linux-kernel - Re: [PATCH resend v3 3/3] dt-bindings: Document the DT bindings for lan78xx

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Date:   Thu, 19 Apr 2018 11:07:45 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Phil Elwell <phil@...pberrypi.org>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        netdev <netdev@...r.kernel.org>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>
Subject: Re: [PATCH resend v3 3/3] dt-bindings: Document the DT bindings for lan78xx

On Thu, Apr 19, 2018 at 10:16 AM, Phil Elwell <phil@...pberrypi.org> wrote:
> The Microchip LAN78XX family of devices are Ethernet controllers with
> a USB interface. Despite being discoverable devices it can be useful to
> be able to configure them from Device Tree, particularly in low-cost
> applications without an EEPROM or programmed OTP.
>
> Document the supported properties in a bindings file.
>
> Signed-off-by: Phil Elwell <phil@...pberrypi.org>
> ---
>  .../devicetree/bindings/net/microchip,lan78xx.txt  | 54 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/microchip,lan78xx.txt
>
> diff --git a/Documentation/devicetree/bindings/net/microchip,lan78xx.txt b/Documentation/devicetree/bindings/net/microchip,lan78xx.txt
> new file mode 100644
> index 0000000..a5d701b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/microchip,lan78xx.txt
> @@ -0,0 +1,54 @@
> +Microchip LAN78xx Gigabit Ethernet controller
> +
> +The LAN78XX devices are usually configured by programming their OTP or with
> +an external EEPROM, but some platforms (e.g. Raspberry Pi 3 B+) have neither.
> +The Device Tree properties, if present, override the OTP and EEPROM.
> +
> +Required properties:
> +- compatible: Should be one of "usb424,7800", "usb424,7801" or "usb424,7850".
> +
> +Optional properties:
> +- local-mac-address:   see ethernet.txt
> +- mac-address:         see ethernet.txt
> +
> +Optional properties of the embedded PHY:
> +- microchip,led-modes: a 0..4 element vector, with each element configuring
> +  the operating mode of an LED. Omitted LEDs are turned off. Allowed values
> +  are defined in "include/dt-bindings/net/microchip-lan78xx.h".
> +
> +Example:
> +
> +/* Based on the configuration for a Raspberry Pi 3 B+ */
> +&usb {
> +       usb1@1 {

Same comments as in the dts file:

usb-port@1

> +               compatible = "usb424,2514";
> +               reg = <1>;
> +               #address-cells = <1>;
> +               #size-cells = <0>;
> +
> +               usb1_1@1 {

usb-port@1

> +                       compatible = "usb424,2514";
> +                       reg = <1>;
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +
> +                       ethernet: usbether@1 {

ethernet@1

> +                               compatible = "usb424,7800";
> +                               reg = <1>;
> +                               local-mac-address = [ 00 11 22 33 44 55 ];
> +
> +                               mdio {
> +                                       #address-cells = <0x1>;
> +                                       #size-cells = <0x0>;
> +                                       eth_phy: ethernet-phy@1 {
> +                                               reg = <1>;
> +                                               microchip,led-modes = <
> +                                                       LAN78XX_LINK_1000_ACTIVITY
> +                                                       LAN78XX_LINK_10_100_ACTIVITY
> +                                               >;
> +                                       };
> +                               };
> +                       };
> +               };
> +       };
> +};
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 23735d9..91cb961 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14572,6 +14572,7 @@ M:      Woojung Huh <woojung.huh@...rochip.com>
>  M:     Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
>  L:     netdev@...r.kernel.org
>  S:     Maintained
> +F:     Documentation/devicetree/bindings/net/microchip,lan78xx.txt
>  F:     drivers/net/usb/lan78xx.*
>  F:     include/dt-bindings/net/microchip-lan78xx.h
>
> --
> 2.7.4
>