Document the beaglebone's cape driver bindings.
Signed-off-by: Pantelis Antoniou <pa...@antoniou-consulting.com>
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+* TI Beaglebone DT Overlay Cape Driver
+
+Required properties:
+
+- compatible: "ti,bone-capemgr"
+
+- eeprom: Contains the phandle beaglebone's baseboard i2c eeprom.
+
+- baseboardmaps - node containing a list of supported
+ beaglebone revisions; each node in should have the
+ following properties:
+ - board-name: The board name stored in the baseboard
+ eeprom.
+ - compatible-name: The name which will be used for
+ matching compatible capes.
+
+- slots: node containing a list of slot nodes (which in the beaglebone
+ case correspond to I2C addresses for dynamically probed capes,
+ or an override slot definition for hardcoded capes.
+ - eeprom: Contains the phandle beaglebone's cape i2c eeprom.
+
+ It is possible to define override slots that will be activated
+ when the baseboard matches, and/or if supplied on the kernel command
+ line and/or when dynamically requested on runtime.
+ In that case the slot is marked with
+ - ti,cape-override: Marks a slot override.
+ - compatible: any of the "runtime", "kernel", or any compatible-name
+ on a matching baseboardmap node.
+ - Any of the eeprom-format-revision, board-name, version, manufacturer,
+ part-number, number-of-pins, serial-number, pin-usage, vdd-3v3exp,
+ vdd-5v, sys-5v, dc-supplied properties which fill in the simulated
+ cape's EEPROM fields. The part-number field is required, the rest
+ are optional taking into default values.
+
+- capemaps: node contains list of cape mappings, which allow converting
+ from a part-number & version tuple to the filename of the dtbo file.
+ - part-number: part number contained in the EEPROM
+ - version node containing a
+ - version: specific version to map to
+ - dtbo: name of the dtbo file
+
+Example:
+bone_capemgr {
+ compatible = "ti,bone-capemgr";
+ status = "okay";
+
+ eeprom = <&baseboard_eeprom>;
+
+ baseboardmaps {
+ baseboard_beaglebone: board@0 {
+ board-name = "A335BONE";
+ compatible-name = "ti,beaglebone";
+ };
+ };
+
+ slots {
+ slot@0 {
+ eeprom = <&cape_eeprom0>;
+ };
+
+ slot@1 {
+ eeprom = <&cape_eeprom1>;
+ };
+
+ slot@2 {
+ eeprom = <&cape_eeprom2>;
+ };
+
+ slot@3 {
+ eeprom = <&cape_eeprom3>;
+ };
+ };
+
+ /* mapping between board names and dtb objects */
+ capemaps {
+ /* Weather cape */
+ cape@0 {
+ part-number = "BB-BONE-WTHR-01";
+ version@00A0 {
+ version = "00A0";
+ dtbo = "cape-bone-weather-00A0.dtbo";
+ };
+ };
+ };
+};
+
+Example of the override syntax when used on a bone compatible foo board.
+
+{
+ ...
+
+ baseboardmaps {
+ ...
+ baseboard_beaglebone: board@0 {
+ board-name = "A335FOO";
+ compatible-name = "ti,foo";
+ };
+
+ slot@6 {
+ ti,cape-override;
+ compatible = "ti,foo";
+ board-name = "FOO-hardcoded";
+ version = "00A0";
+ manufacturer = "Texas Instruments";
+ part-number = "BB-BONE-FOO-01";
+ };
+ };
+
+};
+
--
1.7.12
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