linux-kernel - Re: [PATCH v5 8/8] usb: misc: onboard

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Message-ID: <Zd-H6hVPv1poXoa1@google.com>
Date: Wed, 28 Feb 2024 19:22:18 +0000
From: Matthias Kaehlcke <mka@...omium.org>
To: Javier Carrasco <javier.carrasco@...fvision.net>
Cc: 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>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Helen Koike <helen.koike@...labora.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Russell King <linux@...linux.org.uk>,
	linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 8/8] usb: misc: onboard_hub: add support for XMOS
 XVF3500

On Wed, Feb 28, 2024 at 02:51:35PM +0100, Javier Carrasco wrote:
> The XMOS XVF3500 VocalFusion Voice Processor[1] is a low-latency, 32-bit
> multicore controller for voice processing.
> 
> This device 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. Such power
> sequence is already supported by the onboard_hub driver, and it can be
> reused for non-hub USB devices as well.

Please update the commit message, the onboard_hub driver no longer
exists as such with the other patches of this series.

> Once in normal operation, the XVF3500 registers itself as a USB device,
> and it does not require any device-specific operations in the driver.
> 
> [1] https://www.xmos.com/xvf3500/
> 
> Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>

Acked-by: Matthias Kaehlcke <mka@...omium.org>

> ---
>  drivers/usb/misc/onboard_usb_dev.c | 2 ++
>  drivers/usb/misc/onboard_usb_dev.h | 8 ++++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/usb/misc/onboard_usb_dev.c b/drivers/usb/misc/onboard_usb_dev.c
> index df0ed172c7ec..50f84c5278a2 100644
> --- a/drivers/usb/misc/onboard_usb_dev.c
> +++ b/drivers/usb/misc/onboard_usb_dev.c
> @@ -405,6 +405,7 @@ static struct platform_driver onboard_dev_driver = {
>  #define VENDOR_ID_REALTEK	0x0bda
>  #define VENDOR_ID_TI		0x0451
>  #define VENDOR_ID_VIA		0x2109
> +#define VENDOR_ID_XMOS		0x20B1
>  
>  /*
>   * Returns the onboard_dev platform device that is associated with the USB
> @@ -497,6 +498,7 @@ static const struct usb_device_id onboard_dev_id_table[] = {
>  	{ USB_DEVICE(VENDOR_ID_TI, 0x8142) }, /* TI USB8041 2.0 */
>  	{ USB_DEVICE(VENDOR_ID_VIA, 0x0817) }, /* VIA VL817 3.1 */
>  	{ USB_DEVICE(VENDOR_ID_VIA, 0x2817) }, /* VIA VL817 2.0 */
> +	{ USB_DEVICE(VENDOR_ID_XMOS, 0x0013) }, /* XVF3500 */

nit: be a bit more specific? e.g. XVF3500 Voice Processor, or XMOS XVF3500

The other entries were implicitly hubs since this was the 'onboard_hub'
driver. It wouldn't be a bad idea to add 'hub' to these entries in the
patch that 'renames' the driver.