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2017-08-21ASoC: sun4i-i2s: Add support for H3Marcus Cooper
The sun8i-h3 introduces a lot of changes to the i2s block such as different register locations, extended clock division and more operational modes. As we have to consider the earlier implementation then these changes need to be isolated. None of the new functionality has been implemented yet, the driver has just been expanded to allow it work on the H3 SoC. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: Update global enable with bitmaskMarcus Cooper
The default value of the config register is different on newer SoCs and therefore enabling/disabling with a register write will clear bits used to set the direction of the clock and frame pins. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: Check for slave select bitMarcus Cooper
The newer SoCs do not have this setting. Instead they set the pin direction. Add a check to see if the bit is valid and if so set it accordingly. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: Add regmap field to set DAI formatMarcus Cooper
On the newer SoCs the bits to configure the operational mode are located in a different register. Add a regmap field so that this location can be configured. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: Add mclk enable regmap fieldMarcus Cooper
The location of the mclk output enable bit is different on newer SoCs. Use a regmap field to enable it. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: bclk and lrclk polarity tidyupMarcus Cooper
On newer SoCs the bit fields for the blck and lrclk polarity are in a different locations. Use regmap fields to set the polarity bits as intended. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: Add regfields for word size select and sample resolutionMarcus Cooper
On newer SoCs the location of the slot width select and sample resolution are different and also there is a bigger range of support. For the current supported rates then an offset is required. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-i2s: Add regmap fields for channelsMarcus Cooper
On the original i2s block the channel mapping and selection were configured for stereo audio by default: This is not the case with the newer SoCs and they are also located at different offsets. To support the newer SoC then regmap fields have been added to the quirks and these are initialised to their correct settings during probing. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-21ASoC: sun4i-codec: Remove unnecessary function callDonglin Peng
First of all,the address of pdev->dev is assigned to card->dev in create_card,then the function platform_set_drvdata copies the value the variable card to pdev->dev.driver_data, but when calling snd_soc_register_card,the function dev_set_drvdata(card->dev, card) will also do the same copy operation,so i think that the former copy operation can be removed. Signed-off-by: Peng Donglin <dolinux.peng@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-14ASoC: sun4i-i2s: Add TX FIFO offset to quirksMarcus Cooper
It has been seen that the newer SoCs have a different TX FIFO address. Add this to the quirks structure. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-14ASoC: sun4i-i2s: Add regmap config to quirksMarcus Cooper
The newer SoCs have a larger range than the original SoC that this driver was developed for. By adding the regmap config to the quirks then the driver can initialise the managed register map correctly. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-14ASoC: sun4i-i2s: Add clkdiv offsets to quirksMarcus Cooper
The BCLKDIV and MCLKDIV found on newer SoCs start from an offset of 1. Add the functionality to adjust the division values according to the needs to the device being used. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-07ASoC: sunxi: make snd_soc_codec_driver structures as constBhumika Goyal
Declare snd_soc_codec_driver structures as const as they are either passed as an argument to the function snd_soc_register_codec or stored as reference in field codec of type sun4i_codec_quirks. Both the fucntion argument and the codec field are of type const, so declare the structures with this property as const. Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-08-01ASoC: sun4i-i2s: Extend quirks scopeMarcus Cooper
In preparation for the changes required to support newer SoCs then quirks has been moved and also added to the device structure. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-07-26ASoC: sun4i-spdif: Handle return value of clk_prepare_enable.Arvind Yadav
