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From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh@kernel.org>,
	linuxarm@huawei.com, mauro.chehab@huawei.com,
	John Stultz <john.stultz@linaro.org>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 2/4] misc: hisi_hikey_usb: change the DT schema
Date: Thu, 2 Sep 2021 15:38:20 +0200	[thread overview]
Message-ID: <20210902153820.5624b57f@coco.lan> (raw)
In-Reply-To: <20210902151053.7ddfbe3a@coco.lan>

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

  reply	other threads:[~2021-09-02 13:38 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-02 11:28 [PATCH v3 0/4] Make USB ports to work on HiKey960/970 Mauro Carvalho Chehab
2021-09-02 11:28 ` [PATCH v3 1/4] dt-bindings: misc: add schema for USB hub on Kirin devices Mauro Carvalho Chehab
2021-09-02 11:28 ` [PATCH v3 2/4] misc: hisi_hikey_usb: change the DT schema Mauro Carvalho Chehab
2021-09-02 11:40   ` Greg Kroah-Hartman
2021-09-02 13:10     ` Mauro Carvalho Chehab
2021-09-02 13:38       ` Mauro Carvalho Chehab [this message]
2021-09-02 13:56         ` Greg Kroah-Hartman
2021-09-02 14:35           ` Mauro Carvalho Chehab
2021-09-02 17:28             ` Matthias Kaehlcke
2021-09-02 18:29               ` John Stultz
2021-09-02 20:03                 ` Matthias Kaehlcke
2021-09-02 20:31                   ` John Stultz
2021-09-02 21:34                     ` Matthias Kaehlcke
2021-09-02 21:42                     ` Mauro Carvalho Chehab
2021-09-02 18:45   ` John Stultz
2021-09-02 11:28 ` [PATCH v3 3/4] arm64: dts: hisilicon: Add usb mux hub for hikey970 Mauro Carvalho Chehab
2021-09-02 11:28 ` [PATCH v3 4/4] arm64: dts: hisilicon: Add usb mux hub for hikey960 Mauro Carvalho Chehab

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