linux-kernel - Re: [PATCH V3 1/2] tps6507x-ts: Add DT support

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Message-ID: <CAKDJKT500ewMEv-f-vZBkMELkFkNBXLrv0oS_qUivbq0T-Y6yA@mail.gmail.com>
Date:	Mon, 29 Jul 2013 11:47:21 +0530
From:	Manish Badarkhe <badarkhe.manish@...il.com>
To:	"Vishwanathrao Badarkhe, Manish" <manishv.b@...com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"rob@...dley.net" <rob@...dley.net>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>
Subject: Re: [PATCH V3 1/2] tps6507x-ts: Add DT support

Hi Dmitry

On Mon, Jul 1, 2013 at 4:40 PM, Manish Badarkhe
<badarkhe.manish@...il.com> wrote:
>
> Hi Dmitry
>
>
> On Wed, Jun 12, 2013 at 12:23 PM, Vishwanathrao Badarkhe, Manish
> <manishv.b@...com> wrote:
> > Hi Dmitry,
> >
> > On Mon, Jun 10, 2013 at 23:33:11, Dmitry Torokhov wrote:
> >> Manish,
> >>
> >> On Mon, Jun 10, 2013 at 10:23:16AM +0000, Vishwanathrao Badarkhe,
> >> Manish wrote:
> >> > Hi Dmitry,
> >> >
> >> > On Mon, Jun 10, 2013 at 11:34:42, Dmitry Torokhov wrote:
> >> > > Hi Manish,
> >> > >
> >> > > On Tue, May 21, 2013 at 02:24:17PM +0530, Vishwanathrao Badarkhe,
> >> > > Manish wrote:
> >> > >
> >> > > > +       struct touchscreen_init_data *init_data = NULL;
> >> > > > +       int err;
> >> > > > +
> >> > > > +       if (node)
> >> > > > +               node = of_find_node_by_name(node, "tsc");
> >> > >
> >> > > Why do you have to locate OF node manually instead of already
> >> > > having it attached to the device stucture?
> >> >
> >> > As TPS6507x is mfd device containing two nodes, regulator and
> >> > touchscreen.
> >> > It is necessary to use "of_find_node_by_name" to find child "tsc"
> >> > node
> >> > of TPS6507x MFD device.
> >>
> >> I understand that TPS6507x is a MFD device, However, I still do not
> >> understand why you do not attach OF data to the child platform device
> >> representing touch screen when you create it.
> >
> > I gone through most of MFD devices in mainline kernel where
> > "of_find_node_by_name"
> > function is used in order to populate child node properties.
> > See below example of max8925 MFD device.
> >
> > Max8025 MFD device has following modules
> > 1. Touch screen
> > 2. Charger
> > 3. Backlight
> > 4. regulator
> >
> > In DT case, device node for max8925 MFD device is in
> > "arch/arm/boot/dts/mmp2-brownstone.dts"
> > file having child nodes as regulator, backlight and charger.
> > Respective drivers (regulator, backlight and charger) of max8925 MFD
> > device used
> > "of_find_node_by_name" function in order to populate child node
> > properties.
> >
> > Here, also same case for TPS6507x MFD device
> >
> > TPS6507x MFD device has two childs:
> > 1. regulator
> > 2. touch screen.
> >
> > Regulator driver for TPS6507x is already in mainline and using function
> > "of_find_node_by_name" to populate device tree properties for
> > regulators.
> > On similar lines I used "of_find_node_by_name" to populate device
> > tree properties for touch screen.
> >
> > Still, I agreed that it is possible to attach OF data to child platform
> > device
> > but it requires changes in MFD driver of TPS6507x.
> >
> > Please let me know your opinion about this.
>
> Please let me know so accordingly I will make changes in code.
>

Please provide your comments so accordingly will make changes in code.

Regards
Manish Badarkhe
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