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From: Mark Brown <broonie@kernel.org>
To: Jan Kara <jack@suse.cz>
Cc: ksummit-discuss@lists.linuxfoundation.org,
	Mauro Carvalho Chehab <mchehab@osg.samsung.com>,
	"vegard.nossum@gmail.com" <vegard.nossum@gmail.com>,
	"rafael.j.wysocki" <rafael.j.wysocki@intel.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Valentin Rothberg <valentinrothberg@gmail.com>
Subject: Re: [Ksummit-discuss] [TECH TOPIC] Addressing complex dependencies and semantics (v2)
Date: Thu, 28 Jul 2016 16:16:13 +0100	[thread overview]
Message-ID: <20160728151613.GF11806@sirena.org.uk> (raw)
In-Reply-To: <20160728114624.GE4094@quack2.suse.cz>

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On Thu, Jul 28, 2016 at 01:46:24PM +0200, Jan Kara wrote:

> So I'm complete outsider to media drivers so maybe my question is stupid
> but I cannot resist: So how is the device bringup supposed to work for
> devices where you have these cycles in the dependency graph? Do you just
> bring up the controller and then the sensor and it works because the
> controller doesn't need the clock from the sensor for startup?

For audio you don't tend to actually bring the device up and start fully
using it until it's needed to perform some task and when you do that
there usually is some definite procedure that works at a more granualar
level than the full devices.  In order to enumerate everything for the
Linux device model you want to know about all the dependencies and
ideally verify that they'll be there when you need them but you don't
actually need to use them at that point.

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  reply	other threads:[~2016-07-28 15:24 UTC|newest]

