add M_CAN device tree binding documentation
Cc: Wolfgang Grandegger <wg@xxxxxxxxxxxxxx>
Cc: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Oliver Hartkopp <socketcan@xxxxxxxxxxxx>
Cc: Varka Bhadram <varkabhadram@xxxxxxxxx>
Signed-off-by: Dong Aisheng <b29396@xxxxxxxxxxxxx>
---
.../devicetree/bindings/net/can/m_can.txt | 65 ++++++++++++++++++++
1 files changed, 65 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/net/can/m_can.txt
diff --git a/Documentation/devicetree/bindings/net/can/m_can.txt b/Documentation/devicetree/bindings/net/can/m_can.txt
new file mode 100644
index 0000000..c4cb263
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/can/m_can.txt
@@ -0,0 +1,65 @@
+Bosch MCAN controller Device Tree Bindings
+-------------------------------------------------
+
+Required properties:
+- compatible : Should be "bosch,m_can" for M_CAN controllers
+- reg : physical base address and size of the M_CAN
+ registers map and Message RAM
+- reg-names : Should be "m_can" and "message_ram"
+- interrupts : Should be the interrupt number of M_CAN interrupt
+ line 0 and line 1, could be same if sharing
+ the same interrupt.
+- interrupt-names : Should contain "int0" and "int1"
+- clocks : Clocks used by controller, should be host clock
+ and CAN clock.
+- clock-names : Should contain "hclk" and "cclk"
+- pinctrl-<n> : Pinctrl states as described in bindings/pinctrl/pinctrl-bindings.txt
+- pinctrl-names : Names corresponding to the numbered pinctrl states
+- mram-cfg : Message RAM configuration data.
+ Multiple M_CAN instances can share the same Message RAM and each element(e.g
+ Rx FIFO or Tx Buffer and etc) number in Message RAM is also configurable,
+ so this property is telling driver how the shared or private Message RAM
+ are used by this M_CAN controller.
+
+ The format should be as follows:
+ <offset sidf_elems xidf_elems rxf0_elems rxf1_elems rxb_elems
+ txe_elems txb_elems>
+ The 'offset' is an address offset of the Message RAM where the following
+ elements start from. This is usually set to 0x0 if you're using a private
+ Message RAM. The remain cells are used to specify how many elements are used
+ for each FIFO/Buffer.
+
+M_CAN includes the following elements according to user manual:
+11-bit Filter 0-128 elements / 0-128 words
+29-bit Filter 0-64 elements / 0-128 words
+Rx FIFO 0 0-64 elements / 0-1152 words
+Rx FIFO 1 0-64 elements / 0-1152 words
+Rx Buffers 0-64 elements / 0-1152 words
+Tx Event FIFO 0-32 elements / 0-64 words
+Tx Buffers 0-32 elements / 0-576 words
+
+Please refer to 2.4.1 Message RAM Configuration in Bosch M_CAN user manual
+for details.
+
+Example:
+SoC dtsi:
+m_can1: can@020e8000 {
+ compatible = "bosch,m_can";
+ reg = <0x020e8000 0x4000>, <0x02298000 0x4000>;
+ reg-names = "m_can", "message_ram";
+ interrupts = <0 114 0x04>,
+ <0 114 0x04>;
+ interrupt-names = "int0", "int1";
+ clocks = <&clks IMX6SX_CLK_CANFD>,
+ <&clks IMX6SX_CLK_CANFD>;
+ clock-names = "hclk", "cclk";
+ mram-cfg = <0x0 0 0 32 0 0 0 1>;
+ status = "disabled";
+};
+
+Board dtsi:
+&m_can1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_m_can1>;
+ status = "enabled";
+};
--
1.7.8
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