ASoC: codecs: wm8997: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20230315150745.67084-61-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm8997: Revert "ASoC: wm8997: Fix PM disable depth imbalance in wm8997_probe"

This reverts commit 41a736ac20602f64773e80f0f5b32cde1830a44a.

The pm_runtime_disable is redundant when error returns in
wm8997_probe, we just revert the old patch to fix it.

Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20221010114852.88127-4-zhangqilong3@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm8997: Fix PM disable depth imbalance in wm8997_probe

The pm_runtime_enable will increase power disable depth. Thus
a pairing decrement is needed on the error handling path to
keep it balanced according to context. We fix it by calling
pm_runtime_disable when error returns.

Fixes:40843aea5a9bd ("ASoC: wm8997: Initial CODEC driver")

Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220929150653.63845-2-zhangqilong3@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm8997: Fix PM disable depth imbalance in wm8997_probe

The pm_runtime_enable will increase power disable depth. Thus
a pairing decrement is needed on the error handling path to
keep it balanced according to context. We fix it by moving
pm_runtime_enable to the endding of wm8997_probe

Fixes:40843aea5a9bd ("ASoC: wm8997: Initial CODEC driver")

Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20220928160116.125020-2-zhangqilong3@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm*: Remove now redundant non_legacy_dai_naming flag

The ASoC core has now been changed to default to the non-legacy DAI
naming, as such drivers using the new scheme no longer need to specify
the non_legacy_dai_naming flag.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20220623125250.2355471-66-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Make the wm5102, wm5110, wm8997 and wm8998 drivers use the new jack library

Make all arizona codec drivers for which drivers/mfd/arizona-core.c used
to instantiate a "arizona-extcon" child-device use the new arizona-jack.c
library for jack-detection.

This has been tested on a Lenovo Yoga Tablet 2 1051L with a WM5102 codec.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Tested-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210307151807.35201-13-hdegoede@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm*: sync parameter naming (rate/sample_bits)

This patch syncs naming rule.

- xxx_rates;
+ xxx_rate;

- xxx_samplebits;
+ xxx_sample_bits;

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87czy6olh0.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Fix a wrong free in wm8997_probe

In the normal path, we should not free the arizona,
we should return immediately. It will be free when
call remove operation.

Fixes: 31833ead95c2c ("ASoC: arizona: Move request of speaker IRQs into bus probe")
Reported-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Acked-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20201111130923.220186-2-zhangqilong3@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Based on 2 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

ASoC: arizona: Add channel numbers to AIFs

Set the channel number on each AIF widget to allow unused channels not
to be powered up across AIFs.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Fixup some minor formatting issues

Repair any formatting/style issues that can be fixed without major
code refactoring.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: replace codec to component

Now we can replace Codec to Component. Let's do it.

Because there are many drivers which are using arizona,
we need to update these all related drivers in same time.
Otherwise compile error/warning happen

Note:

cs47l24
xxx_codec_xxx() -> xxx_component_xxx()
.idle_bias_off = 1 -> .idle_bias_on = 0
.ignore_pmdown_time = 0 -> .use_pmdown_time = 1
- -> .endianness = 1
- -> .non_legacy_dai_naming = 1

wm5102
xxx_codec_xxx() -> xxx_component_xxx()
.idle_bias_off = 1 -> .idle_bias_on = 0
.ignore_pmdown_time = 0 -> .use_pmdown_time = 1
- -> .endianness = 1
- -> .non_legacy_dai_naming = 1

wm5110
xxx_codec_xxx() -> xxx_component_xxx()
.idle_bias_off = 1 -> .idle_bias_on = 0
.ignore_pmdown_time = 0 -> .use_pmdown_time = 1
- -> .endianness = 1
- -> .non_legacy_dai_naming = 1

wm8997
xxx_codec_xxx() -> xxx_component_xxx()
.idle_bias_off = 1 -> .idle_bias_on = 0
.ignore_pmdown_time = 0 -> .use_pmdown_time = 1
- -> .endianness = 1
- -> .non_legacy_dai_naming = 1

wm8998
xxx_codec_xxx() -> xxx_component_xxx()
.idle_bias_off = 1 -> .idle_bias_on = 0
.ignore_pmdown_time = 0 -> .use_pmdown_time = 1
- -> .endianness = 1
- -> .non_legacy_dai_naming = 1

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: use snd_soc_component_init_regmap() on wm8997

To setup regmap, ALSA SoC has snd_soc_component_init_regmap() and
.get_regmap. But these are duplicated feature.
Let's use snd_soc_component_init_regmap() and remove .get_regmap

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Add support for setting the output volume limits

The output volume limits allow signals to be limited to specific levels
appropriate for the hardware attached. As this is a property of the
hardware itself these will be configured through device tree.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Add handling for audio related device tree entries

Currently all the audio related device tree entries are handled by the
MFD code, for most parts of the Arizona driver we group the device
tree handling with the component that uses it and should do so here as
well.

