dt-bindings: can: m_can: Document new can transceiver binding

Add information regarding can-transceiver binding. This is especially
important for MCAN since the IP allows CAN FD mode to run significantly
faster than what most transceivers are capable of.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/Documentation/devicetree/bindings/net/can/m_can.txt b/Documentation/devicetree/bindings/net/can/m_can.txt
index 63e9042..ed61438 100644 (file)
--- a/Documentation/devicetree/bindings/net/can/m_can.txt
+++ b/Documentation/devicetree/bindings/net/can/m_can.txt
@@ -43,6 +43,11 @@ Required properties:
                          Please refer to 2.4.1 Message RAM Configuration in
                          Bosch M_CAN user manual for details.
 
+Optional Subnode:
+- can-transceiver      : Can-transceiver subnode describing maximum speed
+                         that can be used for CAN/CAN-FD modes. See
+                         Documentation/devicetree/bindings/net/can/can-transceiver.txt
+                         for details.
 Example:
 SoC dtsi:
 m_can1: can@20e8000 {
@@ -63,4 +68,8 @@ Board dts:
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_m_can1>;
        status = "enabled";
+
+       can-transceiver {
+               max-bitrate = <5000000>;
+       };
 };