This patch extends the i2cmux description to document how i2c child bus
numbers can be set from the device tree.
Signed-off-by: Bob Feretich <bob.feretich@xxxxxxxxxxxxxxx>
---
--- a/Documentation/devicetree/bindings/i2c/i2c-mux.txt 2015-05-07
13:27:32.571371080 -0700
+++ b/Documentation/devicetree/bindings/i2c/i2c-mux.txt 2015-05-07
13:31:58.699044026 -0700
@@ -58,3 +58,78 @@ Example :
};
};
};
+
+The I2C subsystem will assign names to the child busses dynamically in
+the form i2c-n; where 'n' is an incrementing number starting with the
+number following the previously highest allocated bus number.
+
+Aliases may be used to assign static child bus names. The alias name
+must be of the form i2cnn where nn is numeric. The numeric part (nn) is
+used to set the bus number.
+
+Example :
+
+/ {
+ aliases {
+ i2c10 = &im0;
+ i2c11 = &im1;
+ i2c12 = &im2;
+ i2c13 = &im3;
+ i2c14 = &im4;
+ i2c15 = &im5;
+ i2c16 = &im6;
+ i2c17 = &im7;
+ };
+};
+...
+ i2cmux@70 {
+ compatible = "nxp,pca9548";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x70>;
+
+ im0: i2cm@0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0>;
+ };
+ im1: i2cm@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <1>;
+ };
+ im2: i2cm@2 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <2>;
+ };
+ im3: i2cm@3 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <3>;
+ };
+ im4: i2cm@4 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <4>;
+ };
+ im5: i2cm@5 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <5>;
+ };
+ im6: i2cm@6 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <6>;
+ };
+ im7: i2cm@7 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <7>;
+ };
+ };
+
+The above file segment causes the child i2c busses to be named
+i2c-10 through i2c-17.
+
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