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One initial setting is 5 bytes, so num_init_writes should divide by 5.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250721112334.388506-1-shumingf@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Use the previously parsed DisCo information from ACPI to create the DAI
drivers required to connect an SDCA Function into an ASoC soundcard.
Create DAI driver structures and populate the supported sample rates
and sample widths into them based on the Input/Output Terminal and any
attach Clock Source entities. More complex relationships with channels
etc. will be added later as constraints as part of the DAI startup.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250516131011.221310-8-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Use the previously parsed DisCo information from ACPI to create the
ALSA controls required by an SDCA Function. This maps all User and
Application level SDCA Controls to ALSA controls. Typically controls
marked with those access levels are just volumes and mutes.
SDCA defines volume controls as an integer in 1/256ths of a dB and
then provides a mechanism to specify what values are valid (range
templates). Currently only a simple case of a single linear volume
range with a power of 2 step size is supported. This allows the code
to expose the volume control using a simple shift. This will need
expanded in the future, to support more complex ranges and probably
also some additional control types but this should be sufficient to
for a first pass.
For non-dataport terminal widgets also add a pin switch to allow
that endpoint to be turned on/off.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250516131011.221310-7-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Use the previously parsed DisCo information from ACPI to create DAPM
widgets and routes representing a SDCA Function. For the most part SDCA
maps well to the DAPM abstractions.
The primary point of interest is the SDCA Power Domain Entities
(PDEs), which actually control the power status of the device. Whilst
these PDEs are the primary widgets the other parts of the SDCA graph
are added to maintain a consistency with the hardware abstract,
and allow routing to take effect. As for the PDEs themselves the
code currently only handle PS0 and PS3 (basically on and off),
the two intermediate power states are not commonly used and don't
map well to ASoC/DAPM.
Other minor points of slightly complexity include, the Group Entities
(GEs) these set the value of several other controls, typically
Selector Units (SUs) for enabling a cetain jack configuration. Multiple
SUs being controlled by a GE are easily modelled creating a single
control and sharing it among the controlled muxes.
SDCA also has a slight habit of having fully connected paths, relying
more on activating the PDEs to enable functionality. This doesn't
map quite so perfectly to DAPM which considers the path a reason to
power the PDE. Whilst in the current specification Mixer Units are
defined as fixed-function, in DAPM we create a virtual control for
each input (which defaults to connected). This allows paths to be
connected/disconnected, providing a more ASoC style approach to
managing the power. PIN_SWITCHs will also be added for non-dataport
terminal entities in a later patch along with the other ALSA controls,
providing greater flexibility in power management.
A top level helper sdca_asoc_populate_component() is exported that
counts and allocates everything, however, the intermediate counting and
population functions are also exported. This will allow end drivers to
do allocation and add custom handling, which is probably fairly likely
for the early SDCA devices.
Clock muxes are currently not fully supported, so some future work will
also be required there.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250516131011.221310-6-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Move the allocation of the PDE delays array until after the size has
been adjusted, this saves an additional division and simplifies the
code slightly.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250516131011.221310-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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There is no need to include MODULE_LICENSE() and MODULE_DESCRIPTION() in
sdca_regmap.c as this file is part of a larger module that already
defines these.
Fixes: e3f7caf74b79 ("ASoC: SDCA: Add generic regmap SDCA helpers")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250516131011.221310-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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mipi-sdca-ge-selectedmode-controls-affected is actually required by the
specification so the code should return an error if it is missing.
Reported-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
Fixes: 13fe7497af19 ("ASoC: SDCA: Add support for GE Entity properties")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250321135324.380237-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add support for parsing the Group Entity properties from DisCo/ACPI.
Group Entities allow control of several other Entities, typically
Selector Units, from a single control.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250312172205.4152686-7-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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SDCA Controls come in a variety of data formats, to simplify later
parsing work out this data type as the control is parsed and stash it
for later use.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250312172205.4152686-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Implementation defined controls will not be present in the large list of
known controls for SDCA. The driver should not return an error for these,
because it is perfectly legal to have implementation defined controls.
Update the handling to instead generate a generic name.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250312172205.4152686-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Use the cleanup.h helpers to manage some local buffers, this cleans up
the error paths a little.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250312172205.4152686-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Slightly neaten up the initialization write code to overlay a struct
rather than shifting the pointer along manually. This also removes the
Sparse warning:
sound/soc/sdca/sdca_functions.c:233:36: warning: cast to restricted __le32
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250312172205.4152686-2-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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The concept of an SDCA default value differs slightly from the regmap
usage of the term. An SDCA default is a value that is parsed from DisCo
and then written out to the hardware if no user value has superceded
it. Add a helper function that will iterate through all the SDCA
Controls and write out any default values. After these have been written
out once they will exist in the cache and that will take care of any
user values superceeding them. The code here also writes out any
Controls with a fixed value as there is only one available value for
these Controls there is no point in allowing the user to select them,
simply treat them similarly to a default.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250217140159.2288784-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add helpers to parse the DisCo Constant values from ACPI and populate an
array of reg_defaults with these. This will allow drivers to access
these ACPI specified values through the same interface as other
registers that are physically present on the device, using the regmap
cache.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250217140159.2288784-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add helper functions that SDCA drivers can use to calculate the
properties of SDCA Controls (registers) specified through DisCo.