clk_prepare_enable() can fail here and we must check its return value. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-07-19ASoC: sun4i: explicitly request exclusive reset controlPhilipp Zabel
Commit a53e35db70d1 ("reset: Ensure drivers are explicit when requesting reset lines") started to transition the reset control request API calls to explicitly state whether the driver needs exclusive or shared reset control behavior. Convert all drivers requesting exclusive resets to the explicit API call so the temporary transition helpers can be removed. No functional changes. Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Mark Brown <broonie@kernel.org> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Chen-Yu Tsai <wens@csie.org> Cc: alsa-devel@alsa-project.org Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-07-17ASoC: sun8i-codec: constify snd_soc_dai_ops structureGustavo A. R. Silva
This structure is only stored in the ops field of a snd_soc_dai_driver structure. That field is declared const, so snd_soc_dai_ops structures that have this property can be declared as const also. Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-07-17ASoC: sun4i-codec: Remove unneeded gpiod NULL checkFabio Estevam
The gpiod API checks for NULL descriptors, so there is no need to duplicate the check in the driver. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-06-06ASoC: sun4i-codec: Add support for V3s codecIcenowy Zheng
The codec in the V3s is similar to the one found on the A31. One key difference is the analog path controls are routed through the PRCM block. This is supported by the sun8i-codec-analog driver, and tied into this codec driver with the audio card's aux_dev. In addition, the V3s does not have LINEIN, LINEOUT, MBIAS and MIC2, MIC3, and the FIFO related registers are like H3. Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-06-06ASoC: sun8i-codec-analog: add support for V3s SoCIcenowy Zheng
The V3s SoC features an analog codec with headphone support but without mic2 and linein. Add support for it. Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-06-06ASoC: sun8i-codec-analog: prepare a mixer control/widget/route set for V3sIcenowy Zheng
Allwinner V3s has an analog codec without MIC2 and Line In, which will need a special set of mixer controls/widgets/routes, otherwise meaningless controls will be exported to userspace and confuse the user. Add the special set, and use it when the SoC has no MIC2 and Line In. Signed-off-by: Icenowy Zheng <icenowy@aosc.io> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-05-24ASoC: sun8i-codec-analog: split out mbiasIcenowy Zheng
Allwinner V3s features an analog codec without MBIAS pin. Split out this part, in order to prepare for the V3s analog codec. Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-15ASoC: sun8i-codec: Convert to use SND_SOC_DAPM_AIF_INMylène Josserand
Update the driver to use SND_SOC_DAPM_AIF_IN instead of SND_SOC_DAPM_DAC. Rename the interface's widgets to be more precise on which slot the interface is connected. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-15ASoC: sun8i-codec: Fix space on audio-routing widgetMylène Josserand
An unwanted space is present in an audio widget's name on the dapm routing. It causes an error on the recognition of this widget (error: ("no dapm match for AIF1 Slot 0 Right"). Remove the space fixes it. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-15ASoC: sun8i-codec-analog: split out line inIcenowy Zheng
Allwinner V3s features an analog codec without LINEIN. Split out this part, in order to prepare for the V3s analog codec. Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-15ASoC: sun8i-codec-analog: split out mic2Icenowy Zheng
Allwinner V3s features an analog codec without MIC2. Split out this part, in order to prepare for the V3s analog codec. Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-08ASoC: sun8i-codec: Convert to SOC_MIXER_ARRAYMylène Josserand
SOC_MIXER_ARRAY is a simplified function of SND_SOC_DAPM_MIXER which handles automatically the ARRAY_SIZE of controls. Update the driver to use SOC_MIXER_ARRAY. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-08ASoC: sun8i-codec: Update mixer to use SOC_DAPM_DOUBLEMylène Josserand
Update the driver to use the new SOC_DAPM_DOUBLE definition on the digital DAC mixer. Update the names accordingly as, when they are shared, the controls are not prefixed with the widget's name anymore. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-03-08ASoC: sun8i-codec: Remove analog "HP" widgetMylène Josserand
