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