linux-kernel - Re: [PATCH 10/13] tty: serial: omap: remove some dead code

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Message-ID: <20140423230121.GC10924@saruman.home>
Date:	Wed, 23 Apr 2014 18:01:21 -0500
From:	Felipe Balbi <balbi@...com>
To:	NeilBrown <neilb@...e.de>
CC:	Nishanth Menon <nm@...com>, Felipe Balbi <balbi@...com>,
	Greg KH <gregkh@...uxfoundation.org>, <marcel@...tmann.org>,
	<gustavo@...ovan.org>, <johan.hedberg@...il.com>, <jslaby@...e.cz>,
	<grant.likely@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<linux-bluetooth@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH 10/13] tty: serial: omap: remove some dead code

Hi,

On Thu, Apr 24, 2014 at 08:43:05AM +1000, NeilBrown wrote:
> On Wed, 23 Apr 2014 10:35:04 -0500 Nishanth Menon <nm@...com> wrote:
> 
> > On 04/23/2014 09:58 AM, Felipe Balbi wrote:
> > > nobody passes a DTR_gpio to this driver, so
> > > this code is not necessary.
> > > 
> > > Signed-off-by: Felipe Balbi <balbi@...com>
> > > ---
> > 
> > Niel,
> > this seems to revert the functionality introduced in
> > commit 9574f36fb801035f6ab0fbb1b53ce2c12c17d100
> > (OMAP/serial: Add support for driving a GPIO as DTR.)
> > 
> > would you like to Ack this change?
> 
> I have a couple of out-of-tree drivers that use this support.
> 
> I hope to get back to working on that code one day and even get those drivers
> upstream.  So I would really prefer this code to remain if it isn't causing
> any actual problems.

it causes problem with DT (not really). That suport is only available on
legacy platform_data-based boot, it's not available on DT. I hear Tony
is pretty close to turning OMAP3 DT-only.

> Of course, I can always re-submit it when I need it again, but that it just
> extra work all around.

I wonder how you will pass those attributes through DT considering they
are *really* SW configuration. Why can't you use the real DTR pin, btw ?

-- 
balbi

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