linux-kernel - Re: [PATCH v10 2/2] usb: dwc3: Add Google Tensor SoC DWC3 glue driver

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Message-ID: <20251220005742.tmir3mpadnwe5rtr@synopsys.com>
Date: Sat, 20 Dec 2025 00:57:53 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Roy Luo <royluo@...gle.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Peter Griffin <peter.griffin@...aro.org>,
        André Draszik <andre.draszik@...aro.org>,
        Tudor Ambarus <tudor.ambarus@...aro.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Doug Anderson <dianders@...gle.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" <linux-samsung-soc@...r.kernel.org>,
        Joy Chakraborty <joychakr@...gle.com>,
        Naveen Kumar <mnkumar@...gle.com>
Subject: Re: [PATCH v10 2/2] usb: dwc3: Add Google Tensor SoC DWC3 glue driver

On Thu, Dec 18, 2025, Roy Luo wrote:
> Add support for the DWC3 USB controller found on Google Tensor G5
> (codename: laguna). The controller features dual-role functionality
> and hibernation.
> 
> The primary focus is implementing hibernation support in host mode,
> enabling the controller to enter a low-power state (D3). This is
> particularly relevant during system power state transition and
> runtime power management for power efficiency.
> Highlights:
> - Align suspend callback with dwc3_suspend_common() for deciding
>   between a full teardown and hibernation in host mode.
> - Integration with `psw` (power switchable) and `top` power domains,
>   managing their states and device links to support hibernation.
> - A notifier callback dwc3_google_usb_psw_pd_notifier() for
>   `psw` power domain events to manage controller state
>   transitions to/from D3.
> - Coordination of the `non_sticky` reset during power state
>   transitions, asserting it on D3 entry and deasserting on D0 entry
>   in hibernation scenario.
> - Handling of high-speed and super-speed PME interrupts
>   that are generated by remote wakeup during hibernation.
> 
> Co-developed-by: Joy Chakraborty <joychakr@...gle.com>
> Signed-off-by: Joy Chakraborty <joychakr@...gle.com>
> Co-developed-by: Naveen Kumar <mnkumar@...gle.com>
> Signed-off-by: Naveen Kumar <mnkumar@...gle.com>
> Reviewed-by: Peter Griffin <peter.griffin@...aro.org>
> Signed-off-by: Roy Luo <royluo@...gle.com>
> ---
>  MAINTAINERS                    |   1 +
>  drivers/usb/dwc3/Kconfig       |  11 +
>  drivers/usb/dwc3/Makefile      |   1 +
>  drivers/usb/dwc3/dwc3-google.c | 628 +++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 641 insertions(+)
> 

Acked-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

BR,
Thinh