power: supply: gpio-charger: add charge-current-limit feature

Add new charge-current-limit feature to gpio-charger.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
index 6244b8ee9402..89f8e2bcb2d7 100644
--- a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
+++ b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
@@ -39,6 +39,25 @@ properties:
     maxItems: 1
     description: GPIO indicating the charging status
 
+  charge-current-limit-gpios:
+    minItems: 1
+    maxItems: 32
+    description: GPIOs used for current limiting
+
+  charge-current-limit-mapping:
+    description: List of tuples with current in uA and a GPIO bitmap (in
+      this order). The tuples must be provided in descending order of the
+      current limit.
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    items:
+      items:
+        - description:
+            Current limit in uA
+        - description:
+            Encoded GPIO setting. Bit 0 represents last GPIO from the
+            charge-current-limit-gpios property. Bit 1 second to last
+            GPIO and so on.
+
 required:
   - compatible
 
@@ -47,6 +66,12 @@ anyOf:
       - gpios
   - required:
       - charge-status-gpios
+  - required:
+      - charge-current-limit-gpios
+
+dependencies:
+  charge-current-limit-gpios: [ charge-current-limit-mapping ]
+  charge-current-limit-mapping: [ charge-current-limit-gpios ]
 
 additionalProperties: false
 
@@ -60,4 +85,10 @@ examples:
 
       gpios = <&gpd 28 GPIO_ACTIVE_LOW>;
       charge-status-gpios = <&gpc 27 GPIO_ACTIVE_LOW>;
+
+      charge-current-limit-gpios = <&gpioA 11 GPIO_ACTIVE_HIGH>,
+                                   <&gpioA 12 GPIO_ACTIVE_HIGH>;
+      charge-current-limit-mapping = <2500000 0x00>, // 2.5 A => both GPIOs low
+                                     <700000 0x01>, // 700 mA => GPIO A.12 high
+                                     <0 0x02>; // 0 mA => GPIO A.11 high
     };