Most of these are fairly obvious from the SDCA Access Modes.
DisCo Constants, values which are specified in the ACPI rather than on
the device, are handled as unreadable and unwritable registers. The
intention is these will be populated in the register defaults table
allowing drivers to read them normally. This means the drivers can be
agnostic as to which values are DisCo Constants.
Finally, support for SDCA Dual Ranked Controls is currently limited
here, at the moment the current value will be used directly. Writing
the current value directly is valid as per the specification
although the synchronicity of updates across multiple registers is
lost. Support for this will probably need to be added later. But its a
fairly hard problem and doesn't need to be solved immediately.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250217140159.2288784-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add support for parsing the Power Domain Entity properties from
DisCo/ACPI.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-11-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add support for parsing the Clock Source Entity properties from
DisCo/ACPI.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-10-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add support for parsing the Input/Output Terminal Entity properties from
DisCo/ACPI.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-9-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Within SDCA collections of Channels are referred to as Clusters, each
Channel within a Cluster can have various properties attached to it.
For example a stereo audio stream, would have a Cluster with 2 Channels
one marked as left and the other as right. Various Clusters are
specified in DisCo/ACPI and controls then allow the class driver to
select between these channel configurations. Add support for parsing
these Cluster definitions.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-8-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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DisCo/SDCA contains small buffers of data that hold ranges of valid
values for the various SDCA Controls. Add support for parsing these
from ACPI.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-7-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Each SDCA Entity will contain a number of Controls, these are
basically equivalent to registers. Although a single Control will only
ever contain a single field. Some of these would map directly to ALSA
controls once more of the SDCA class driver is implemented. These
controls are parsed out of the DisCo ACPI tables.
One small todo here is that each Control can have multiple
sub-entries (Control Numbers), these are typically used to represent
channels. Whilst support is present for these, currently the
ACPI properties that would allow differing defaults for each channel
are not parsed. But there is nothing here that should prevent that
being added in the future.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-6-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Within SDCA there is a special Entity called Entity 0 which is used
to hold Function level controls. Whilst Entity 0 isn't a full SDCA
Entity, it is helpful to add an sdca_entity structure for it. This
will allow it to be treated identically in the code that handles
SDCA Controls.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Each SDCA Function may contain a table of register writes that should be
written out before the Function is used. Add code to parse this table
from the DisCo tables in ACPI.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add a helper function to parse all the Function and Entity
information from ACPI. In SDCA each device may have several Functions
and each corresponds to a specific audio capability such as say
amplifier playback or microphone capture. Each Function then contains
a number of Entities that represent individual parts of the audio
signal chain and are linked together in a graph similar to DAPM.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Fix up some variable/struct member naming, add some missing kerneldoc
and fix some minor formatting/whitespace issues.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250205113801.3699902-2-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Currently, patch_sdca_function_type() both patches the function type
for older SDCA revisions, and reports the name of the function. In
general it is cleaner to have a single function only do a single
task, so split these operations into two separate functions.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20241220173516.907406-5-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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It is not helpful to error out on some SDCA function types, we
might as well report the correct name and let the driver core
simply not bind a driver to those functions for which the code
lacks support. Also given no functions currently have support,
it seems odd to select some as unsupported.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20241220173516.907406-4-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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SDCA only supports 3-bits for the function address, but the ACPI value
is 64-bits. Update the code that parses this to do a bounds check
and error out on invalid addresses. Currently, an invalid address
would truncate to the bottom 3-bits when used and thus use a likely
incorrect address. With the bounds check, it is also now safe to
shrink the size of the adr member of sdca_function_desc to a u8 and
rearrange the struct members to pack better with the new size of adr.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20241220173516.907406-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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All the error messages in the SDCA code manually print the function
in the output, update these to use dev_fmt instead. Whilst making
the changes tweak a couple of the error messages to make them a
little shorter.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20241220173516.907406-2-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Several of the SDCA files don't include all the headers they use
locally. These are included by the point of use through other
headers, so it is not currently causing any issues. However, files
should directly include things they directly use, so add the
missing header includes.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20241220173516.907406-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Commit cdd30ebb1b9f ("module: Convert symbol namespace to string
literal") changes the arguments for various module symbol macros
including some that we've aded new uses for. Merge the commit up to
avoid problems in -next.
Signed-off-by: Mark Brown <broonie@kernel.org>
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We should use *-y instead of *-objs in Makefile for the module
objects. *-objs is used rather for host programs.
