _must_ follow device-tree model.
> > 
> > So I agree that you should remove board file dependency from the driver.
> 
> Ok. I will remove support for platform data in the next version of patches.
> 
> > 
> > 
> > > I do not see "Missing platform data" error msg in the latest driver. I am not able to trace from where this got populated.
> > > 
> > 
> > Can you share the branch which you have tested?
> 
> https://github.com/patilrachna/linux/tree/v3.8_rc3_MFD_TSCADC_DT-v2

Did you get a chance to test this branch?
And can you also share your branch, on which you observed the issue.

Regards,
Rachna

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