- 27 Oct, 2021 4 commits
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Pierre-Louis Bossart authored
We have configurations for this codec on APL, GLK and TGL, somehow the information that some designs rely on JasperLake was not shared. BugLink: https://github.com/thesofproject/linux/issues/3210 Fixes: 790049fb ('ASoC: Intel: soc-acpi: apl/glk/tgl: add entry for devices based on ES8336 codec') Signed-off-by:
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by:
Kai Vehmanen <kai.vehmanen@intel.com> Signed-off-by:
Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20211027023311.25005-1-yung-chuan.liao@linux.intel.comSigned-off-by:
Mark Brown <broonie@kernel.org>
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Yang Yingliang authored
In case of error, platform_device_register_data() returns ERR_PTR() and never returns NULL. The NULL test in the return value check should be replaced with IS_ERR(). Reported-by:
Hulk Robot <hulkci@huawei.com> Fixes: e646b51f ("ASoC: amd: acp: Add callback for machine driver on ACP") Signed-off-by:
Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20211027065228.833825-1-yangyingliang@huawei.comSigned-off-by:
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George Song authored
add max98520 audio amplifier driver Signed-off-by:
George Song <george.song@maximintegrated.com> Link: https://lore.kernel.org/r/20211027001431.363-2-george.song@maximintegrated.comSigned-off-by:
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George Song authored
add initial bindings for max98520 audio amplifier Signed-off-by:
Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20211027001431.363-1-george.song@maximintegrated.comSigned-off-by:
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- 26 Oct, 2021 31 commits
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Mark Brown authored
Merge series "ASoC: cs42l42: Fixes to power-down" from Richard Fitzgerald <rf@opensource.cirrus.com>: Driver probe and remove were inconsistent in what they did to power-down and neither did all steps. In addition to that, neither function prevented the interrupt handler from running during and after power-down. Richard Fitzgerald (2): ASoC: cs42l42: Reset and power-down on remove() and failed probe() ASoC: cs42l42: free_irq() before powering-down on probe() fail sound/soc/codecs/cs42l42.c | 43 +++++++++++++++++++++++++++++++------------ 1 file changed, 31 insertions(+), 12 deletions(-) -- 2.11.0
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Mark Brown authored
Merge series "Update Lpass digital codec macro drivers" from Srinivasa Rao Mandadapu <srivasam@codeaurora.org>: This patch set is to add support for lpass sc7280 based targets. Upadate compatible name and change of bulk clock voting to optional clock voting in digital codecs va, rx, tx macro drivers. Changes Since V3: -- Removed fixes tag. -- Change signedoff by sequence. Changes Since V2: -- Add Tx macro deafults for lpass sc7280 Changes Since V1: -- Removed individual clock voting and used bulk clock optional. -- Removed volatile changes and fixed default values. -- Typo errors. Srinivasa Rao Mandadapu (5): ASoC: qcom: Add compatible names in va,wsa,rx,tx codec drivers for sc7280 ASoC: qcom: dt-bindings: Add compatible names for lpass sc7280 digital codecs ASoC: codecs: tx-macro: Enable tx top soundwire mic clock ASoC: codecs: tx-macro: Update tx default values ASoC: codecs: Change bulk clock voting to optional voting in digital codecs .../bindings/sound/qcom,lpass-rx-macro.yaml | 4 +++- .../bindings/sound/qcom,lpass-tx-macro.yaml | 4 +++- .../bindings/sound/qcom,lpass-va-macro.yaml | 4 +++- .../bindings/sound/qcom,lpass-wsa-macro.yaml | 4 +++- sound/soc/codecs/lpass-rx-macro.c | 3 ++- sound/soc/codecs/lpass-tx-macro.c | 25 +++++++++++++++++++--- sound/soc/codecs/lpass-va-macro.c | 3 ++- sound/soc/codecs/lpass-wsa-macro.c | 1 + 8 files changed, 39 insertions(+), 9 deletions(-) -- Qualcomm India Private Limited, on behalf of Qualcomm Innovation Center, Inc., is a member of Code Aurora Forum, a Linux Foundation Collaborative Project. -
Mark Brown authored
