From: Vinod Koul <vinod.koul@intel.com>
To: Randy Dunlap <rdunlap@infradead.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
LKML <linux-kernel@vger.kernel.org>,
ALSA <alsa-devel@alsa-project.org>, Mark <broonie@kernel.org>,
Takashi <tiwai@suse.de>,
Pierre <pierre-louis.bossart@linux.intel.com>,
Sanyog Kale <sanyog.r.kale@intel.com>,
Shreyas NC <shreyas.nc@intel.com>,
patches.audio@intel.com, alan@linux.intel.com,
Charles Keepax <ckeepax@opensource.cirrus.com>,
Sagar Dharia <sdharia@codeaurora.org>,
srinivas.kandagatla@linaro.org, plai@codeaurora.org,
Sudheer Papothi <spapothi@codeaurora.org>
Subject: Re: [PATCH 01/14] Documentation: Add SoundWire summary
Date: Thu, 19 Oct 2017 10:14:43 +0530 [thread overview]
Message-ID: <20171019044443.GE30097@localhost> (raw)
In-Reply-To: <670b9fc6-69b1-b7f8-19c7-18b1b12b7674@infradead.org>
Thanks for the quick review Randy,
On Wed, Oct 18, 2017 at 08:33:08PM -0700, Randy Dunlap wrote:
> On 10/18/17 20:03, Vinod Koul wrote:
> > +SoundWire is a new interface ratified in 2015 by the MIPI Alliance.
> > +SoundWire is used for transporting data typically related to audio
> > +functions. SoundWire interface is optimized to integrate audio devices in
> > +mobile or mobile inspired systems.
> > +
> > +SoundWire is a 2-Pin multi-drop interface with data and clock line. It
>
> 2-pin
ok
> > +The SoundWire protocol supports up to eleven Slave interfaces. All the
> > +interfaces share the common Bus containing data and clock line. Each of the
> > +Slaves can support up to 14 Data Ports. 13 Data Ports are dedicated to audio
> > +transport. Data Port0 is dedicated to transport of Bulk control information,
> > +each of the audio Data Ports (1..14) can support up to 8 Channels in
>
> (1..13) ??
nope. 1 to 14, both inclusive, thats why 14 Data Ports
> > +Bus:
> > +Implements SoundWire Linux Bus which handles the SoundWire protocol.
> > +It programs all the MIPI defined Slave registers. It represents a SoundWire
>
> MIPI-defined
>
> > +Master. There can be multiple instances of Bus maybe present in a system.
>
> eh?
> Multiple instances of Bus may be present in a system.
sounds better
> > +int sdw_add_bus_master(struct sdw_bus *bus)
> > +{
> > + if (!bus->dev)
> > + return -ENODEV;
> > +
> > + mutex_init(&bus->lock);
> > + INIT_LIST_HEAD(&bus->slaves);
> > +
> > + /* Check ACPI for Slave devices */
> > + sdw_acpi_find_slaves(bus);
> > +
> > + /* Check DT for Slave devices */
> > + sdw_of_find_slaves(bus);
>
> Please use same indentation as sdw_acpi_find_slaves().
ah not sure why it came like this, thanks for pointing out
> > +The MIPI specification requires each Slave interface to expose a unique
> > +48-bit identifier, stored in 6 read only dev_id registers. This dev_id
>
> read-only
right
> > +identifier, Bus enumerates the Slave device based on the 48-bit identifier.
> > +Slave device and driver match is done based on this 48-bit identifier. Probe
> > +of the Slave driver is called by Bus on successful match between device and
> > +driver id. A parent/child relationship is enforced between Slave and Master
>
> maybe reverse this order............. Master and Slave
>
> to be in the "parent/child" order? Unless I have them backwards?
right, will update this
> > +devices (the logical representation is aligned with the physical
> > +connectivity).
