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From: Matthias Kaehlcke <mka@chromium.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Alan Stern <stern@rowland.harvard.edu>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Michal Simek <michal.simek@xilinx.com>,
	devicetree@vger.kernel.org,
	Douglas Anderson <dianders@chromium.org>,
	linux-usb@vger.kernel.org, Peter Chen <peter.chen@kernel.org>,
	linux-kernel@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
	Ravi Chandra Sadineni <ravisadineni@chromium.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Bastien Nocera <hadess@hadess.net>,
	Al Cooper <alcooperx@gmail.com>,
	"Alexander A. Klimov" <grandmaster@al2klimov.de>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Christian Lamparter <chunkeey@googlemail.com>,
	Colin Ian King <colin.king@canonical.com>,
	Dmitry Osipenko <digetx@gmail.com>,
	Fabio Estevam <festevam@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Mathias Nyman <mathias.nyman@intel.com>,
	Vinod Koul <vkoul@kernel.org>,
	linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver
Date: Tue, 25 May 2021 10:42:25 -0700	[thread overview]
Message-ID: <YK03AVRfbRJUGd0X@google.com> (raw)
In-Reply-To: <YKen70owPqdjy5+a@kroah.com>

On Fri, May 21, 2021 at 02:30:39PM +0200, Greg Kroah-Hartman wrote:
> On Tue, May 11, 2021 at 03:52:18PM -0700, Matthias Kaehlcke wrote:
> > This series adds:
> > - the onboard_usb_hub_driver
> > - glue in the xhci-plat driver to create the onboard_usb_hub
> >   platform device 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.
> 
> I get a build error when I apply this series to my tree:
> 
> drivers/usb/misc/onboard_usb_hub.c:273:6: error: redefinition of ‘of_is_onboard_usb_hub’
>   273 | bool of_is_onboard_usb_hub(const struct device_node *np)
>       |      ^~~~~~~~~~~~~~~~~~~~~
> In file included from drivers/usb/misc/onboard_usb_hub.c:21:
> ./include/linux/usb/onboard_hub.h:9:20: note: previous definition of ‘of_is_onboard_usb_hub’ with type ‘bool(const struct device_node *)’ {aka ‘_Bool(const struct device_node *)’}
>     9 | static inline bool of_is_onboard_usb_hub(const struct device_node *np)
>       |                    ^~~~~~~~~~~~~~~~~~~~~
> 
> Any thoughts?

That function keeps haunting me in different ways ...

I suspect this was a build with CONFIG_COMPILE_TEST=y. The driver is
compiled for such a config and has the actual implementation, however
the header defines the static inline unless CONFIG_USB_ONBOARD_HUB=y/m.

I realized earlier that the driver doesn't really need to include the
header, and planned to remove it in the next version, which might be
the most practical solution.

      reply	other threads:[~2021-05-25 17:42 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-11 22:52 Matthias Kaehlcke
2021-05-11 22:52 ` [PATCH v10 5/5] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub Matthias Kaehlcke
2021-05-12  7:19 ` [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver Alexander Dahl
2021-05-12 16:37   ` Matthias Kaehlcke
2021-05-21 12:30 ` Greg Kroah-Hartman
2021-05-25 17:42   ` Matthias Kaehlcke [this message]

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