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From: Matthias Kaehlcke <mka@chromium.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Mathias Nyman <mathias.nyman@linux.intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>,
	Mathias Nyman <mathias.nyman@intel.com>,
	Felipe Balbi <balbi@kernel.org>,
	devicetree@vger.kernel.org, Peter Chen <peter.chen@kernel.org>,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	Bastien Nocera <hadess@hadess.net>,
	Ravi Chandra Sadineni <ravisadineni@chromium.org>,
	Michal Simek <michal.simek@xilinx.com>,
	Douglas Anderson <dianders@chromium.org>,
	Roger Quadros <rogerq@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Dmitry Osipenko <digetx@gmail.com>,
	Fabio Estevam <festevam@gmail.com>
Subject: Re: [PATCH v16 6/7] usb: host: xhci-plat: Create platform device for onboard hubs in probe()
Date: Wed, 20 Oct 2021 14:01:21 -0700	[thread overview]
Message-ID: <YXCDobJSuytwthoA@google.com> (raw)
In-Reply-To: <20211020203720.GA1137200@rowland.harvard.edu>

On Wed, Oct 20, 2021 at 04:37:20PM -0400, Alan Stern wrote:
> On Wed, Oct 20, 2021 at 01:27:40PM -0700, Matthias Kaehlcke wrote:
> > Hi Mathias,
> > 
> > On Wed, Oct 20, 2021 at 04:05:37PM +0300, Mathias Nyman wrote:
> > > If separate devices for controlling onboard hub power is the right solution then
> > > how about creating the onboard hub device in usb_add_hcd() (hcd.c), and
> > > store it in struct usb_hcd.
> > > 
> > > A bit like how the roothub device is created, or PHYs are tuned.
> > 
> > Sure, that sounds feasible, even better if it's handled in a single place
> > and different types of controllers don't have to add support separately.
> 
> Bear in mind that this would prevent you from working with onboard
> non-root hubs.

My goal is to (architecturally) support nested hubs, but TBH I haven't
looked much into such a configuration since I don't have hardware for
testing. My assumption was that support for onboard hubs connected to
non-root hubs whould have to be added to the generic hub driver.

Could you elaborate in how far you think it would be different for
xhci_plat vs generic hcd?

  reply	other threads:[~2021-10-20 21:02 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-13 19:52 [PATCH v16 0/7] usb: misc: Add onboard_usb_hub driver Matthias Kaehlcke
2021-08-13 19:52 ` [PATCH v16 1/7] " Matthias Kaehlcke
2021-11-11 23:31   ` Doug Anderson
2021-11-16  2:08     ` Matthias Kaehlcke
2021-08-13 19:52 ` [PATCH v16 2/7] of/platform: Add stubs for of_platform_device_create/destroy() Matthias Kaehlcke
2021-08-13 19:52 ` [PATCH v16 3/7] ARM: configs: Explicitly enable USB_XHCI_PLATFORM where needed Matthias Kaehlcke
2021-08-26  6:45   ` Roger Quadros
2021-08-26  7:56   ` Krzysztof Kozlowski
2021-08-13 19:52 ` [PATCH v16 4/7] arm64: defconfig: Explicitly enable USB_XHCI_PLATFORM Matthias Kaehlcke
2021-08-26  6:46   ` Roger Quadros
2021-08-13 19:52 ` [PATCH v16 5/7] usb: Specify dependencies on USB_XHCI_PLATFORM with 'depends on' Matthias Kaehlcke
2021-08-26  6:46   ` Roger Quadros
2021-11-11 23:48   ` Doug Anderson
2021-11-16 18:07     ` Matthias Kaehlcke
2021-08-13 19:52 ` [PATCH v16 6/7] usb: host: xhci-plat: Create platform device for onboard hubs in probe() Matthias Kaehlcke
2021-10-20 13:05   ` Mathias Nyman
2021-10-20 20:27     ` Matthias Kaehlcke
2021-10-20 20:37       ` Alan Stern
2021-10-20 21:01         ` Matthias Kaehlcke [this message]
2021-10-20 21:57           ` Alan Stern
2021-08-13 19:52 ` [PATCH v16 7/7] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub Matthias Kaehlcke
2021-09-21 17:08 ` [PATCH v16 0/7] usb: misc: Add onboard_usb_hub driver Matthias Kaehlcke
2021-10-14 21:38   ` Doug Anderson
2021-10-15  6:39     ` Greg Kroah-Hartman
2021-10-19 16:04       ` Fabrice Gasnier
2021-10-19 22:10         ` Matthias Kaehlcke
2021-10-20  6:21         ` Michal Simek
2021-10-20 17:41           ` Matthias Kaehlcke

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