linux-kernel - Re: [PATCH 4/4] dt-bindings: Document the DT bindings for lan78xx

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Date:   Thu, 12 Apr 2018 15:10:57 +0100
From:   Phil Elwell <phil@...pberrypi.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....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@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 4/4] dt-bindings: Document the DT bindings for lan78xx

Hi Andrew,

On 12/04/2018 15:04, Andrew Lunn wrote:
> On Thu, Apr 12, 2018 at 02:55:36PM +0100, Phil Elwell 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, adding it to
>> MAINTAINERS at the same time.
> 
> Hi Phil
> 
> How you link an OF node to a USB device is not obvious. Could you
> please include either a pointer to some binding documentation, or make
> your example show it.

Thanks for the feedback. Would you consider this (lifted from the Pi 3B+ Device Tree)
a sufficient example?

&usb {
	usb1@1 {
		compatible = "usb424,2514";
		reg = <1>;
		#address-cells = <1>;
		#size-cells = <0>;

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

			ethernet: usbether@1 {
				compatible = "usb424,7800";
				reg = <1>;
				microchip,eee-enabled;
				microchip,tx-lpi-timer = <600>; /* non-aggressive*/
				/*
				 * led0 = 1:link1000/activity
				 * led1 = 6:link10/100/activity
				 */
				microchip,led-modes = <1 6>;
			};
		};
	};
};

Phil