[PATCH] dt-bindings: power: supply: battery: allow longer ocv-capacity tables

[Ryan Brue]

ocv-capacity-table-N has been capped at 100 points since battery.txt was
converted to YAML, where the limit arrived without a stated reason.

The MT6397 fuel gauge is characterised per temperature by a table the
Amazon Fire HD 10 (2017) vendor device tree carries with 126 points, of
which 122 are expressible here - the remainder are greater than 100%
discharged, so the binding excludes those points. Boards carrying this
PMIC fuel gauge would need more than 100 points to describe the pack with
the generic property. Raise the cap to 128.

Assisted-by: LLM
Signed-off-by: Ryan Brue <ryanbrue.dev@xxxxxxxxx>
---
No kernel change goes with this. power_supply_get_battery_info() sizes each
ocv-capacity-table-N from the property itself -- it reads the length with
fwnode_property_count_u32() and devm_kcalloc()s that many entries -- so
maxItems in the binding is the only cap on points per table.
POWER_SUPPLY_OCV_TEMP_MAX bounds the number of tables, not their length.

The consumer that wants this is an MT6397 PMIC fuel gauge not yet posted;
its pack is characterised at 126 points per temperature in the vendor's
kernel (Amazon Fire OS, based on Linux 3.18), with 122 of those points
being expressible with the generic property (the rest are greater than
100%).
---
 Documentation/devicetree/bindings/power/supply/battery.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/power/supply/battery.yaml b/Documentation/devicetree/bindings/power/supply/battery.yaml
index 8ebf05d9497c..a6d4822f591c 100644
--- a/Documentation/devicetree/bindings/power/supply/battery.yaml
+++ b/Documentation/devicetree/bindings/power/supply/battery.yaml
@@ -154,7 +154,7 @@ patternProperties:
       of the battery and corresponding battery capacity percent, which is used
       to look up battery capacity according to current OCV value. And the open
       circuit voltage unit is microvolt.
-    maxItems: 100
+    maxItems: 128
     items:
       items:
         - description: open circuit voltage (OCV) in microvolts

---
base-commit: fd73f4a6659897191fa0d40695fe370925dd3780
change-id: 20260917-rbrue-suez-upstreaming-battery-ocv-table-128-9ba83f9313bb

Best regards,
--  
Ryan Brue <ryanbrue.dev@xxxxxxxxx>