Thread overview: 111+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-27 16:50 [Ksummit-discuss] [TECH TOPIC] Addressing complex dependencies and semantics (v2) Luis R. Rodriguez
2016-07-27 17:26 ` Mark Brown
2016-07-27 17:58   ` Luis R. Rodriguez
2016-07-27 18:03     ` Mark Brown
2016-07-27 19:20       ` Luis R. Rodriguez
2016-07-28  0:54         ` Rafael J. Wysocki
2016-07-28 10:41           ` Laurent Pinchart
2016-07-28 10:54             ` Hans Verkuil
2016-07-28 11:03               ` Laurent Pinchart
2016-07-28 11:46                 ` Jan Kara
2016-07-28 15:16                   ` Mark Brown [this message]
2016-07-28 16:00                   ` Laurent Pinchart
2016-08-02  8:32                     ` Jan Kara
2016-08-03 14:17                     ` Alexandre Belloni
2016-07-30  1:59                   ` Steven Rostedt
2016-08-01 13:12                     ` Laurent Pinchart
2016-07-28 20:12                 ` Lars-Peter Clausen
2016-07-28 20:38                   ` Mark Brown
2016-08-01 13:15                   ` Laurent Pinchart
2016-07-28 14:36               ` Rafael J. Wysocki
2016-07-29  7:33             ` Hans Verkuil
2016-08-01 13:03               ` Laurent Pinchart
2016-08-01 13:17                 ` Hans Verkuil
2016-08-04  8:22             ` Jani Nikula
2016-08-04  9:50               ` Greg KH
2016-08-04 10:20                 ` Mark Brown
2016-08-04 10:27                   ` Jani Nikula
2016-08-05  2:59                   ` Rob Herring
2016-08-05  9:01                     ` Arnd Bergmann
2016-08-05 10:54                       ` Greg KH
2016-08-05 11:31                         ` Andrzej Hajda
2016-08-05 11:58                           ` Mark Brown
2016-08-05 13:43                           ` Greg KH
2016-08-05 19:27                         ` Rob Herring
2016-08-09  8:08                 ` Daniel Vetter
2016-08-09  8:17                   ` Greg KH
2016-08-09 12:04                     ` Daniel Vetter
2016-08-04 12:37       ` Geert Uytterhoeven
2016-08-04 15:53         ` Mark Brown
2016-07-28 21:49     ` Lars-Peter Clausen
2016-07-29  3:50       ` Greg KH
2016-07-29  7:45       ` Hans Verkuil
2016-07-29  7:55         ` Lars-Peter Clausen
2016-08-01 13:06           ` Laurent Pinchart
2016-07-29 11:13         ` Mark Brown
2016-08-01 13:09           ` Laurent Pinchart
2016-08-01 13:14             ` Lars-Peter Clausen
2016-08-01 13:19               ` Laurent Pinchart
2016-08-01 13:21             ` Hans Verkuil
2016-08-01 13:26               ` Laurent Pinchart
2016-08-01 13:35                 ` Hans Verkuil
2016-08-01 13:38                   ` Laurent Pinchart
2016-08-01 13:51                     ` Hans Verkuil
2016-08-01 17:15                       ` Laurent Pinchart
2016-08-01 13:33               ` Lars-Peter Clausen
2016-08-01 13:55                 ` Mauro Carvalho Chehab
2016-08-01 14:41                   ` Lars-Peter Clausen
2016-08-01 14:44                   ` Andrzej Hajda
2016-08-01 14:54                     ` Lars-Peter Clausen
2016-08-01 15:20                       ` Mark Brown
2016-08-01 15:34                       ` Andrzej Hajda
2016-08-01 15:43                         ` Lars-Peter Clausen
2016-08-01 16:18                           ` Andrzej Hajda
2016-08-01 17:06                             ` Mark Brown
2016-08-01 18:21                               ` Lars-Peter Clausen
2016-08-02 11:45                                 ` Andrzej Hajda
2016-08-01 18:33                               ` Andrzej Hajda
2016-08-01 18:48                                 ` Mark Brown
2016-08-01 19:42                                   ` Andrzej Hajda
2016-08-01 20:05                                     ` Lars-Peter Clausen
2016-08-02  8:57                                       ` Takashi Iwai
2016-08-01 17:40                       ` Laurent Pinchart
2016-08-02  7:38                     ` Greg KH
2016-08-01 19:03           ` Luis R. Rodriguez
2016-08-02  0:01             ` Rafael J. Wysocki
2016-08-02  0:56               ` Luis R. Rodriguez
2016-08-02  1:03                 ` Dmitry Torokhov
2016-08-02  8:30                   ` Jiri Kosina
2016-08-02  9:41                 ` Hannes Reinecke
2016-08-02  9:48                   ` Jiri Kosina
2016-08-02 11:50                     ` Takashi Iwai
2016-08-09  9:57             ` Jörg Rödel
2016-08-09 16:08               ` James Bottomley
2016-08-09 16:11                 ` James Bottomley
2016-08-09 16:51                   ` Luis R. Rodriguez
2016-08-09 17:05                     ` David Woodhouse
2016-08-09 17:12                     ` James Bottomley
2016-08-09 16:53                   ` Jörg Rödel
2016-08-09 18:06               ` Luis R. Rodriguez
2016-08-10 15:21                 ` Jörg Rödel
2016-08-10 16:42                   ` Luis R. Rodriguez
2016-08-10 21:37                     ` Jörg Rödel
2016-08-12  7:33               ` Linus Walleij
2016-07-27 18:50 ` Dmitry Torokhov
2016-07-28 10:43 ` Marc Zyngier
2016-07-28 10:51 ` Laurent Pinchart
2016-07-28 23:43   ` Luis R. Rodriguez
2016-08-01 12:44     ` Laurent Pinchart
2016-07-28 11:18 ` Mauro Carvalho Chehab
2016-07-28 11:24   ` Laurent Pinchart
2016-07-28 12:25     ` Mauro Carvalho Chehab
2016-07-28 16:04       ` Laurent Pinchart
2016-07-29  0:00         ` Luis R. Rodriguez
2016-08-01 12:50           ` Laurent Pinchart
2016-08-01 20:32             ` Luis R. Rodriguez
2016-07-29 13:57 ` Andrzej Hajda
2016-09-07 16:40   ` Kevin Hilman
2016-08-01 14:03 ` Marek Szyprowski
2016-11-03 18:43   ` Laurent Pinchart
2016-11-04  6:53     ` Marek Szyprowski
2016-09-08 21:03 ` Frank Rowand

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