Add handling in the ASoC code for the audio device tree entries, a
later patch removes the MFD side handling but there is no harm in it
being duplicated temporarily.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Add new common Arizona init function

Currently the driver has quite a few small initialisation functions, in
preparation for some refactoring add a new function arizona_init_common.
This will be used bus probe level initialisation that is common across
Arizona devices. For now just move the notifier chain initialisation in
there.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Propagate errors from arizona_spk_init

arizona_spk_init uses snd_soc_dapm_new_control which since
commit 37e1df8c95e2 ("ASoC: dapm: handle probe deferrals") will
occasionally request a probe deferral. Which means we should propagate the
error out of our driver from it.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Use component pin control functions

We need to modify the state of some of our own pins and are currently
not taking account that the pin name may have a name_prefix applied
to it.

Replace the snd_soc_dapm_x_pin functions with the equivalent
snd_soc_component_x_pin functions so that any name_prefix will be
handled automatically.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Call arizona_init_notifiers for all CODECs

The call to arizona_init_notifiers was only added for CODECs that are
generating voice trigger events, however, this is somewhat annoying
for machine drivers that might be used with multiple CODECs as they
need to conditionally register for the notifier, depending on the
CODEC being attached.

As the cost of initialising the notifier is so minimal, and we may
well add other events in the future that apply to more CODECs, simply
do this for all Arizona CODECs.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Move request of speaker IRQs into bus probe

It is more idiomatic to request all resources in the bus level probe,
this patch moves the request of the speaker thermal event IRQs from the
ASoC level probe into the bus level probe.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Add gating for clock when used for direct MCLK

Whilst ultimately we would like to move all the clocking over to the
clock framework, as an intermediate step to get people going for now
gating the source clocks for SYSCLK/ASYNCCLK when they are configured
to come directly from an MCLK pin.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: constify snd_soc_codec_driver structures

Check for snd_soc_codec_driver structures that are only passed to
snd_soc_register_codec or memcpy (2nd arg), for which the corresponding
parameters are declared const. Declare as const snd_soc_codec_driver
structures that have these properties.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct snd_soc_codec_driver i@p = { ... };

@ok@
identifier r.i;
expression e1,e2,e3;
position p;
@@
(
snd_soc_register_codec(e1,&i@p,e2,e3)
|
memcpy(e1,&i@p,e2)
)

@bad@
position p != {r.p,ok.p};
identifier r.i;
@@
i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
struct snd_soc_codec_driver i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: codec duplicated callback function goes to component on wm8997

codec driver and component driver has duplicated callback functions,
and codec side functions are just copied to component side when
register timing. This was quick-hack, but no longer needed.
This patch moves these functions from codec driver to component driver.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Free speaker thermal IRQs in CODEC remove

The thermal warning IRQs for the speaker are requested in CODEC probe
but never freed. This patch frees them in CODEC remove.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Add support for SNDRV_PCM_RATE_KNOT

The Arizona CODECs support several rates that do not have simple defines
in ALSA. This patch adds support for SNDRV_PCM_RATE_KNOT so that users
can open stream at these rates. As part of this we should always set
constraints in arizona_startup, currently we only set the constraints if
we already have a clock to limit rates to that family of sample rates.
This patch updates this to set a constraint of all rates supported by
the chip if we do not already know which family of rates to limit to.
Finally we also reduce the list of rates supported in the constraints to
only include those that are supported on current parts.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Implement stability check for LHPF coefficients

Specifying unstable coefficients for the low/high pass filters can have
a severe impact on the audio. This patchs adds a stability check on the
coefficients written to the low/high pass filter block to prevent this.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Implement stability check for EQ coefficients

Specifying unstable coefficients for the EQ can have a severe impact on
the audio. This patchs adds a stability check on the coefficients
written to the EQ, for this it is necessary to merge the mode control
and the coefficients as some coefficients may only be unstable with a
certain mode setting so it is ideal if these are always updated in sync.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Export functions to control subsystem DVFS

The WM5102 and WM8997 codecs have an internal dynamic clock booster.
When this booster is active, the DCVDD voltage must be increased.
If all the currently active audio paths can run with the root SYSCLK
we can disable the booster, allowing us to turn down DCVDD voltage
to save power.

