Re: [PATCH v3 05/14] dt-bindings: backlight: Add Mediatek MT6370 backlight

On Thu, Jun 23, 2022 at 07:56:22PM +0800, ChiaEn Wu wrote:

From: ChiYuan Huang cy_huang@richtek.com

Add mt6370 backlight binding documentation.

Signed-off-by: ChiYuan Huang cy_huang@richtek.com

v3

• Rename "mediatek,bled-pwm-hys-input-threshold-steps" to "mediatek,bled-pwm-hys-input-th-steps"
• Refine "bled-pwm-hys-input-th-steps", "bled-ovp-microvolt", "bled-ocp-microamp" enum values

---

.../leds/backlight/mediatek,mt6370-backlight.yaml | 92 ++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml

diff --git a/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml new file mode 100644 index 0000000..26563ae --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml @@ -0,0 +1,92 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/mediatek,mt6370-backlight.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml#

+title: Mediatek MT6370 Backlight

+maintainers:

• • ChiaEn Wu chiaen_wu@richtek.com

+description: |

• This module is part of the MT6370 MFD device.
• The MT6370 Backlight WLED driver supports up to a 29V output voltage for
• 4 channels of 8 series WLEDs. Each channel supports up to 30mA of current
• capability with 2048 current steps (11 bits) in exponential or linear
• mapping curves.

+allOf:

• • $ref: common.yaml#

+properties:

• compatible:
• const: mediatek,mt6370-backlight
• default-brightness:
• minimum: 0
• maximum: 2048
• max-brightness:
• minimum: 0
• maximum: 2048
• enable-gpios:
• description: External backlight 'enable' pin
• maxItems: 1
• mediatek,bled-pwm-enable:
• description: |

•  Enable external PWM input for backlight dimming
  

• type: boolean
• mediatek,bled-pwm-hys-enable:
• description: |

•  Enable the backlight input-hysteresis for PWM mode
  

• type: boolean
• mediatek,bled-pwm-hys-input-th-steps:
• $ref: /schemas/types.yaml#/definitions/uint8
• enum: [1, 4, 16, 64]
• description: |

•  The selection of the upper and lower bounds threshold of backlight
  

•  PWM resolution. If we choose selection 64, the variation of PWM
  

•  resolution needs over than 64 steps.
  

more than?

Thanks, Joe

• mediatek,bled-ovp-shutdown:
• description: |

•  Enable the backlight shutdown when OVP level triggered
  

• type: boolean
• mediatek,bled-ovp-microvolt:
• enum: [17000000, 21000000, 25000000, 29000000]
• description: |

•  Backlight OVP level selection.
  

• mediatek,bled-ocp-shutdown:
• description: |

•  Enable the backlight shutdown when OCP level triggerred.
  

• type: boolean
• mediatek,bled-ocp-microamp:
• enum: [900000, 1200000, 1500000, 1800000]
• description: |

•  Backlight OC level selection.
  

• mediatek,bled-channel-use:
• $ref: /schemas/types.yaml#/definitions/uint8
• description: |

•  Backlight LED channel to be used.
  

•  Each bit mapping to:
  

•    - 0: CH4
  

•    - 1: CH3
  

•    - 2: CH2
  

•    - 3: CH1
  

• minimum: 1
• maximum: 15

+required:

• • compatible
• • mediatek,bled-channel-use

+additionalProperties: false

2.7.4