From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcus Lorentzon Subject: Re: Multiple parents in device driver model and Common Display Framework (CDF) Date: Tue, 12 Feb 2013 23:20:04 +0100 Message-ID: References: <511A5A15.4000306@stericsson.com> <20130212220209.GA23856@kroah.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1465289265==" Return-path: Received: from mail-ia0-f169.google.com (mail-ia0-f169.google.com [209.85.210.169]) by gabe.freedesktop.org (Postfix) with ESMTP id A020BE5C6C for ; Tue, 12 Feb 2013 14:20:05 -0800 (PST) Received: by mail-ia0-f169.google.com with SMTP id j5so576004iaf.0 for ; Tue, 12 Feb 2013 14:20:04 -0800 (PST) In-Reply-To: <20130212220209.GA23856@kroah.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Greg KH Cc: arnd@arndb.de, Daniel Vetter , dri-devel@lists.freedesktop.org, Tomi Valkeinen , Laurent Pinchart List-Id: dri-devel@lists.freedesktop.org --===============1465289265== Content-Type: multipart/alternative; boundary=f46d042fdeb26c3c5704d58e6d62 --f46d042fdeb26c3c5704d58e6d62 Content-Type: text/plain; charset=ISO-8859-1 Den 12 feb 2013 23:02 skrev "Greg KH" : > > On Tue, Feb 12, 2013 at 04:04:53PM +0100, Marcus Lorentzon wrote: > > 3) Daniel V hinted that multiple parents (or multiple busses) is > > something that has been discussed as a limitation of device driver > > model before. And that maybe now was the time to fix that or at > > least sort out how to handle it. > > No, it's the other way around, we have discussed ways about having > multiple drivers control a single device at the same time. The > "multiple parents" issue has come up a number of times with the power > management people, but they solved this by keeping a separate tree of > how to properly control and walk things to handle power domains and the > like. > Thanks, does this mean there are no other devices in the kernel that sit on multiple busses that can be use as inspiration? Was the discussion about handling one device from multiple drivers concluded/implemented? It sounds very much what we are trying to do? Or this was just some f2f discussion? BR Marcus Mobile --f46d042fdeb26c3c5704d58e6d62 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Den 12 feb 2013 23:02 skrev "Greg KH" <gregkh@linuxfoundation.org>:<= br> >
> On Tue, Feb 12, 2013 at 04:04:53PM +0100, Marcus Lorentzon wrote:
> > 3) Daniel V hinted that multiple parents (or multiple busses) is<= br> > > something that has been discussed as a limitation of device drive= r
> > model before. And that maybe now was the time to fix that or at > > least sort out how to handle it.
>
> No, it's the other way around, we have discussed ways about having=
> multiple drivers control a single device at the same time. =A0The
> "multiple parents" issue has come up a number of times with = the power
> management people, but they solved this by keeping a separate tree of<= br> > how to properly control and walk things to handle power domains and th= e
> like.
>
Thanks,
does this mean there are no other devices in the kernel that sit on multipl= e busses that can be use as inspiration?
Was the discussion about handling one device from multiple drivers conclude= d/implemented? It sounds very much what we are trying to do? Or this was ju= st some f2f discussion?

BR
Marcus Mobile

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