linux-kernel - [PATCH 0/2] usb: misc: onboard_usb_hub: add support for XMOS XVF3500

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Date: Tue, 30 Jan 2024 13:26:55 +0100
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Matthias Kaehlcke <mka@...omium.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
 Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH 0/2] usb: misc: onboard_usb_hub: add support for XMOS
 XVF3500

This series adds support for the XMOS XVF3500 VocalFusion Voice
Processor[1], a low-latency, 32-bit multicore controller for voice
processing.

The XVF3500 requires a specific power sequence, which consists of
enabling the regulators that control the 3V3 and 1V0 device supplies,
and a reset de-assertion after a delay of at least 100ns. Once in normal
operation, the XVF3500 registers itself as a regular USB device and no
device-specific management is required.

During a previous attempt to add a specific driver for this device, its
addition to the existing onboard_hub driver was suggested as (possibly)
the simplest solution[2].

The power management provided by onboard_hub is not specific for hubs
and any other USB device with the same power sequence could profit from
that driver, provided that the device does not have any specific
requirements beyond the power management.

The device binding has been added to sound/ because it is the subsystem
that covers its functionality (voice processing) during normal
operation. If it should reside under usb/ instead, it will be moved as
required.

This series has been tested with a Rockchip-based SoC and an XMOS
XVF3500-FB167-C.

[1] https://www.xmos.com/xvf3500/
[2] https://lore.kernel.org/all/aeeb0dfb-87e2-4024-9d4a-0b9529477315@linaro.org/

Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
Javier Carrasco (2):
      ASoC: dt-bindings: xmos,xvf3500: add XMOS XVF3500 voice processor
      usb: misc: onboard_hub: add support for XMOS XVF3500

 .../devicetree/bindings/sound/xmos,xvf3500.yaml    | 51 ++++++++++++++++++++++
 drivers/usb/misc/onboard_usb_hub.c                 |  2 +
 drivers/usb/misc/onboard_usb_hub.h                 |  6 +++
 3 files changed, 59 insertions(+)
---
base-commit: 41bccc98fb7931d63d03f326a746ac4d429c1dd3
change-id: 20240130-onboard_xvf3500-6c0e78d11a1b

Best regards,
-- 
Javier Carrasco <javier.carrasco@...fvision.net>