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dt-bindings: leds: bcm63138: Add shift register bits

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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@linaro.org>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241010-bcm63138-leds-v4-1-cdb80780a555@linaro.org
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Linus Walleij 2024-10-10 16:10:50 +02:00 committed by Lee Jones
parent 42507413bb
commit d19261ffd0
1 changed files with 11 additions and 0 deletions
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11
Documentation/devicetree/bindings/leds/leds-bcm63138.yaml
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@ -41,6 +41,16 @@ properties:
"#size-cells":
const: 0
brcm,serial-shift-bits:
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. If left unspecified, the hardware boot-time default is used.
patternProperties:
"^led@[a-f0-9]+$":
type: object
@ -71,6 +81,7 @@ examples:
leds@ff800800 {
compatible = "brcm,bcm4908-leds", "brcm,bcm63138-leds";
reg = <0xff800800 0xdc>;
brcm,serial-shift-bits = <16>;
#address-cells = <1>;
#size-cells = <0>;