richtek,rt8515.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/leds/richtek,rt8515.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Richtek RT8515 1.5A dual channel LED driver
    8 
    9 maintainers:
   10   - Linus Walleij <linus.walleij@linaro.org>
   11 
   12 description: |
   13   The Richtek RT8515 is a dual channel (two mode) LED driver that
   14   supports driving a white LED in flash or torch mode. The maximum
   15   current for each mode is defined in hardware using two resistors
   16   RFS and RTS.
   17 
   18 properties:
   19   compatible:
   20     const: richtek,rt8515
   21 
   22   enf-gpios:
   23     maxItems: 1
   24     description: A connection to the 'ENF' (enable flash) pin.
   25 
   26   ent-gpios:
   27     maxItems: 1
   28     description: A connection to the 'ENT' (enable torch) pin.
   29 
   30   richtek,rfs-ohms:
   31     minimum: 7680
   32     maximum: 367000
   33     description: The resistance value of the RFS resistor. This
   34       resistors limits the maximum flash current. This must be set
   35       for the property flash-max-microamp to work, the RFS resistor
   36       defines the range of the dimmer setting (brightness) of the
   37       flash LED.
   38 
   39   richtek,rts-ohms:
   40     minimum: 7680
   41     maximum: 367000
   42     description: The resistance value of the RTS resistor. This
   43       resistors limits the maximum torch current. This must be set
   44       for the property torch-max-microamp to work, the RTS resistor
   45       defines the range of the dimmer setting (brightness) of the
   46       torch LED.
   47 
   48   led:
   49     type: object
   50     $ref: common.yaml#
   51     properties:
   52       function: true
   53       color: true
   54       flash-max-timeout-us: true
   55 
   56       flash-max-microamp:
   57         maximum: 700000
   58         description: The maximum current for flash mode
   59           is hardwired to the component using the RFS resistor to
   60           ground. The maximum hardware current setting is calculated
   61           according to the formula Imax = 5500 / RFS. The lowest
   62           allowed resistance value is 7.86 kOhm giving an absolute
   63           maximum current of 700mA. By setting this attribute in
   64           the device tree, you can further restrict the maximum
   65           current below the hardware limit. This requires the RFS
   66           to be defined as it defines the maximum range.
   67 
   68       led-max-microamp:
   69         maximum: 700000
   70         description: The maximum current for torch mode
   71           is hardwired to the component using the RTS resistor to
   72           ground. The maximum hardware current setting is calculated
   73           according to the formula Imax = 5500 / RTS. The lowest
   74           allowed resistance value is 7.86 kOhm giving an absolute
   75           maximum current of 700mA. By setting this attribute in
   76           the device tree, you can further restrict the maximum
   77           current below the hardware limit. This requires the RTS
   78           to be defined as it defines the maximum range.
   79 
   80     additionalProperties: false
   81 
   82 required:
   83   - compatible
   84   - ent-gpios
   85   - enf-gpios
   86   - led
   87 
   88 additionalProperties: false
   89 
   90 examples:
   91   - |
   92     #include <dt-bindings/gpio/gpio.h>
   93     #include <dt-bindings/leds/common.h>
   94 
   95     led-controller {
   96         compatible = "richtek,rt8515";
   97         enf-gpios = <&gpio4 12 GPIO_ACTIVE_HIGH>;
   98         ent-gpios = <&gpio4 13 GPIO_ACTIVE_HIGH>;
   99         richtek,rfs-ohms = <16000>;
  100         richtek,rts-ohms = <100000>;
  101 
  102         led {
  103             function = LED_FUNCTION_FLASH;
  104             color = <LED_COLOR_ID_WHITE>;
  105             flash-max-timeout-us = <250000>;
  106             flash-max-microamp = <150000>;
  107             led-max-microamp = <25000>;
  108         };
  109     };
  110 
  111 ...

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