RE: [PATCH v3 07/11] dt-bindings: phy: renesas,usb2-phy: Document RZ/G2L phy bindings

From: Biju Das <biju.das.jz@bp.renesas.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Kishon Vijay Abraham I <kishon@ti.com>,
	Vinod Koul <vkoul@kernel.org>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	"linux-phy@lists.infradead.org" <linux-phy@lists.infradead.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Biju Das <biju.das@bp.renesas.com>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>
Subject: RE: [PATCH v3 07/11] dt-bindings: phy: renesas,usb2-phy: Document RZ/G2L phy bindings
Date: Wed, 30 Jun 2021 10:28:21 +0000	[thread overview]
Message-ID: <OS0PR01MB59221A03F825931B778C9E1586019@OS0PR01MB5922.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <CAMuHMdWbhY9i+WvV77LVNYhLBLQBVCojgEwM93A-pvFf9Eab1g@mail.gmail.com>

Hi Geert,

Thanks for the feedback.

> Subject: Re: [PATCH v3 07/11] dt-bindings: phy: renesas,usb2-phy: Document
> RZ/G2L phy bindings
> 
> Hi Biju,
> 
> Thanks for your patch!
> 
> On Wed, Jun 30, 2021 at 9:31 AM Biju Das <biju.das.jz@bp.renesas.com>
> wrote:
> > Document USB phy bindings for RZ/G2L SoC.
> >
> > RZ/G2L USB2.0 phy uses line ctrl register for OTG_ID pin changes.
> > Apart from this it uses a different OTG-BC interrupt bit for device
> recognition.
> 
> Nothing about resets? But see below...

Initially the reset of USB/PHY port is in asserted state. So we need
to perform a release reset using USBPHY control IP. 

OK, will add this in V4.

> 
> >
> > Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
> > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > v2->v3
> >  * Created a new compatible for RZ/G2L as per Geert's suggestion.
> >  * Added resets required properties for RZ/G2L SoC.
> > ---
> >  .../bindings/phy/renesas,usb2-phy.yaml         | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
> > b/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
> > index d5dc5a3cdceb..a7e585ff28dc 100644
> > --- a/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
> > +++ b/Documentation/devicetree/bindings/phy/renesas,usb2-phy.yaml
> > @@ -30,6 +30,9 @@ properties:
> >                - renesas,usb2-phy-r8a77995 # R-Car D3
> >            - const: renesas,rcar-gen3-usb2-phy
> >
> > +      - items:
> > +          - const: renesas,usb2-phy-r9a07g044 # RZ/G2{L,LC}
> > +
> >    reg:
> >      maxItems: 1
> >
> > @@ -91,6 +94,21 @@ required:
> >    - clocks
> >    - '#phy-cells'
> >
> > +allOf:
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            const: renesas,usb2-phy-r9a07g044
> > +    then:
> > +      properties:
> > +        resets:
> > +          items:
> > +            - description: USB phy reset
> > +            - description: reset of USB 2.0 host side
> 
> Do you need the second reset?
> Looking at your .dtsi patch, the second reset is shared with ehci/ohci, so
> perhaps it makes sense to drop it from the phy node?

OK. Agreed will drop the second reset from phy node.

Cheers,
Biju

> 
> > +      required:
> > +        - resets
> > +
> >  additionalProperties: false
> >
> >  examples:
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-
> m68k.org
> 
> In personal conversations with technical people, I call myself a hacker.
> But when I'm talking to journalists I just say "programmer" or something
> like that.
>                                 -- Linus Torvalds