can: ti_hecc: Add TI HECC DT binding documentation

DT binding documentation for TI High End CAN Controller

Signed-off-by: Anton Glukhov <anton.a.glukhov@gmail.com>
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/net/can/ti_hecc.txt b/Documentation/devicetree/bindings/net/can/ti_hecc.txt
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+Texas Instruments High End CAN Controller (HECC)
+================================================
+
+This file provides information, what the device node
+for the hecc interface contains.
+
+Required properties:
+- compatible: "ti,am3517-hecc"
+- reg: addresses and lengths of the register spaces for 'hecc', 'hecc-ram'
+       and 'mbx'
+- reg-names :"hecc", "hecc-ram", "mbx"
+- interrupts: interrupt mapping for the hecc interrupts sources
+- clocks: clock phandles (see clock bindings for details)
+
+Optional properties:
+- ti,use-hecc1int: if provided configures HECC to produce all interrupts
+                  on HECC1INT interrupt line. By default HECC0INT interrupt
+                  line will be used.
+- xceiver-supply: regulator that powers the CAN transceiver
+
+Example:
+
+For am3517evm board:
+       hecc: can@5c050000 {
+               compatible = "ti,am3517-hecc";
+               reg = <0x5c050000 0x80>,
+                     <0x5c053000 0x180>,
+                     <0x5c052000 0x200>;
+               reg-names = "hecc", "hecc-ram", "mbx";
+               interrupts = <24>;
+               clocks = <&hecc_ck>;
+       };