# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/richtek,rt8515.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Richtek RT8515 1.5A dual channel LED driver
maintainers:
- Linus Walleij <[email protected]>
description: |
The Richtek RT8515 is a dual channel (two mode) LED driver that
supports driving a white LED in flash or torch mode. The maximum
current for each mode is defined in hardware using two resistors
RFS and RTS.
properties:
compatible:
const: richtek,rt8515
enf-gpios:
maxItems: 1
description: A connection to the 'ENF' (enable flash) pin.
ent-gpios:
maxItems: 1
description: A connection to the 'ENT' (enable torch) pin.
richtek,rfs-ohms:
minimum: 7680
maximum: 367000
description: The resistance value of the RFS resistor. This
resistors limits the maximum flash current. This must be set
for the property flash-max-microamp to work, the RFS resistor
defines the range of the dimmer setting (brightness) of the
flash LED.
richtek,rts-ohms:
minimum: 7680
maximum: 367000
description: The resistance value of the RTS resistor. This
resistors limits the maximum torch current. This must be set
for the property torch-max-microamp to work, the RTS resistor
defines the range of the dimmer setting (brightness) of the
torch LED.
led:
type: object
$ref: common.yaml#
properties:
function: true
color: true
flash-max-timeout-us: true
flash-max-microamp:
maximum: 700000
description: The maximum current for flash mode
is hardwired to the component using the RFS resistor to
ground. The maximum hardware current setting is calculated
according to the formula Imax = 5500 / RFS. The lowest
allowed resistance value is 7.86 kOhm giving an absolute
maximum current of 700mA. By setting this attribute in
the device tree, you can further restrict the maximum
current below the hardware limit. This requires the RFS
to be defined as it defines the maximum range.
led-max-microamp:
maximum: 700000
description: The maximum current for torch mode
is hardwired to the component using the RTS resistor to
ground. The maximum hardware current setting is calculated
according to the formula Imax = 5500 / RTS. The lowest
allowed resistance value is 7.86 kOhm giving an absolute
maximum current of 700mA. By setting this attribute in
the device tree, you can further restrict the maximum
current below the hardware limit. This requires the RTS
to be defined as it defines the maximum range.
additionalProperties: false
required:
- compatible
- ent-gpios
- enf-gpios
- led
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/leds/common.h>
led-controller {
compatible = "richtek,rt8515";
enf-gpios = <&gpio4 12 GPIO_ACTIVE_HIGH>;
ent-gpios = <&gpio4 13 GPIO_ACTIVE_HIGH>;
richtek,rfs-ohms = <16000>;
richtek,rts-ohms = <100000>;
led {
function = LED_FUNCTION_FLASH;
color = <LED_COLOR_ID_WHITE>;
flash-max-timeout-us = <250000>;
flash-max-microamp = <150000>;
led-max-microamp = <25000>;
};
};
...
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