From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>,
Hardik Shah <hardik.t.shah@intel.com>
Cc: alsa-devel@alsa-project.org, tiwai@suse.de, plai@codeaurora.org,
lgirdwood@gmail.com, linux-kernel@vger.kernel.org,
patches.audio@intel.com, broonie@kernel.org,
Sanyog Kale <sanyog.r.kale@intel.com>
Subject: Re: [alsa-devel] [RFC 09/14] SoundWire: Add support to handle Slave status change
Date: Mon, 14 Nov 2016 11:38:08 -0600 [thread overview]
Message-ID: <8f415778-f55a-3038-ec87-4b0ffea32b87@linux.intel.com> (raw)
In-Reply-To: <20161114160805.GO1575@localhost.localdomain>
On 11/14/16 10:08 AM, Charles Keepax wrote:
> There are some issues with this, as the slave driver only probes
> when the device actually shows up on the bus. However often
> (especially in embedded contexts) some things may need to be
> done to enable the slave. For example it may be held in reset or
> its power supplies switched off until they are need. As such it
> generally helps if the device probe can be called before it shows
> up on the bus, the device probe can then do the necessary actions
> to enable the device at which point it will show up on the bus.
Yes, this point was made at the LPC miniconference. What's not clear to
me is if you would want the codec driver to be notified that the bus is
operational and let it handle things like sideband power management for
that device, or is someone else needs to know.
next prev parent reply other threads:[~2016-11-14 17:38 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-21 12:40 [RFC 00/14] SoundWire bus driver Hardik Shah
2016-10-21 12:40 ` [RFC 01/14] SoundWire: Add SoundWire bus driver documentation Hardik Shah
2016-11-14 14:15 ` Charles Keepax
2016-11-15 14:29 ` Vinod Koul
2016-11-16 17:59 ` Mark Brown
2016-11-17 5:05 ` Vinod Koul
2016-10-21 12:41 ` [RFC 02/14] SoundWire: Add SoundWire stream documentation Hardik Shah
2016-11-14 15:31 ` Charles Keepax
2016-11-14 16:50 ` Pierre-Louis Bossart
2016-11-14 17:04 ` Charles Keepax
2016-10-21 12:41 ` [RFC 03/14] SoundWire: Add error handling and locking documentation Hardik Shah
2016-11-14 15:44 ` Charles Keepax
2016-11-15 14:42 ` Vinod Koul
2016-10-21 12:41 ` [RFC 04/14] SoundWire: Add device_id table for SoundWire bus Hardik Shah
2016-10-21 12:41 ` [RFC 05/14] SoundWire: Add SoundWire bus driver interfaces Hardik Shah
2016-11-14 13:17 ` Mark Brown
2016-11-14 17:28 ` [alsa-devel] " Pierre-Louis Bossart
2016-10-21 12:41 ` [RFC 06/14] SoundWire: Add register/unregister APIs Hardik Shah
2016-11-14 13:37 ` Mark Brown
2016-11-15 13:55 ` Vinod Koul
2016-10-21 12:41 ` [RFC 07/14] SoundWire: Add SoundWire Slaves register definitions Hardik Shah
2016-10-21 12:41 ` [RFC 08/14] SoundWire: Add API for Slave registers read/write Hardik Shah
2016-10-21 12:41 ` [RFC 09/14] SoundWire: Add support to handle Slave status change Hardik Shah
2016-11-14 16:08 ` Charles Keepax
2016-11-14 17:38 ` Pierre-Louis Bossart [this message]
2016-11-15 9:56 ` [alsa-devel] " Charles Keepax
2016-10-21 12:41 ` [RFC 10/14] SoundWire: Add support for clock stop Hardik Shah
2016-10-21 12:41 ` [RFC 11/14] SoundWire: Add tracing for Slave register read/write Hardik Shah
2016-10-21 12:41 ` [RFC 12/14] regmap: SoundWire: Add regmap support for SoundWire bus Hardik Shah
2016-10-28 18:03 ` Mark Brown
2016-11-02 8:11 ` Hardik Shah
2016-10-21 12:41 ` [RFC 13/14] SoundWire: Add stream and port configuration Hardik Shah
2016-10-21 12:41 ` [RFC 14/14] SoundWire: Add support for SoundWire stream management Hardik Shah
2016-11-14 12:11 ` [RFC 00/14] SoundWire bus driver Mark Brown
2016-11-15 13:37 ` Vinod Koul
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