From: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
Add binding document for the i2c driver of SAM FPGA.
Signed-off-by: Georgi Vlaev <gvlaev@xxxxxxxxxxx>
[Ported from Juniper kernel]
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
.../devicetree/bindings/i2c/i2c-sam-mux.txt | 20 ++++++++++
Documentation/devicetree/bindings/i2c/i2c-sam.txt | 44 ++++++++++++++++++++++
2 files changed, 64 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-sam.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt b/Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt
new file mode 100644
index 0000000..10ddffa
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-sam-mux.txt
@@ -0,0 +1,20 @@
+Juniper's SAM FPGA I2C accelerator mux
+
+The SAM FPGA I2C mux is present only on Juniper SAM FPGA PTX series
+of routers.
+
+The definition of the i2c sam bus is located in the i2c-sam.txt document.
+
+Required properties:
+- compatible: should be "jnx,i2c-sam-mux".
+- reg: master number and mux number.
+
+Optional properties:
+- speed: If present must be either 100000 or 400000. No other values supported.
+
+Examples:
+
+pe1i2c: i2c-sam-mux@1,0 {
+ compatible = "jnx,i2c-sam-mux";
+ reg = <1 0>;
+};
diff --git a/Documentation/devicetree/bindings/i2c/i2c-sam.txt b/Documentation/devicetree/bindings/i2c/i2c-sam.txt
new file mode 100644
index 0000000..4830b48
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-sam.txt
@@ -0,0 +1,44 @@
+Juniper's SAM FPGA I2C accelerator
+
+The SAM FPGA accelerator is used to connect the large number of
+I2C muxes that are present on Juniper PTX series of routers.
+While it's an i2c bus, no other devices are located besides
+i2c-sam-mux devices.
+
+The definition of the i2c sam mux is located in the i2c-sam-mux.txt document.
+
+Required properties:
+- compatible: should be "jnx,i2c-sam".
+- #address-cells: should be 2.
+- #size-cells: should be 0.
+- mux-channels: number of mux channels present
+
+Optional properties:
+- reg: offset and length of the register set for the device are optional since
+ typically the register range is provided by the parent SAM MFD device.
+- master-offset: Offset of where the master register memory starts.
+ Default value is 0x8000.
+- reverse-fill: Fill the start entries of transactions in reverse order
+- priority-tables: Use the pre-programmed priority tables in the FPGA
+- i2c-options: list of options to be written to the option field in the
+ FPGA controlling things like SCL push-pull drives, hold-times, etc.
+- bus-range: start of bus master range and number of masters.
+
+Examples:
+
+i2c-sam {
+ compatible = "jnx,i2c-sam";
+ mux-channels = <2>;
+ #size-cells = <0>;
+ #address-cells = <2>;
+
+ /* PE0 */ pe0i2c: i2c-sam-mux@0,0 {
+ compatible = "jnx,i2c-sam-mux";
+ reg = <0 0>;
+ };
+
+ /* PE1 */ pe1i2c: i2c-sam-mux@1,0 {
+ compatible = "jnx,i2c-sam-mux";
+ reg = <1 0>;
+ };
+};
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
