This series makes use of the additional DAIs recently added to the sun8i-codec driver to add hardware routing for BT SCO (headset) audio on the PinePhone.
The BT audio connection is represented by the "dummy" bt-sco codec. The connection to the Quectel EG-25G modem via AIF2 works as well, but I do not include it here because there is no appropriate codec driver in tree. We have been using an out-of-tree "dummy" codec driver similar to bt-sco, and I'm not sure if such a driver would be desired upstream.
The modem has a similar amount of configurability as the rtl8723cs BT chip. For the BT chip, the DAI format and PCM parameters are set in a configuration firmware file and loaded at driver load time. For the modem, the DAI format and PCM parameters are set by (and can be queried from) an AT command. However, this AT command requires a modem restart to take effect, so the parameters cannot feasibly be changed at runtime.
With a dummy driver, we pick some "standard" set of PCM parameters, e.g. 16 bit mono at 8 or 16 kHz, and assume the hardware agrees. Similarly, we assume the DAI format pre-programmed in the remote hardware matches what is configured in the DAI link (in this case, in the device tree).
Is that the right way to model this? Or does the modem (and maybe even the BT chip) deserve a more featureful driver that reads and/or programs the format and params at probe time?
Because of those unanswered questions, I'm sending BT SCO support first/only.
Regards, Samuel
Arnaud Ferraris (1): arm64: dts: allwinner: pinephone: Set audio card name
Samuel Holland (6): ASoC: dt-bindings: sun8i-codec: Increase #sound-dai-cells ARM: dts: sun8i-a33: Allow using multiple codec DAIs arm64: dts: allwinner: a64: Allow using multiple codec DAIs arm64: dts: allwinner: a64: Add pinmux nodes for AIF2/AIF3 arm64: dts: allwinner: a64: Allow multiple DAI links arm64: dts: allwinner: pinephone: Add support for Bluetooth audio
.../sound/allwinner,sun8i-a33-codec.yaml | 2 +- arch/arm/boot/dts/sun8i-a33.dtsi | 4 +- .../dts/allwinner/sun50i-a64-pinephone.dtsi | 25 +++++++++++++ arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 37 ++++++++++++++----- 4 files changed, 55 insertions(+), 13 deletions(-)