Merge series "ASoC: qcom: Add AudioReach support" from Srinivas Kandagatla <srinivas.kandagatla@linaro.org>: Hi Mark, This version is a respin of v10 fixing a build error in 12/17 patch. QCOM SoC relevant non-audio patches in this series has been merged into the Qualcomm drivers-for-5.16 tree, as this series depends those patches an immutable tag is available at: https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git tags/20210927135559.738-6-srinivas.kandagatla@linaro.org This patchset adds ASoC driver support to configure signal processing framework ("AudioReach") which is integral part of Qualcomm next generation audio SDK and will be deployed on upcoming Qualcomm chipsets. It makes use of ASoC Topology to load graphs on to the DSP which is then managed by APM (Audio Processing Manager) service to prepare/start/stop. Here is simplified high-level block diagram of AudioReach: ___________________________________________________________ | CPU (Application Processor) | | +---------+ +---------+ +----------+ | | | q6apm | | q6apm | | q6apm | | | | dais | <------> | | <-----> |lpass-dais| | | +---------+ +---------+ +----------+ | | ^ ^ | | | | +---------+ | | +---------+ v +---------->|topology | | | | q6prm | +---------+ | | | | | |<-------->| GPR | +---------+ | | +---------+ +---------+ | | ^ ^ | | | | | | +----------+ | | | | q6prm | | | | |lpass-clks| | | | +----------+ | | |____________________________|______________________________| | | RPMSG (IPC over GLINK) ____________________________|______________________________ | | | | +-----------------------+ | | | | | | v v q6 (Audio DSP) | |+-----+ +----------------------------------+ | || PRM | | APM (Audio Processing Manager) | | |+-----+ | . Graph Management | | | | . Command Handing | | | | . Event Management | | | | ... | | | +----------------------------------+ | | ^ | |____________________________|______________________________| | | LPASS AIF ____________________________|______________________________ | | Audio I/O | | v | | +--------------------------------------------------+ | | | Audio devices | | | | CODEC | HDMI-TX | PCM | SLIMBUS | I2S |MI2S |...| | | | | | | +--------------------------------------------------+ | |___________________________________________________________| AudioReach has constructs of sub-graph, container and modules. Each sub-graph can have N containers and each Container can have N Modules and connections between them can be linear or non-linear. An audio function can be realized with one or many connected sub-graphs. There are also control/event paths between modules that can be wired up while building graph to achieve various control mechanism between modules. These concepts of Sub-Graph, Containers and Modules are represented in ASoC topology. Here is simple I2S graph with a Write Shared Memory and a Volume control module within a single Subgraph (1) with one Container (1) and 5 modules. ____________________________________________________________ | Sub-Graph [1] | | _______________________________________________________ | | | Container [1] | | | | [WR_SH] -> [PCM DEC] -> [PCM CONV] -> [VOL]-> [I2S-EP]| | | |_______________________________________________________| | |____________________________________________________________| For now this graph is split into two subgraphs to achieve dpcm like below: ________________________________________________ _________________ | Sub-Graph [1] | | Sub-Graph [2] | | ____________________________________________ | | _____________ | | | Container [1] | | | |Container [2]| | | | [WR_SH] -> [PCM DEC] -> [PCM CONV] -> [VOL]| | | | [I2S-EP] | | | |____________________________________________| | | |_____________| | |________________________________________________| |_________________| _________________ | Sub-Graph [3] | | _____________ | | |Container [3]| | | | [DMA-EP] | | | |_____________| | |_________________| This patchset adds very minimal support for AudioReach which includes supporting sub-graphs containing CODEC DMA ports and simple PCM Decoder/Encoder and Logger Modules. Additional capabilities will be built over time to expose features offered by AudioReach. This patchset