> > +
> > +The information on Master/Slave dependencies is stored in platform data,
> > +board-file, ACPI or DT. The MIPI Software specification defines an
>
ok
--
~Vinod
next prev parent reply other threads:[~2017-10-19 4:40 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-19 3:03 [PATCH 00/14] soundwire: Add a new SoundWire subsystem Vinod Koul
2017-10-19 3:03 ` [PATCH 01/14] Documentation: Add SoundWire summary Vinod Koul
2017-10-19 3:33 ` Randy Dunlap
2017-10-19 4:44 ` Vinod Koul [this message]
2017-10-20 10:39 ` Greg Kroah-Hartman
2017-10-20 15:49 ` Vinod Koul
2017-10-20 16:22 ` Greg Kroah-Hartman
2017-10-20 17:09 ` Vinod Koul
2017-10-21 8:57 ` Mark Brown
2017-10-21 11:28 ` Vinod Koul
2017-10-22 10:06 ` [alsa-devel] " Pierre-Louis Bossart
2017-10-23 8:21 ` Mark Brown
2017-10-23 7:50 ` Mark Brown
2017-10-23 11:18 ` [alsa-devel] " Vinod Koul
2017-10-19 3:03 ` [PATCH 02/14] soundwire: Add SoundWire bus type Vinod Koul
2017-10-19 7:40 ` Takashi Iwai
2017-10-19 8:32 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:11 ` Vinod Koul
2017-10-20 6:59 ` Takashi Iwai
2017-10-20 15:46 ` Vinod Koul
2017-10-20 15:50 ` Takashi Iwai
2017-10-20 16:11 ` Vinod Koul
2017-10-20 10:41 ` Greg Kroah-Hartman
2017-10-20 15:52 ` Vinod Koul
2017-10-20 10:45 ` Greg Kroah-Hartman
2017-10-20 16:01 ` Vinod Koul
2017-10-20 16:21 ` Greg Kroah-Hartman
2017-10-20 17:10 ` Vinod Koul
2017-10-23 11:46 ` Alan Cox
2017-10-26 8:33 ` Vinod Koul
2017-10-27 8:57 ` Greg Kroah-Hartman
2017-10-30 13:11 ` Vinod Koul
2017-10-20 16:03 ` Philippe Ombredanne
2017-10-20 16:20 ` Vinod Koul
2017-10-20 16:27 ` Greg Kroah-Hartman
2017-10-20 17:13 ` Vinod Koul
2017-10-23 11:52 ` Alan Cox
2017-10-21 9:03 ` Mark Brown
2017-10-21 11:29 ` Vinod Koul
2017-11-09 21:14 ` Srinivas Kandagatla
2017-11-10 4:59 ` Vinod Koul
2017-11-10 8:55 ` Vinod Koul
2017-11-10 10:50 ` Srinivas Kandagatla
2017-11-10 10:42 ` Srinivas Kandagatla
2017-11-10 10:58 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 03/14] soundwire: Add Master registration Vinod Koul
2017-10-19 8:54 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:19 ` Vinod Koul
2017-10-20 10:47 ` Greg Kroah-Hartman
2017-10-20 16:05 ` Vinod Koul
2017-10-21 9:12 ` Mark Brown
2017-10-21 11:35 ` Vinod Koul
2017-10-23 8:24 ` Mark Brown
2017-10-23 11:19 ` Vinod Koul
2017-11-09 21:14 ` Srinivas Kandagatla
2017-11-10 5:02 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 04/14] soundwire: Add MIPI DisCo property helpers Vinod Koul
2017-10-19 9:02 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:25 ` Vinod Koul
2017-10-21 9:20 ` Mark Brown
2017-10-21 11:37 ` Vinod Koul
2017-10-22 10:14 ` [alsa-devel] " Pierre-Louis Bossart
2017-10-19 3:03 ` [PATCH 05/14] soundwire: Add SoundWire MIPI defined registers Vinod Koul
2017-10-19 3:03 ` [PATCH 06/14] soundwire: Add IO transfer Vinod Koul
2017-10-19 9:13 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:30 ` Vinod Koul
2017-10-20 7:06 ` Takashi Iwai
2017-10-20 15:48 ` Vinod Koul
2017-10-21 9:29 ` Mark Brown
2017-10-21 11:40 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 07/14] regmap: Add SoundWire bus support Vinod Koul
2017-10-21 9:34 ` Mark Brown
2017-10-21 11:44 ` Vinod Koul
2017-10-23 11:56 ` Alan Cox
2017-10-23 13:16 ` Mark Brown
2017-10-19 3:03 ` [PATCH 08/14] soundwire: Add Slave status handling helpers Vinod Koul
2017-10-19 13:44 ` [alsa-devel] " Takashi Iwai
2017-10-31 13:04 ` Vinod Koul
2017-10-31 21:19 ` Pierre-Louis Bossart
2017-11-01 9:08 ` Vinod Koul
2017-11-01 21:10 ` Pierre-Louis Bossart
2017-11-02 3:28 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 09/14] soundwire: Add slave status handling Vinod Koul
2017-10-19 3:03 ` [PATCH 10/14] soundwire: Add sysfs for SoundWire DisCo properties Vinod Koul
2017-10-21 9:42 ` Mark Brown
2017-10-21 11:53 ` Vinod Koul
2017-11-09 21:14 ` Srinivas Kandagatla
2017-11-10 4:52 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 11/14] soundwire: cdns: Add cadence module Vinod Koul
2017-10-21 9:52 ` Mark Brown
2017-10-21 11:54 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 12/14] soundwire: cdns: Add sdw_master_ops and IO transfer support Vinod Koul
2017-10-19 3:03 ` [PATCH 13/14] soundwire: intel: Add Intel Master driver Vinod Koul
2017-10-19 3:03 ` [PATCH 14/14] soundwire: intel: Add Intel init module Vinod Koul
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