added Readme

README.md

@@ -0,0 +1,45 @@
+Bosch M_CAN (CAN Controller) Device Driver
+==========================================
+
+Files
+-----
+* *.c		: Driver C-Source Files
+* Kconfig	: Config file for menuconfig etc.
+* Makefile	: Makefile for Kernel Build
+
+Compile
+-------
+compile as normal Kernel Driver.
+* Driver can be compiled as an externel module.
+* Driver can be compiled statically into the kernel.
+
+
+Device Tree
+-----------
+The following code shows a basic device tree for an M_CAN node:
+
+```
+/* M_CAN Device Tree Nodes */
+hclk: hclk {
+	compatible = "fixed-clock";
+	#clock-cells = < 0 >;
+	clock-frequency = <50000000>;
+};
+cclk: cclk {
+	compatible = "fixed-clock";
+	#clock-cells = < 0 >;
+	clock-frequency = <40000000>;
+};	
+mcan0: can@0xff240000 {
+	compatible = "bosch,m_can-3.2.1";
+	reg = <0xff240000 0x200>,<0xff260000 0x4000>;
+	reg-names = "m_can", "message_ram";
+	interrupt-parent = <&intc>;
+	/* Shared Interrupt for every M_CAN */
+	interrupts = <0x0 40 0x4>;
+	interrupt-names = "int0";
+	clocks = <&hclk>, <&cclk>;
+	clock-names = "hclk", "cclk";
+	bosch,mram-cfg = <0x0 128 64 64 32 64 32 32>;
+};
+```