netdev - RE: [PATCH v2] dt-bindings: net: renesas,etheravb: Document Gigabit Ethernet IP

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Date:   Thu, 12 Aug 2021 08:59:58 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Sergei Shtylyov <sergei.shtylyov@...il.com>,
        netdev <netdev@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH v2] dt-bindings: net: renesas,etheravb: Document Gigabit
 Ethernet IP

Hi Geert,

Thanks for the feedback.

> Subject: Re: [PATCH v2] dt-bindings: net: renesas,etheravb: Document
> Gigabit Ethernet IP
> 
> Hi Biju,
> 
> On Tue, Jul 27, 2021 at 2:35 PM Biju Das <biju.das.jz@...renesas.com>
> wrote:
> > Document Gigabit Ethernet IP found on RZ/G2L SoC.
> >
> > Gigabit Ethernet Interface includes Ethernet controller (E-MAC),
> > Internal TCP/IP Offload Engine (TOE) and Dedicated Direct memory
> > access controller (DMAC) for transferring transmitted Ethernet frames
> > to and received Ethernet frames from respective storage areas in the
> > URAM at high speed.
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> 
> Thanks for your patch!
> 
> > --- a/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> > +++ b/Documentation/devicetree/bindings/net/renesas,etheravb.yaml
> 
> > @@ -145,14 +142,20 @@ allOf:
> >        properties:
> >          compatible:
> >            contains:
> > -            const: renesas,etheravb-rcar-gen2
> > +            enum:
> > +              - renesas,etheravb-rcar-gen2
> > +              - renesas,rzg2l-gbeth
> >      then:
> >        properties:
> >          interrupts:
> > -          maxItems: 1
> > +          minItems: 1
> > +          maxItems: 3
> >          interrupt-names:
> > +          minItems: 1
> >            items:
> >              - const: mux
> > +            - const: int_fil_n
> > +            - const: int_arp_ns_n
> 
> I'm aware Rob has already applied this, but should the "int_" prefix be
> dropped?

OK. I will use "fil" and "arp" instead.

> The "_n" suffix is also a bit weird (albeit it matches the documentation).
> Usually it is used to indicate an active-low signal, but the interrupt is
> declared in the .dtsi with IRQ_TYPE_LEVEL_HIGH.
> 

But here on the interrupt mapping table(RZG2L_InterruptMapping_rev01.xlsx). It is mentioned as high. So I guess, it is correct.

> And the first interrupt is not a mux on RZ/G2L, but called "pif_int_n"
> (whatever "pif" might mean).

As per section 32.5.12 Interrupts, this interrupt include, Descriptor interrupts,
Error interrupts, reception interrupts and transmission interrupts.

The source status can be checked from individual status register. 

For me. This description looks like a mux interrupt.
Multiple interrupt sources ored together to generate an interrupt and status can be 
Checked from each individual register. 
Please let me know if my understanding is wrong.

I agree, on HW manual it is mentioned as pif_int_n. I can replace mux with pif instead. Please let me know.

Regards,
Biju




> 
> >          rx-internal-delay-ps: false
> >      else:
> >        properties:
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-
> 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