[PATCH v2 1/3] dt-bindings: leds: rt8515: Support single-GPIO flash ICs with vin supply

[Rudraksha Gupta via B4 Relay <devnull+guptarud.gmail.com@kernel.org>]

From: Rudraksha Gupta <guptarud@gmail.com>

Some flash ICs use the same one-wire pulse-count protocol as the RT8515
but have only a single enable line for both flash and torch modes, plus
an optional input voltage supply (e.g. a GPIO-controlled fixed
regulator) that gates power to the chip.

Make ent-gpios optional and add a vin-supply property to support these
variants. Add a oneOf constraint requiring exactly one of ent-gpios or
vin-supply. Add a binding example showing the single-GPIO configuration
with an input supply.

Signed-off-by: Rudraksha Gupta <guptarud@gmail.com>
---
 .../devicetree/bindings/leds/richtek,rt8515.yaml   | 34 +++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml
index 0356371a6b01..ab3c5139132c 100644
--- a/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml
+++ b/Documentation/devicetree/bindings/leds/richtek,rt8515.yaml
@@ -15,6 +15,10 @@ description: |
   current for each mode is defined in hardware using two resistors
   RFS and RTS.
 
+  Some flash ICs use the same one-wire pulse-count protocol but have
+  only a single enable line for both flash and torch modes. For these
+  single-channel variants, only enf-gpios is needed.
+
 properties:
   compatible:
     const: richtek,rt8515
@@ -26,6 +30,11 @@ properties:
   ent-gpios:
     maxItems: 1
     description: A connection to the 'ENT' (enable torch) pin.
+      Not present on single-channel flash ICs that use only one enable
+      line for both flash and torch modes.
+
+  vin-supply:
+    description: Optional input supply for the flash IC.
 
   richtek,rfs-ohms:
     minimum: 7680
@@ -81,10 +90,15 @@ properties:
 
 required:
   - compatible
-  - ent-gpios
   - enf-gpios
   - led
 
+oneOf:
+  - required:
+      - ent-gpios
+  - required:
+      - vin-supply
+
 additionalProperties: false
 
 examples:
@@ -108,4 +122,22 @@ examples:
         };
     };
 
+  - |
+    /* Single-channel flash IC with input supply */
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    led-controller {
+        compatible = "richtek,rt8515";
+        enf-gpios = <&tlmm 3 GPIO_ACTIVE_HIGH>;
+        vin-supply = <&flash_reg>;
+        richtek,rfs-ohms = <16000>;
+
+        led {
+            function = LED_FUNCTION_FLASH;
+            color = <LED_COLOR_ID_WHITE>;
+            flash-max-timeout-us = <250000>;
+        };
+    };
+
 ...

-- 
2.53.0