linux-kernel - Re: [PATCH v3 07/14] xhci: Add Intel cherrytrail extended cap / otg phy mux handling

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Message-ID: <59D613DC.5020906@intel.com>
Date:   Thu, 5 Oct 2017 14:13:32 +0300
From:   Mathias Nyman <mathias.nyman@...el.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 07/14] xhci: Add Intel cherrytrail extended cap / otg
 phy mux handling

On 22.09.2017 21:37, Hans de Goede wrote:
> The Intel cherrytrail xhci controller has an extended cap mmio-range
> which contains registers to control the muxing to the xhci (host mode)
> or the dwc3 (device mode) and vbus-detection for the otg usb-phy.
>
> Having a mux driver included in the xhci code (or under drivers/usb/host)
> is not desirable. So this commit adds a simple handler for this extended
> capability, which creates a platform device with the caps mmio region as
> resource, this allows us to write a separate platform mux driver for the
> mux.
>
> Note this commit adds a call to the new xhci_ext_cap_init() function
> to xhci_pci_probe(), it is added here because xhci_ext_cap_init() must
> be called only once. If in the future we also want to handle ext-caps
> on non pci XHCI HCDs from xhci_ext_cap_init() a call to it should also
> be added to other bus probe paths.
>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
> Changes in v2:
> -Check xHCI controller PCI device-id instead of only checking for the
>   Intel Extended capability ID, as the Extended capability ID is used on
>   other model Intel xHCI controllers too
>
> Changes in v3:
> -Add a new generic xhci_ext_cap_init() function and handle the new
>   XHCI_INTEL_CHT_USB_MUX quirk there.
> ---

Acked-by: Mathias Nyman <mathias.nyman@...ux.intel.com>