The "HP" widget is already present and take part to the analog part (sun8i-codec-analog). Remove it from the digital part as it is unnecessary. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-19Merge remote-tracking branches 'asoc/topic/rt5665', 'asoc/topic/rt5677', ↵Mark Brown
'asoc/topic/samsung', 'asoc/topic/simple' and 'asoc/topic/sunxi' into asoc-next
2017-02-19ASoC: sun4i-spdif: drop unnessary snd_soc_unregister_component()Wei Yongjun
It's not necessary to unregister a component registered with devm_snd_soc_register_component(). Also removed pointness clk_disable_unprepare() from error path and snd_soc_unregister_platform() from the remove. Fixes: f8260afa444b ("ASoC: sunxi: Add support for the SPDIF block") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-08ASoC: sunxi: allow the analog codec driver to be built on ARM64Icenowy Zheng
As the 64-bit Allwinner H5 SoC has the same analog codec part (also the same digital part) as H3, enable the driver to be built on ARM64 Allwinner platform, so that it can be used on H5. Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-03ASoC: sun4i-i2s: Add quirks to handle a31 compatibleMylène Josserand
Some SoCs have a reset line that must be asserted/deasserted. This patch adds a quirk to handle the new compatible "allwinner,sun6i-a31-i2s" which will deassert the reset line on probe function and assert it on remove's one. This new compatible is useful in case of A33 codec driver, for example. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-03ASoC: Add sun8i digital audio codecMylène Josserand
Add the sun8i audio codec which handles the digital register of A33 codec. The driver handles only the basic playback from the DAC to headphones. All other features (microphone, capture, etc) will be added later. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-02-03ASoC: sun8i-codec-analog: Add amplifier event to fix first delayMylène Josserand
When playing a sound for the first time, a short delay, where the audio file is not played, can be noticed. On a second play (right after), the sound is played correctly. If we wait a short time (~5 sec which corresponds to the aplay timeout), the delay is back. This patch fixes it by using an event on headphone amplifier. It allows to keep the amplifier enable while playing a sound. A delay of 700ms allows to wait that the amplifier is powered-up before playing the sound. Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-01-20ASoC: sun4i-spdif: Add support for the H3 SoCMarcus Cooper
The H3 SoC uses the same SPDIF block as found in earlier SoCs, but its TXFIFO is mapped to another address. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-01-17ASoC: sun4i-i2s: Increase DMA max burst to 8Mylène Josserand
As done previously for sun4i-codec, the DMA maxburst of 4 is not supported by every SoCs so the DMA controller engine returns "unsupported value". As a maxburst of 8 is supported by all variants, this patch increases it to 8. For more details, see commit from Chen-Yu Tsai: commit 730e2dd0cbc7 ("ASoC: sun4i-codec: Increase DMA max burst to 8") Signed-off-by: Mylène Josserand <mylene.josserand@free-electrons.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2017-01-09ASoC: sun4i-codec: Add "Right Mixer" to "Line Out Mono Diff." routeChen-Yu Tsai
The mono differential output for "Line Out" downmixes the stereo audio from the mixer, instead of just taking the left channel. Add a route from the "Right Mixer" to "Line Out Source Playback Route" through the "Mono Differential" path, so DAPM doesn't shut down everything if the left channel is muted. Fixes: 0f909f98d7cb ("ASoC: sun4i-codec: Add support for A31 Line Out playback") Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-12-31ASoC: sun4i-spdif: Add quirks to the spdif driverMarcus Cooper
It has been seen that some newer SoCs have a different TX FIFO address and we already have the difference with the A31 requiring a reset. Add a quirks structure so that these can be managed easily. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-12-31ASoC: sun4i-spdif: remove legacy dapm componentsMarcus Cooper
The dapm components are now handled by the ALSA SoC SPDIF DIT driver so can be removed. Signed-off-by: Marcus Cooper <codekipper@gmail.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-30ASoC: sun4i-codec: Add support for H3 codecChen-Yu Tsai
The codec on the H3 is similar to the one found on the A31. One key difference is the analog path controls are routed through the PRCM block. This is supported by the sun8i-codec-analog driver, and tied into this codec driver with the audio card's aux_dev. In addition, the H3 has no HP (headphone) and HBIAS support, and no MIC3 input. The FIFO related registers are slightly rearranged. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-30ASoC: sun4i-codec: Add support for A23 codecChen-Yu Tsai
