expo: Allow menu items to have values
At present menu items are stored according to their sequence number in
the menu. In some cases we may want to have holes in that sequence, or
not use a sequence at all.
Add a new 'value' property for menu items. This will be used for
reading and writing, if present. If there is no 'value' property, then
the normal sequence number will be used instead.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/develop/expo.rst b/doc/develop/expo.rst
index d8115c4..cc7c361 100644
--- a/doc/develop/expo.rst
+++ b/doc/develop/expo.rst
@@ -361,6 +361,13 @@
Specifies the ID for each menu item. These are used for checking which item
has been selected.
+item-value
+ type: u32 list, optional
+
+ Specifies the value for each menu item. These are used for saving and
+ loading. If this is omitted the value is its position in the menu (0..n-1).
+ Valid values are positive and negative integers INT_MIN...(INT_MAX - 1).
+
item-label / item-label-id
type: string list / u32 list, required
@@ -474,6 +481,9 @@
/* IDs for the menu items */
item-id = <ID_CPU_SPEED_1 ID_CPU_SPEED_2
ID_CPU_SPEED_3>;
+
+ /* values for the menu items */
+ item-value = <(-1) 3 6>;
};
power-loss {