Fixes: 3a513da1ae33 ("ASoC: SDCA: add initial module")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20241203141823.22393-4-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
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Clean up the existing export namespace code along the same lines of
commit 33def8498fdd ("treewide: Convert macro and uses of __section(foo)
to __section("foo")") and for the same reason, it is not desired for the
namespace argument to be a macro expansion itself.
Scripted using
git grep -l -e MODULE_IMPORT_NS -e EXPORT_SYMBOL_NS | while read file;
do
awk -i inplace '
/^#define EXPORT_SYMBOL_NS/ {
gsub(/__stringify\(ns\)/, "ns");
print;
next;
}
/^#define MODULE_IMPORT_NS/ {
gsub(/__stringify\(ns\)/, "ns");
print;
next;
}
/MODULE_IMPORT_NS/ {
$0 = gensub(/MODULE_IMPORT_NS\(([^)]*)\)/, "MODULE_IMPORT_NS(\"\\1\")", "g");
}
/EXPORT_SYMBOL_NS/ {
if ($0 ~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+),/) {
if ($0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/ &&
$0 !~ /(EXPORT_SYMBOL_NS[^(]*)\(\)/ &&
$0 !~ /^my/) {
getline line;
gsub(/[[:space:]]*\\$/, "");
gsub(/[[:space:]]/, "", line);
$0 = $0 " " line;
}
$0 = gensub(/(EXPORT_SYMBOL_NS[^(]*)\(([^,]+), ([^)]+)\)/,
"\\1(\\2, \"\\3\")", "g");
}
}
{ print }' $file;
done
Requested-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://mail.google.com/mail/u/2/#inbox/FMfcgzQXKWgMmjdFwwdsfgxzKpVHWPlc
Acked-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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sdca_lookup_functions may be called by a Peripheral that is not listed
in the ACPI table. Testing adev is required to avoid kernel NULL pointer
dereference.
Fixes: 3a513da1ae33 ("ASoC: SDCA: add initial module")
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://patch.msgid.link/20241113064133.162501-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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SND_SOC_SDCA can't be optional when SND_SOC_ACPI_INTEL_SDCA_QUIRKS is
selected. IS_REACHABLE can prevent the link error. However it is not
suitable for this case. When CONFIG_SND_SOC_ACPI_INTEL_SDCA_QUIRKS is
Y and CONFIG_SND_SOC_SDCA is M, the SDCA helpers will be empty and
return false. But we need the helpers to do their jobs whenSND_SOC_SDCA
is M.
IOW, the SDCA library is not optional for Intel platforms where the
SDCA_QUIRK is selected.
Also, make SND_SOC_SDCA invisible. SND_SOC_SDCA should be selected if
a device supports SDCA. User should not unselect it.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202411021722.DiX1Y5sf-lkp@intel.com/
Suggested-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://patch.msgid.link/20241106055810.10123-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add a generic match function for quirks, chances are we are going to
have lots of those...
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://patch.msgid.link/20241016102333.294448-6-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add new module for SDCA (SoundWire Device Class for Audio) support.
For now just add a parser to identify the SDCA revision and the
function mask.
Note that the SDCA definitions and related MIPI DisCo properties are
defined only for ACPI platforms and extracted with _DSD helpers. There
is currently no support for Device Tree in the specification, the
'depends on ACPI' reflects this design limitation. This might change
in a future revision of the specification but for SDCA 1.0 ACPI is the
only supported type of platform firmware.
The SDCA library is defined with static inline fallbacks, which will
allow for unconditional addition of SDCA support in common parts of
the code.
The design follows a four-step process:
1) Basic information related to Functions is extracted from MIPI DisCo
tables and stored in the 'struct sdw_slave'. Devm_ based memory
allocation is not allowed at this point prior to a driver probe, so we only
store the function node, address and type.
2) When a codec driver probes, it will register subdevices for each
Function identified in phase 1)
3) a driver will probe for each subdevice and addition parsing/memory
allocation takes place at this level. devm_ based allocation is highly
encouraged to make error handling manageable.
4) Before the peripheral device becomes physically attached, register
access is not permitted and the regmaps are cache-only. When
peripheral device is enumerated, the bus level uses the
'update_status' notification; after optional device-level
initialization, the codec driver will notify each of the subdevices so
that they can start interacting with the hardware.
Note that the context extracted in 1) should be arguably be handled
completely in the codec driver probe. That would however make it
difficult to use the ACPI information for machine quirks, and
e.g. select different machine driver and topologies as done for the
RT712_VB handling later in the series. To make the implementation of
quirks simpler, this patchset extracts a minimal amount of context
(interface revision and number/type of Functions) before the codec
driver probe, and stores this context in the scope of the 'struct
sdw_slave'.
The SDCA library can also be used in a vendor-specific driver without
creating subdevices, e.g. to retrieve the 'initialization-table'
values to write platform-specific values as needed.
For more technical details, the SDCA specification is available for
public downloads at https://www.mipi.org/mipi-sdca-v1-0-download
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://patch.msgid.link/20241016102333.294448-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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