linux-kernel - Re: [PATCH net-next v2 1/2] dt-bindings: net: add DT bindings for Socionext UniPhier AVE

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Date:   Wed, 18 Oct 2017 19:23:55 +0900
From:   Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Masami Hiramatsu <masami.hiramatsu@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH net-next v2 1/2] dt-bindings: net: add DT bindings for Socionext UniPhier AVE

On Sat, 14 Oct 2017 01:41:12 +0900 <yamada.masahiro@...ionext.com> wrote:

> 2017-10-13 9:35 GMT+09:00 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>:
> > DT bindings for the AVE ethernet controller found on Socionext's
> > UniPhier platforms.
> >
> > Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>
> > Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
> > ---
> >  .../bindings/net/socionext,uniphier-ave4.txt       | 53 ++++++++++++++++++++++
> >  1 file changed, 53 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/net/socionext,uniphier-ave4.txt
> >
> > diff --git a/Documentation/devicetree/bindings/net/socionext,uniphier-ave4.txt b/Documentation/devicetree/bindings/net/socionext,uniphier-ave4.txt
> > new file mode 100644
> > index 0000000..25f4d92
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/socionext,uniphier-ave4.txt
> > @@ -0,0 +1,53 @@
> > +* Socionext AVE ethernet controller
> > +
> > +This describes the devicetree bindings for AVE ethernet controller
> > +implemented on Socionext UniPhier SoCs.
> > +
> > +Required properties:
> > + - compatible: Should be
> > +       - "socionext,uniphier-pro4-ave4" : for Pro4 SoC
> > +       - "socionext,uniphier-pxs2-ave4" : for PXs2 SoC
> > +       - "socionext,uniphier-ld20-ave4" : for LD20 SoC
> > +       - "socionext,uniphier-ld11-ave4" : for LD11 SoC
> 
> Nit.  LD11, LD20, in this order please.

I'll fix it. And also the SoC-dependent structures of the driver.

> > + - reg: Address where registers are mapped and size of region.
> > + - interrupts: Should contain the MAC interrupt.
> > + - phy-mode: See ethernet.txt in the same directory. Allow to choose
> > +       "rgmii", "rmii", or "mii" according to the PHY.
> > + - pinctrl-names: List of assigned state names, see pinctrl
> > +       binding documentation.
> > + - pinctrl-0: List of phandles to configure the GPIO pin,
> 
> 
> configure the GPIO pin?
> 
> git-grep found this phrase.
> 
> 
> $ git grep "List of phandles to configure the GPIO"
> Documentation/devicetree/bindings/net/microchip,enc28j60.txt:-
> pinctrl-0: List of phandles to configure the GPIO pin used as
> interrupt line,
> 
> 
> 
> 
> 
> > +       see pinctrl binding documentation. Choose this appropriately
> > +       according to phy-mode.
> > +       - <&pinctrl_ether_rgmii> if phy-mode is "rgmii".
> > +       - <&pinctrl_ether_rmii> if phy-mode is "rmii".
> > +       - <&pinctrl_ether_mii> if phy-mode is "mii".
> 
> pinctrl_ether_rgmii is just a label
> you just happened to write in your DT file.
> 
> This information is totally unrelated to hardware specification.
> It is not stable, either.

Surely this driver is independent from the pinctrl.
I'll remove the descriptions about the pinctrl.

> > + - phy-handle: Should point to the external phy device.
> > +       See ethernet.txt file in the same directory.
> > + - mdio subnode: Should be device tree subnode with the following required
> > +       properties:
> > +       - #address-cells: Must be <1>.
> > +       - #size-cells: Must be <0>.
> > +       - reg: phy ID number, usually a small integer.
> 
> 
> Are you talking about "Required subnode" in the "Required properties"?

It might be confused description. The subnode is separated from the properties.

> > +Optional properties:
> > + - local-mac-address: See ethernet.txt in the same directory.

In addition, I'll add "clocks" and "resets" according to another mail.

> > +
> > +Example:
> > +
> > +       ether: ethernet@...00000 {
> > +               compatible = "socionext,uniphier-ld20-ave4";
> > +               reg = <0x65000000 0x8500>;
> > +               interrupts = <0 66 4>;
> > +               pinctrl-names = "default";
> > +               pinctrl-0 = <&pinctrl_ether_rgmii>;
> > +               phy-mode = "rgmii";
> > +               phy-handle = <&ethphy>;
> > +               local-mac-address = [00 00 00 00 00 00];
> > +               mdio {
> > +                       #address-cells = <1>;
> > +                       #size-cells = <0>;
> > +                       ethphy: ethphy@1 {
> > +                               reg = <1>;
> > +                       };
> > +               };
> > +       };
> > --
> > 2.7.4
> >
> 
> 
> 
> -- 
> Best Regards
> Masahiro Yamada

---
Best Regards,
Kunihiko Hayashi