The codec in the A23 is similar to the one found on the A31. One key difference is the analog path controls are routed through the PRCM block. This is supported by the sun8i-codec-analog driver, and tied into this codec driver with the audio card's aux_dev. In addition, the A23 does not have LINEOUT, and it does not support headset jack detection or buttons. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-24ASoC: sunxi: Uninitialized variable in probe()Dan Carpenter
Oddly enough, my version of GCC misses this uninitialized variable. Fixes: ba2ff3027b5a ("ASoC: sunxi: Add support for A23/A33/H3 codec's analog path controls") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-22ASoC: sunxi: Add support for A23/A33/H3 codec's analog path controlsChen-Yu Tsai
The internal codec on A23/A33/H3 is split into 2 parts. The analog path controls are routed through an embedded custom register bus accessed through the PRCM block. The SoCs share a common set of inputs, outputs, and audio paths. The following table lists the differences. ---------------------------------------- | Feature \ SoC | A23 | A33 | H3 | ---------------------------------------- | Headphone | v | v | | ---------------------------------------- | Line Out | | | v | ---------------------------------------- | Phone In/Out | v | v | | ---------------------------------------- Add an ASoC component driver for it. This should be tied to the codec audio card as an auxiliary device. This patch adds the commont paths and controls, and variant specific headphone out and line out. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-10ASoC: sun4i-codec: fix semicolon.cocci warningskbuild test robot
sound/soc/sunxi/sun4i-codec.c:1339:2-3: Unneeded semicolon Remove unneeded semicolon. Generated by: scripts/coccinelle/misc/semicolon.cocci Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-09ASoC: sun4i-codec: Add support for optional reset control to quirksChen-Yu Tsai
The later Allwinner SoCs have a dedicated reset controller, and peripherals have dedicated reset controls which need to be deasserted before the associated peripheral can be used. Add support for this to the quirks structure and probe/remove functions. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-09ASoC: sun4i-codec: Add support for A31 ADC capture pathChen-Yu Tsai
The A31's internal codec capture path has a mixer in front of the ADC for each channel, capable of selecting various inputs, including microphones, line in, phone in, and the main output mixer. This patch adds the various controls, widgets and routes needed for audio capture from the already supported inputs on the A31. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-09ASoC: sunxi: i2s: Implement set_sysclkMaxime Ripard
In our i2s driver, we were previously trying to guess which oversample the user wanted to use by looking at the rate and trying to max it. However, the cards, and especially simple-card with its mclk-fs property will already provide the expected oversample ratio by using the set_sysclk callback. We can thus implement it and remove the logic to deal with the runtime guess. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-04ASoC: sun4i-codec: Add support for A31 board level audio routingChen-Yu Tsai
The A31 SoC's codec has various inputs, outputs and microphone bias supplies. These can be routed on the board in different ways, such as: - HPCOM may be connected to have the headphone DC coupled. - Microphones all use the MBIAS main microphone supply or one mic may use the HBIAS supply, which supports headset detection and buttons. - Line Out may be routed to an audio jack, or an onboard speaker amp with power controls. Add support for specifying the audio routes in the device tree. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-11-04ASoC: sun4i-codec: Add support for A31 analog microphone inputsChen-Yu Tsai
The A31 internal codec has 3 microphone outputs, of which MIC2 and MIC3 are muxed internally. The resulting two microphone inputs have separate gain controls and mixer inputs. The codec also has 2 microphone bias pins. HBIAS is specifically for the headphone jack, which also supports headphone detection and control buttons. These extra functions are not supported yet. The other, MBIAS, is for all other analog microphones. There is also mention of digital microphone support, but documentation is scarce, and no hardware with it is available. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>