linux-kernel - Re: [PATCH v2 08/11] misc: hisi_hikey_usb: Driver to support onboard USB gpio hub on Hikey960

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Date:   Wed, 9 Sep 2020 10:35:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Yu Chen <chenyu56@...wei.com>,
        John Stultz <john.stultz@...aro.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 08/11] misc: hisi_hikey_usb: Driver to support onboard
 USB gpio hub on Hikey960

On Mon, Sep 07, 2020 at 05:59:32PM +0200, Mauro Carvalho Chehab wrote:
> From: Yu Chen <chenyu56@...wei.com>
> 
> The HiKey960 has a fairly complex USB configuration due to it
> needing to support a USB-C port for host/device mode and multiple
> USB-A ports in host mode, all using a single USB controller.
> 
> See schematics here:
>   https://github.com/96boards/documentation/raw/master/consumer/hikey/hikey960/hardware-docs/HiKey960_Schematics.pdf
> 
> This driver acts as a usb-role-switch intermediary, intercepting
> the role switch notifications from the tcpm code, and passing
> them on to the dwc3 core.
> 
> In doing so, it also controls the onboard hub and power gpios in
> order to properly route the data lines between the USB-C port
> and the onboard hub to the USB-A ports.
> 
> Signed-off-by: Yu Chen <chenyu56@...wei.com>
> [jstultz: Major rework to make the driver a usb-role-switch
>           intermediary]
> Signed-off-by: John Stultz <john.stultz@...aro.org>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  MAINTAINERS                   |   7 ++
>  drivers/misc/Kconfig          |   9 ++
>  drivers/misc/Makefile         |   1 +
>  drivers/misc/hisi_hikey_usb.c | 205 ++++++++++++++++++++++++++++++++++
>  4 files changed, 222 insertions(+)
>  create mode 100644 drivers/misc/hisi_hikey_usb.c

Can this, and the next patch, go into my char-misc tree independent of
the other patches in this series?  Or do they all need to go in
together?

thanks,

greg k-h