The BCM63138 family of serial LED controllers has a register
where we can set up bits for the shift registers. These are
the number of rounds the bits need to be shifted before all
bits have been shifted through the external shift registers.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
Documentation/devicetree/bindings/leds/leds-bcm63138.yaml | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Documentation/devicetree/bindings/leds/leds-bcm63138.yaml b/Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
index bb20394fca5c..d27148279ead 100644
--- a/Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
+++ b/Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
@@ -41,6 +41,18 @@ properties:
"#size-cells":
const: 0
+ brcm,serial-shift-bits:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 32
+ description:
+ This describes the number of 8-bit serial shifters
+ connected to the LED controller block. The hardware
+ is typically using 8-bit shift registers with 8 LEDs
+ per shift register, so 4 shifters results in 32 LEDs
+ or 2 shifters give 16 LEDs etc, but the hardware
+ supports any odd number of registers.
+
patternProperties:
"^led@[a-f0-9]+$":
type: object
@@ -71,6 +83,7 @@ examples:
leds@ff800800 {
compatible = "brcm,bcm4908-leds", "brcm,bcm63138-leds";
reg = <0xff800800 0xdc>;
+ brcm,serial-shift-bits = <16>;
#address-cells = <1>;
#size-cells = <0>;
--
2.46.0