is Tested on SM8250 SoC based Qualcomm Robotics Platform RB5 and SM9250 MTP with WSA881X Smart Speaker Amplifiers, DMICs connected via VA Macro and WCD938x Codec connected via TX and RX Macro and HDMI audio via I2S. First 10 Patches are mostly reorganization existing Old QDSP Audio Framework code and bindings so that we could reuse them on AudioReach. ASoC topology graphs for DragonBoard RB5 and SM8250 MTP are available at https://git.linaro.org/people/srinivas.kandagatla/audioreach-topology.git/ and Qualcomm AudioReach DSP headers are available at: https://source.codeaurora.org/quic/la/platform/vendor/opensource/arspf-headers Note: There is one false positive warning in this patchset: audioreach.c:80:45: warning: array of flexible structures Thanks, srini Changes since v10: - fix build error during arm64 defconfig build reported by Mark in 12/17 patch for audioreach_tplg_init symbol Srinivas Kandagatla (17): ASoC: dt-bindings: move LPASS dai related bindings out of q6afe ASoC: dt-bindings: move LPASS clocks related bindings out of q6afe ASoC: dt-bindings: rename q6afe.h to q6dsp-lpass-ports.h ASoC: qdsp6: q6afe-dai: move lpass audio ports to common file ASoC: qdsp6: q6afe-clocks: move audio-clocks to common file ASoC: dt-bindings: q6dsp: add q6apm-lpass-dai compatible ASoC: dt-bindings: lpass-clocks: add q6prm clocks compatible ASoC: dt-bindings: add q6apm digital audio stream bindings ASoC: qdsp6: audioreach: add basic pkt alloc support ASoC: qdsp6: audioreach: add q6apm support ASoC: qdsp6: audioreach: add module configuration command helpers ASoC: qdsp6: audioreach: add Kconfig and Makefile ASoC: qdsp6: audioreach: add topology support ASoC: qdsp6: audioreach: add q6apm-dai support ASoC: qdsp6: audioreach: add q6apm lpass dai support ASoC: qdsp6: audioreach: add q6prm support ASoC: qdsp6: audioreach: add support for q6prm-clocks .../devicetree/bindings/sound/qcom,q6afe.txt | 181 --- .../bindings/sound/qcom,q6apm-dai.yaml | 53 + .../sound/qcom,q6dsp-lpass-clocks.yaml | 77 ++ .../sound/qcom,q6dsp-lpass-ports.yaml | 205 +++ include/dt-bindings/sound/qcom,q6afe.h | 203 +-- .../sound/qcom,q6dsp-lpass-ports.h | 208 +++ include/uapi/sound/snd_ar_tokens.h | 208 +++ sound/soc/qcom/Kconfig | 22 + sound/soc/qcom/qdsp6/Makefile | 11 +- sound/soc/qcom/qdsp6/audioreach.c | 1130 +++++++++++++++++ sound/soc/qcom/qdsp6/audioreach.h | 726 +++++++++++ sound/soc/qcom/qdsp6/q6afe-clocks.c | 187 +-- sound/soc/qcom/qdsp6/q6afe-dai.c | 687 +--------- sound/soc/qcom/qdsp6/q6apm-dai.c | 416 ++++++ sound/soc/qcom/qdsp6/q6apm-lpass-dais.c | 260 ++++ sound/soc/qcom/qdsp6/q6apm.c | 822 ++++++++++++ sound/soc/qcom/qdsp6/q6apm.h | 152 +++ sound/soc/qcom/qdsp6/q6dsp-lpass-clocks.c | 186 +++ sound/soc/qcom/qdsp6/q6dsp-lpass-clocks.h | 30 + sound/soc/qcom/qdsp6/q6dsp-lpass-ports.c | 627 +++++++++ sound/soc/qcom/qdsp6/q6dsp-lpass-ports.h | 22 + sound/soc/qcom/qdsp6/q6prm-clocks.c | 85 ++ sound/soc/qcom/qdsp6/q6prm.c | 202 +++ sound/soc/qcom/qdsp6/q6prm.h | 78 ++ sound/soc/qcom/qdsp6/topology.c | 1113 ++++++++++++++++ 25 files changed, 6664 insertions(+), 1227 deletions(-) create mode 100644 Documentation/devicetree/bindings/sound/qcom,q6apm-dai.yaml create mode 100644 Documentation/devicetree/bindings/sound/qcom,q6dsp-lpass-clocks.yaml create mode 100644 Documentation/devicetree/bindings/sound/qcom,q6dsp-lpass-ports.yaml create mode 100644 include/dt-bindings/sound/qcom,q6dsp-lpass-ports.h create mode 100644 include/uapi/sound/snd_ar_tokens.h create mode 100644 sound/soc/qcom/qdsp6/audioreach.c create mode 100644 sound/soc/qcom/qdsp6/audioreach.h create mode 100644 sound/soc/qcom/qdsp6/q6apm-dai.c create mode 100644 sound/soc/qcom/qdsp6/q6apm-lpass-dais.c create mode 100644 sound/soc/qcom/qdsp6/q6apm.c create mode 100644 sound/soc/qcom/qdsp6/q6apm.h create mode 100644 sound/soc/qcom/qdsp6/q6dsp-lpass-clocks.c create mode 100644 sound/soc/qcom/qdsp6/q6dsp-lpass-clocks.h create mode 100644 sound/soc/qcom/qdsp6/q6dsp-lpass-ports.c create mode 100644 sound/soc/qcom/qdsp6/q6dsp-lpass-ports.h create mode 100644 sound/soc/qcom/qdsp6/q6prm-clocks.c create mode 100644 sound/soc/qcom/qdsp6/q6prm.c create mode 100644 sound/soc/qcom/qdsp6/q6prm.h create mode 100644 sound/soc/qcom/qdsp6/topology.c -- 2.21.0
