| # 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 <linus.walleij@linaro.org> |
| |
| 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>; |
| }; |
| }; |
| |
| ... |
