linux-kernel - Re: [PATCH 3/3] ARM: dts: lan966x: Add UDPHS support

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Date:   Fri, 20 May 2022 14:37:26 +0200
From:   Herve Codina <herve.codina@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 3/3] ARM: dts: lan966x: Add UDPHS support

Hi Krzysztof, Sergei

On Fri, 13 May 2022 14:54:26 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 13/05/2022 12:58, Herve Codina wrote:
> > Add UDPHS (the USB High Speed Device Port controller) support.
> > The UDPHS IP present in the lan966x SOC is the same as the one
> > present in the SAMA5D3 SOC
> > 
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > ---
> >  arch/arm/boot/dts/lan966x.dtsi | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> > 
> > diff --git a/arch/arm/boot/dts/lan966x.dtsi b/arch/arm/boot/dts/lan966x.dtsi
> > index 7d2869648050..4c09f3166d27 100644
> > --- a/arch/arm/boot/dts/lan966x.dtsi
> > +++ b/arch/arm/boot/dts/lan966x.dtsi
> > @@ -211,6 +211,17 @@ can0: can@...1c000 {
> >  			status = "disabled";
> >  		};
> >  
> > +		udc: udphs@...08000 {  
> 
> Generic node names, so it looks like usb. For example HCD schema
> requires it. I am not sure which bindings are used here, but anyway once
> they might require usb...
> 

HCD are related to the Host controller.
Here we are talking about a device.

In existing bindings related to USB device (or OTG as an OTG can be a
host or a device) on several SOCs, we can find:
- usb1: gadget@...a4000
- usb_otg: usb@...3000
- usb: usb@...00000
- udc: usb@...40000
- usb_otg_hs: usb_otg_hs@...ab000


So I will change to
  udc: usb@...08000

Is that ok for you ?

Regards,
Herve

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com