Previously this was being done by having the booster enable bit set
as a side-effect of the LDO1 regulator driver, which is unexpected
behaviour of a regulator and not compatible with using an external
regulator. [Originally this was documented as a feature of the internal
LDO -- broonie]

This patch exports functions to handle the booster enable and
DCVDD voltage, with each relevant subsystem flagging whether it can
currently run without the booster. Note that these subsystems are
stateless and none of them are nestable, so there's no need for
reference counting, we only need a simple boolean for each subsystem
of whether their current condition could require the booster or will
allow us to turn the codec down to lower operating power.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm8997: Replace direct snd_soc_codec dapm field access

The dapm field of the snd_soc_codec struct is eventually going to be
removed, in preparation for this replace all manual access to codec->dapm
with snd_soc_codec_get_dapm().

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Fix noise generator gain TLV

The Arizona codec drivers had an incorrect dB scaling for the
noise generator gain that started at 0dB and went upwards.
Actually the highest setting is 0dB.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

ASoC: arizona: Coalesce output power up delays

Save a bit of scheduling by coalescing all the output power up delays
into a single delay.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: arizona: Add delay for output disable

Give the output disable sequence a chance to fully complete, otherwise
there is a danger we may remove the clock before it is finished
resulting in a pop noise. The delay for each output must be cumulative
and these are coalesced into a single delay.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: wm8997: Replace w->codec snd_soc_dapm_to_codec(w->dapm)

The codec field of the snd_soc_widget struct is eventually going to be
removed, use snd_soc_dapm_to_codec(w->dapm) instead.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: codecs: drop owner assignment from platform_drivers

A platform_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

ASoC: wm8997: Set symmetric samplebits on AIFs

Different playback and capture bits-per-sample
are not supported on the AIFs

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Fix compile error

The macro's name is SOC_ENUM, not SOC_VALUE.

Fixes: e13dd8ce ("ASoC: wm8997: Replace usage deprecated MUX/ENUM macros")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Replace usage deprecated MUX/ENUM macros

SOC_VALUE_ENUM, SND_SOC_DAPM_VALUE_MUX and SOC_DAPM_VALUE_ENUM are deprecated
and merely an alias for SOC_ENUM, SND_SOC_DAPM_MUX and SOC_DAPM_ENUM. Replace
the deprecated macros so we can eventually remove their definition.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: codec: fix the sparse check warnings.

Some thing Likes:

reproduce: make C=1 CF=-D__CHECK_ENDIAN__

sparse warnings: (new ones prefixed by >>)

>> sound/soc/codecs/wm8997.c:1084:15: sparse: symbol \
'wm8997_get_regmap' was not declared. Should it be static?

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Remove the set_cache_io() entirely from ASoC probe.

As we can set the CODEC I/O while snd_soc_register_codec(), so the
calling of set_cache_io() from CODEC ASoC probe could be removed
entirely.

And then we can set the CODEC I/O in the device probe instead of
CODEC ASoC probe as earily as possible.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: io: New signature for snd_soc_codec_set_cache_io()

Now that all users have been converted to regmap and the config.reg_bits
and config.val_bits can be setted by each user through regmap core API.
So these two params are redundant here.

Since the only control type that left is SND_SOC_REGMAP, so remove it. Drop
the control params and add struct regmap *regmap to simplify the code.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm{5102, 5110, 8997}: Replace codec->control_data with arizona->regmap

With the ongoing component-ization of the ASoC framework and the continuing
migration to using regmap for IO the control_data field of the snd_soc_codec
struct will eventually be removed. Prepare the wm5192, wm5110 and wm8997
drivers for this by using arizona->regmap instead of accessing the CODEC's
control_data field.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Use ARRAY_SIZE() for SOC_VALUE_ENUM_SINGLE()

... to make clear the meaning of the argument.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Correct typo in EQ coefficient sizes

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Improve EQ coefficient controls

The EQ coefficient binary controls overlapped with the volume controls
for the B4 and B5 volumes, which were controllable from either the
coefficient control or the volume control itself.

This patch adds controls for the mode and moves the coefficient control
to only cover the coefficients.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Use async writes

When writing the patch write to the device asynchronously, allowing better
performance when used with a bus like SPI which supports this by
minimising the need to context switch back to the driver to get the
next bit of data.

Signed-off-by: Mark Brown <broonie@linaro.org>
Reviewed-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>

ASoC: arizona: Fix typo in name of EQ coefficient controls

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Correct typo in ISRC mux routes

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Add inputs for noise and mic mixers

The noise and mic mixer inputs were not connected, do so.

Signed-off-by: Mark Brown <broonie@linaro.org>

ASoC: wm8997: Initial CODEC driver

The wm8997 is a compact, high-performance audio hub CODEC with SLIMbus
interfacing, for smartphones, tablets and other portable audio devices
based on the Arizona platform.

This patch adds the wm8997 CODEC driver.

[Fixed some interface churn from bitrot due to the patch not going via
the MFD tree as expected -- broonie]

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>