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Geert Uytterhoeven authored
All configuration symbols for AMD Audio ACP conponents depend on X86 && PCI, except for SND_SOC_AMD_ACP_COMMON. Add a dependency on X86 && PCI to SND_SOC_AMD_ACP_COMMON, to prevent asking the user about AMD Audio ACP support when configuring a kernel without X86 or PCI support. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/30fcedce513186bf89f1f2655b665298250fdc66.1635260849.git.geert+renesas@glider.beSigned-off-by:
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Geert Uytterhoeven authored
If not all of CONFIG_X86, CONFIG_PCI, and CONFIG_I2C are set: WARNING: unmet direct dependencies detected for SND_SOC_AMD_MACH_COMMON Depends on [n]: SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] && X86 && PCI [=y] && I2C [=y] Selected by [y]: - SND_SOC_AMD_LEGACY_MACH [=y] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] - SND_SOC_AMD_SOF_MACH [=y] && SOUND [=y] && !UML && SND [=y] && SND_SOC [=y] As SND_SOC_AMD_MACH_COMMON depends on X86 && PCI && I2C, all symbols selecting it should depend on X86 && PCI && I2C, too. Fixes: 9d8a7be8 ("ASoC: amd: acp: Add legacy sound card support for Chrome audio") Fixes: 9f84940f ("ASoC: amd: acp: Add SOF audio support on Chrome board") Signed-off-by: -
Geert Uytterhoeven authored
The build only descends into sound/soc/amd/acp/ if CONFIG_SND_SOC_AMD_ACP_COMMON=y. Hence all later config symbols should depend on SND_SOC_AMD_ACP_COMMON, to prevent asking the user about config symbols for driver code that won't be build anyway. Fixes: 623621a9 ("ASoC: amd: Add common framework to support I2S on ACP SOC") Signed-off-by:
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Richard Fitzgerald authored
Relying on devm to free the irq handler on probe failure leaves a small window of opportunity for an interrupt to become pending and then the handler to run after the chip has been reset and powered off. For safety cs42l42_probe() should free the irq in the error path. As the irq is now disabled by the driver in probe() and remove() there is no point allocating it as a devres-managed item, so convert to plain non-devres. Signed-off-by:
Richard Fitzgerald <rf@opensource.cirrus.com> Link: https://lore.kernel.org/r/20211026125722.10220-3-rf@opensource.cirrus.comSigned-off-by:
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Richard Fitzgerald authored
Driver remove() should assert RESET and disable the supplies. probe() fail was disabling supplies but it didn't assert reset or put the codec into a power-down state. Signed-off-by:
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Srinivas Kandagatla authored
Add q6prm clocks using existing qdsp6-audio-clock driver Signed-off-by:
Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Reviewed-by:
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Srinivas Kandagatla authored
Add support to q6prm (Proxy Resource Manager) module used for clock resources Signed-off-by:
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Srinivas Kandagatla authored
Add support to Audio port dais on LPASS Audio IP using existing common q6dsp-lpass-ports. Signed-off-by:
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Srinivas Kandagatla authored
Add support to pcm dais in Audio Process Manager. Signed-off-by:
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Srinivas Kandagatla authored
Add ASoC topology support in audioreach Signed-off-by:
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Srinivas Kandagatla authored
Now that all the code for audioreach and q6apm are in at this point to be able to compile, start adding Kconfig and Makefile changes. Signed-off-by:
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Srinivas Kandagatla authored
Audioreach module configuration helpers, which will be used by the q6apm-dai driver. Signed-off-by:
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Srinivas Kandagatla authored
Add support to q6apm (Audio Process Manager) component which is core Audioreach service running in the DSP. Signed-off-by:
