linux-kernel - Re: [PATCH v3 2/4] misc: hisi_hikey

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Date:   Thu, 2 Sep 2021 15:56:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     Rob Herring <robh@...nel.org>, linuxarm@...wei.com,
        mauro.chehab@...wei.com, John Stultz <john.stultz@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] misc: hisi_hikey_usb: change the DT schema

On Thu, Sep 02, 2021 at 03:38:20PM +0200, Mauro Carvalho Chehab wrote:
> Em Thu, 2 Sep 2021 15:10:53 +0200
> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> escreveu:
> 
> > Em Thu, 2 Sep 2021 13:40:28 +0200
> > Greg Kroah-Hartman <gregkh@...uxfoundation.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 :-)

Try looking at:
	https://lore.kernel.org/r/20210813195228.2003500-1-mka@chromium.org
for another example of this.

thanks,

greg k-h