linux-kernel - Re: [PATCH v14 20/53] ASoC: Add SOC USB APIs for adding an USB backend

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Date: Fri, 09 Feb 2024 11:54:57 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Wesley Cheng <quic_wcheng@...cinc.com>
Cc: <srinivas.kandagatla@...aro.org>,
	<mathias.nyman@...el.com>,
	<perex@...ex.cz>,
	<conor+dt@...nel.org>,
	<corbet@....net>,
	<lgirdwood@...il.com>,
	<andersson@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>,
	<gregkh@...uxfoundation.org>,
	<Thinh.Nguyen@...opsys.com>,
	<broonie@...nel.org>,
	<bgoswami@...cinc.com>,
	<tiwai@...e.com>,
	<robh+dt@...nel.org>,
	<konrad.dybcio@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-sound@...r.kernel.org>,
	<linux-usb@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>,
	<alsa-devel@...a-project.org>
Subject: Re: [PATCH v14 20/53] ASoC: Add SOC USB APIs for adding an USB backend

On Fri, 09 Feb 2024 00:13:33 +0100,
Wesley Cheng wrote:
> 
> Some platforms may have support for offloading USB audio devices to a
> dedicated audio DSP.  Introduce a set of APIs that allow for management of
> USB sound card and PCM devices enumerated by the USB SND class driver.
> This allows for the ASoC components to be aware of what USB devices are
> available for offloading.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
(snip)
> --- a/sound/soc/Makefile
> +++ b/sound/soc/Makefile
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-utils.o soc-dai.o soc-component.o
> +snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-usb.o soc-utils.o soc-dai.o soc-component.o
>  snd-soc-core-objs += soc-pcm.o soc-devres.o soc-ops.o soc-link.o soc-card.o
>  snd-soc-core-$(CONFIG_SND_SOC_COMPRESS) += soc-compress.o

Do we really want to build this into ASoC core unconditionally?
This is very specific to Qualcomm USB-offload stuff, so it's better to
factor out.


thanks,

Takashi