linux-kernel - [PATCH v2 3/3] dt-bindings: Document the DT bindings for lan78xx

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Date:   Wed, 18 Apr 2018 16:45:23 +0100
From:   Phil Elwell <phil@...pberrypi.org>
To:     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
Cc:     Phil Elwell <phil@...pberrypi.org>
Subject: [PATCH v2 3/3] dt-bindings: Document the DT bindings for lan78xx

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  | 44 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 45 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..fa68f9b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/microchip,lan78xx.txt
@@ -0,0 +1,44 @@
+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
+- 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-78xx.h".
+
+Example:
+
+/* Standard configuration for a Raspberry Pi 3 B+ */
+&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>;
+				local-mac-address = [ 00 11 22 33 44 55 ];
+				microchip,led-modes = <
+					LAN78XX_LINK_1000_ACTIVITY
+					LAN78XX_LINK_10_100_ACTIVITY
+				>;
+			};
+		};
+	};
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 9c9bc63..5352bbb 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-78xx.h
 
-- 
2.7.4