w1: Add driver for i.MX bus master controller

Two variants of controllers are supported:
V1 (bitwise only) found in
	i.MX21, i.MX27, i.MX31, i.MX51
V2 (byte operations) found in
	i.MX25, i.MX35, i.MX50, i.MX53

Only tested on i.MX53 hardware but in both modes
(by modifying the device tree).

Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>

1 files changed, 37 insertions, 0 deletions

diff --git a/doc/device-tree-bindings/w1/mxc-w1.txt b/doc/device-tree-bindings/w1/mxc-w1.txt
new file mode 100644
index 0000000000..1fb49cc111
--- /dev/null
+++ b/doc/device-tree-bindings/w1/mxc-w1.txt
@@ -0,0 +1,37 @@
+NXP i.MX (MXC) One wire bus master controller
+=======================
+
+Child nodes are required in device tree. The driver will detect
+the devices serial number and then search in the child nodes in the device tree
+for the proper node and try to match it with the device.
+
+Also check doc/device-tree-bindings/w1-eeprom for possible child nodes drivers
+
+Driver:
+- drivers/w1/mxc_w1.c
+
+Required properties:
+- compatible : should be one of
+	"fsl,imx21-owire", "fsl,imx27-owire", "fsl,imx31-owire", "fsl,imx25-owire"
+	"fsl,imx25-owire", "fsl,imx35-owire", "fsl,imx50-owire", "fsl,imx53-owire"
+
+- reg : Address and length of the register set for the device
+
+Optional:
+* none
+
+Example:
+	onewire {
+		compatible = "fsl,imx53-owire";
+		reg = <0x63fa4000 0x4000>;
+	};
+
+Example with child:
+	onewire {
+		compatible = "fsl,imx53-owire";
+		reg = <0x63fa4000 0x4000>;
+
+		eeprom1: eeprom@0 {
+			compatible = "maxim,ds24xxx";
+		};
+	};