can: c_can: Add device tree support to Bosch C_CAN/D_CAN controller

Add device tree support to C_CAN/D_CAN controller and usage details
are added to device tree documentation. Driver was tested on AM335x
EVM.

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
For the of binding doc:
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 49 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/can/c_can.txt b/Documentation/devicetree/bindings/net/can/c_can.txt
new file mode 100644
index 00000000000..8f1ae81228e
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/c_can.txt
@@ -0,0 +1,49 @@
+Bosch C_CAN/D_CAN controller Device Tree Bindings
+-------------------------------------------------
+
+Required properties:
+- compatible            : Should be "bosch,c_can" for C_CAN controllers and
+                          "bosch,d_can" for D_CAN controllers.
+- reg                   : physical base address and size of the C_CAN/D_CAN
+                          registers map
+- interrupts            : property with a value describing the interrupt
+                          number
+
+Optional properties:
+- ti,hwmods             : Must be "d_can<n>" or "c_can<n>", n being the
+                          instance number
+
+Note: "ti,hwmods" field is used to fetch the base address and irq
+resources from TI, omap hwmod data base during device registration.
+Future plan is to migrate hwmod data base contents into device tree
+blob so that, all the required data will be used from device tree dts
+file.
+
+Example:
+
+Step1: SoC common .dtsi file
+
+        dcan1: d_can@481d0000 {
+                compatible = "bosch,d_can";
+                reg = <0x481d0000 0x2000>;
+                interrupts = <55>;
+                interrupt-parent = <&intc>;
+                status = "disabled";
+        };
+
+(or)
+
+        dcan1: d_can@481d0000 {
+                compatible = "bosch,d_can";
+                ti,hwmods = "d_can1";
+                reg = <0x481d0000 0x2000>;
+                interrupts = <55>;
+                interrupt-parent = <&intc>;
+                status = "disabled";
+        };
+
+Step 2: board specific .dts file
+
+        &dcan1 {
+                status = "okay";
+        };