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SubjectRe: [PATCH v3 2/4] misc: hisi_hikey_usb: change the DT schema
Em Thu, 2 Sep 2021 15:10:53 +0200
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> escreveu:

> Em Thu, 2 Sep 2021 13:40:28 +0200
> Greg Kroah-Hartman <gregkh@linuxfoundation.org> escreveu:
>
> > On Thu, Sep 02, 2021 at 01:28:35PM +0200, Mauro Carvalho Chehab wrote:
> > > As there's no upstream DT bindings for this driver, let's
> > > update its DT schema, while it is not too late.
> >
> > So this is for 5.15-final?
>
> It can either be for 5.15 or 5.16, as there aren't any compatible
> under arch/ which uses the DT schema there. All patches adding
> such compatible are on this series. So, whatever version this
> is applied should be OK.

On a separate note, despite having "hisi_" on this driver's name, there's
nothing there that is really HiSilicon specific. What this driver does is
to control an USB HUB integrated inside a DT-based board, doing those
functions:

- Power on/off the chip;
- reset the HUB;
- control its OTG switch;
- control power on/off for an USB type-C connector;
- set USB role as host or device.

This is used on both HiKey 960 and HiKey 970 with the following
topology:

+-----+ +--------+ +---------+
| SoC | ---> | USB PHY| ---> | USB HUB | ---> USB 3.0
+-----+ +--------+ +---------+ and type-C ports

Both Kirin 960 and 970 SoCs have a Synapsys IP (DWC 3).

Both HiKey 960 and 970 cards use Richtek RT1711H Type-C Chip Driver
as part of the USB PHY logic, but they use different USB HUBs:

- HiKey 960 use a Microchip USB5734 HUB
- HiKey 970 use a TI TUSB8041 HUB

While I'm not sure how generic this driver can be, I'm thinking that
maybe a future patch could rename it to 'generic-usb-hub' or
something similar - finding a good name is always the hardest
part :-)

Thanks,
Mauro

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