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Srinivas Kandagatla authored
Add basic helper functions for AudioReach. Signed-off-by:
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Srinivas Kandagatla authored
On AudioReach audio Framework, Audio Streams (PCM/Compressed) are managed by Q6APM(Audio Process Manager) service. This patch adds bindings for this DAIs exposed by the DSP. Signed-off-by:
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Srinivas Kandagatla authored
On AudioReach audio Framework access to LPASS ports is via Q6PRM (Proxy Resource Manager) service, so add a dedicated lpass-clock compatible string for this. Signed-off-by:
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Srinivas Kandagatla authored
on AudioReach audio Framework access to LPASS ports is via Q6APM(Audio Process Manager) service, so add a dedicated compatible string for this. Signed-off-by:
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Srinivas Kandagatla authored
Move common parts of q6afe-clocks to q6dsp-lpass-clocks so that we could reuse most of the driver for new Q6DSP audio frameworks. This is to make the code reuseable for new Q6DSP AudioReach framework. Signed-off-by:
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Srinivas Kandagatla authored
Various Q6DSP frameworks will use LPASS Audio IP, so move all the hardware specific details to a common file so that they could be reused across multiple Q6DSP frameworks. In this case all the audio ports definitions can be moved to a common file to be able to reuse across multiple Q6DSP frameworks. Signed-off-by:
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Srinivas Kandagatla authored
move all LPASS audio ports defines from q6afe.h to q6dsp-lpass-ports.h as these belong to LPASS IP. Also this move helps in reusing this header across multiple audio frameworks on Qualcomm Audio DSP. This patch is split out of the dt-bindings patch to enable easy review. Signed-off-by:
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Srinivas Kandagatla authored
q6afe (Audio Front End) is one of the DSP service that handles both LPASS (Low Power Audio SubSystem) Audio ports and LPASS clocks. As LPASS is a hardwware IP and commonly used by Qualcomm Audio DSP. In order to allow multiple DSP frameworks to use these bindings its best to move it out from the dsp specific bindings. For compatibility reasons and not breaking which is already working we still maintain same compatible string "qcom,q6afe-clocks" Also as part of this change convert these LPASS clocks related bindings into yaml format. Signed-off-by:
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Srinivas Kandagatla authored
q6afe (Audio Front End) is one of the DSP service that handles both LPASS (Low Power Audio SubSystem) Audio ports and LPASS clocks. As LPASS is a hardwware IP and commonly used by Qualcomm Audio DSP. In order to allow multiple DSP frameworks to use these bindings its best to move it out from the dsp specific bindings. For compatibility reasons and not breaking which is already working we still maintain same compatible string "qcom,q6afe-dais" Also as part of this change convert these LPASS dai related bindings into yaml format. Signed-off-by:
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Mark Brown authored
Merge tag '20210927135559.738-6-srinivas.kandagatla@linaro.org' of https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux into v11_20211026_srinivas_kandagatla_asoc_qcom_add_audioreach_support for audioreach support v5.15-rc1 + 20210927135559.738-[23456]-srinivas.kandagatla@linaro.org This immutable branch is based on v5.15-rc1 and contains the following patches extending the existig APR driver to also implement GPR: 20210927135559.738-2-srinivas.kandagatla@linaro.org 20210927135559.738-3-srinivas.kandagatla@linaro.org 20210927135559.738-4-srinivas.kandagatla@linaro.org 20210927135559.738-5-srinivas.kandagatla@linaro.org 20210927135559.738-6-srinivas.kandagatla@linaro.org
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Srinivasa Rao Mandadapu authored
