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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Matthias Kaehlcke <mka@chromium.org>
Cc: Alan Stern <stern@rowland.harvard.edu>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Mathias Nyman <mathias.nyman@intel.com>,
	Michal Simek <michal.simek@xilinx.com>,
	Ravi Chandra Sadineni <ravisadineni@chromium.org>,
	linux-usb@vger.kernel.org, Bastien Nocera <hadess@hadess.net>,
	linux-kernel@vger.kernel.org,
	Krzysztof Kozlowski <krzk@kernel.org>,
	devicetree@vger.kernel.org, Peter Chen <peter.chen@kernel.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Douglas Anderson <dianders@chromium.org>,
	Al Cooper <alcooperx@gmail.com>,
	"Alexander A. Klimov" <grandmaster@al2klimov.de>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Colin Ian King <colin.king@canonical.com>,
	Dmitry Osipenko <digetx@gmail.com>,
	Fabio Estevam <festevam@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v11 0/5] USB: misc: Add onboard_usb_hub driver
Date: Sat, 5 Jun 2021 09:01:52 +0200	[thread overview]
Message-ID: <YLshYLa8dh6Fme4P@kroah.com> (raw)
In-Reply-To: <20210604214101.3363525-1-mka@chromium.org>

On Fri, Jun 04, 2021 at 02:40:56PM -0700, Matthias Kaehlcke wrote:
> This series adds:
> - the onboard_usb_hub_driver
> - glue in the xhci-plat driver to create and destroy the
>   onboard_usb_hub platform devices if needed
> - a device tree binding for the Realtek RTS5411 USB hub controller
> - device tree changes that add RTS5411 entries for the QCA SC7180
>   based boards trogdor and lazor
> - a couple of stubs for platform device functions to avoid
>   unresolved symbols with certain kernel configs
> 
> The main issue the driver addresses is that a USB hub needs to be
> powered before it can be discovered. For discrete onboard hubs (an
> example for such a hub is the Realtek RTS5411) this is often solved
> by supplying the hub with an 'always-on' regulator, which is kind
> of a hack. Some onboard hubs may require further initialization
> steps, like changing the state of a GPIO or enabling a clock, which
> requires even more hacks. This driver creates a platform device
> representing the hub which performs the necessary initialization.
> Currently it only supports switching on a single regulator, support
> for multiple regulators or other actions can be added as needed.
> Different initialization sequences can be supported based on the
> compatible string.
> 
> Besides performing the initialization the driver can be configured
> to power the hub off during system suspend. This can help to extend
> battery life on battery powered devices which have no requirements
> to keep the hub powered during suspend. The driver can also be
> configured to leave the hub powered when a wakeup capable USB device
> is connected when suspending, and power it off otherwise.
> 
> Changes in v11:
> - support multiple onboard hubs connected to the same parent
> - don't include ‘onboard_hub.h’ from the onboard hub driver

There's still build warnings found by 0-day :(

      parent reply	other threads:[~2021-06-05  7:01 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 21:40 [PATCH v11 0/5] USB: misc: Add onboard_usb_hub driver Matthias Kaehlcke
2021-06-04 21:40 ` [PATCH v11 1/5] dt-bindings: usb: Add binding for Realtek RTS5411 hub controller Matthias Kaehlcke
2021-06-04 21:40 ` [PATCH v11 2/5] USB: misc: Add onboard_usb_hub driver Matthias Kaehlcke
2021-06-04 23:18   ` kernel test robot
2021-06-07 17:51     ` Matthias Kaehlcke
2021-06-07 18:23       ` Greg Kroah-Hartman
2021-06-07 18:32         ` Matthias Kaehlcke
2021-06-08  8:56           ` Greg Kroah-Hartman
2021-06-08 20:54             ` Matthias Kaehlcke
2021-06-09  4:47               ` Greg Kroah-Hartman
2021-06-04 21:40 ` [PATCH v11 3/5] of/platform: Add stubs for of_platform_device_create/destroy() Matthias Kaehlcke
2021-06-04 21:41 ` [PATCH v11 4/5] usb: host: xhci-plat: Create platform device for onboard hubs in probe() Matthias Kaehlcke
2021-06-04 21:41 ` [PATCH v11 5/5] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub Matthias Kaehlcke
2021-06-05  7:01 ` Greg Kroah-Hartman [this message]

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