Change bulk clock frequency voting to optional bulk voting in va, rx and tx macros to accommodate both ADSP and ADSP bypass based lpass architectures. Signed-off-by:
Srinivasa Rao Mandadapu <srivasam@codeaurora.org> Co-developed-by:
Venkata Prasad Potturu <potturu@codeaurora.org> Signed-off-by:
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Srinivasa Rao Mandadapu authored
Update mic control register default values to hardware reset values lpass sc7280. Signed-off-by:
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Srinivasa Rao Mandadapu authored
Enable tx path soundwire mic0 and mic1 clock. Signed-off-by:
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Srinivasa Rao Mandadapu authored
Update compatible names in va, wsa, rx and tx macro codes for lpass sc7280 Signed-off-by:
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Srinivasa Rao Mandadapu authored
Add compatible names for sc7280 based targets in digital codec drivers va,wsa,rx and tx. Signed-off-by:
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- 25 Oct, 2021 5 commits
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Mark Brown authored
When removing the index argument from snd_soc_topology_component_remove() commit a5b8f71c (ASoC: topology: Remove multistep topology loading) forgot to update the stub for !SND_SOC_TOPOLOGY use, causing build failures for anything that tries to make use of it. Fixes: a5b8f71c (ASoC: topology: Remove multistep topology loading) Signed-off-by:
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Stephan Gerhold authored
At the moment, the DAI link nodes in the device tree always have to be specified completely in each device tree. However, the available interfaces (e.g. Primary/Secondary/Tertiary/Quaternary MI2S) are common for all devices of a SoC, so the majority of the definitions can be placed in a common device tree include to reduce boilerplate. Make it possible to define such stubs in device tree includes by respecting the "status" property for the DAI link nodes. This is a trivial change that just requires switching to the _available_ OF functions that check the "status" property additionally. This allows defining a stub like: sound_dai_quaternary: dai-link-quaternary { link-name = "Quaternary MI2S"; status = "disabled"; /* Needs extra codec configuration */ cpu { sound-dai = <&q6afedai QUATERNARY_MI2S_RX>; }; platform { sound-dai = <&q6routing>; }; }; where the codec would be filled in by the device-specific device tree. For existing device trees this change does not make any difference. A missing "status" property is treated like status = "okay". Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by:Stephan Gerhold <stephan@gerhold.net> Reviewed-by:
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Srinivasa Rao Mandadapu authored
Add header defining for lpass internal digital codecs rx,tx and va dai node id's. Signed-off-by:
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Mark Brown authored
Merge series "ASoC: wm8962: Conversion to json-schema and fix" from Geert Uytterhoeven <geert+renesas@glider.be>: Hi all, This patch series converts the Wolfson WM8962 Device Tree binding documentation to json-schema, after fixing an issue in the imx8mn-beacon DTS file. Thanks for your comments! Geert Uytterhoeven (2): arm64: dts: imx: imx8mn-beacon: Drop undocumented clock-names reference ASoC: dt-bindings: wlf,wm8962: Convert to json-schema .../devicetree/bindings/sound/wlf,wm8962.yaml | 118 ++++++++++++++++++ .../devicetree/bindings/sound/wm8962.txt | 43 ------- .../freescale/imx8mn-beacon-baseboard.dtsi | 1 - 3 files changed, 118 insertions(+), 44 deletions(-) create mode 100644 Documentation/devicetree/bindings/sound/wlf,wm8962.yaml delete mode 100644 Documentation/devicetree/bindings/sound/wm8962.txt -- 2.25.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -
Geert Uytterhoeven authored
Convert the Wolfson WM8962 Ultra-Low Power Stereo CODEC Device Tree binding documentation to json-schema. Add missing *-supply and port properties. Update the example. Signed-off-by:
Charles Keepax <ckeepax@opensource.cirrus.com> Reviewed-by:
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