linux-kernel - [PATCH v2 05/15] dt-bindings: backlight: Add Mediatek MT6370 backlight

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Date:   Mon, 13 Jun 2022 19:11:36 +0800
From:   ChiaEn Wu <peterwu.pub@...il.com>
To:     jic23@...nel.org, lars@...afoo.de, matthias.bgg@...il.com,
        lee.jones@...aro.org, daniel.thompson@...aro.org,
        jingoohan1@...il.com, pavel@....cz, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-fbdev@...r.kernel.org,
        szunichen@...il.com, ChiYuan Huang <cy_huang@...htek.com>
Subject: [PATCH v2 05/15] dt-bindings: backlight: Add Mediatek MT6370 backlight

From: ChiYuan Huang <cy_huang@...htek.com>

Add mt6370 backlight binding documentation.

Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
 .../backlight/mediatek,mt6370-backlight.yaml  | 107 ++++++++++++++++++
 1 file changed, 107 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 000000000000..25a05e607e83
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/mediatek,mt6370-backlight.yaml
@@ -0,0 +1,107 @@
+# 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@...htek.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-bit:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    enum: [0, 1, 2, 3]
+    description: |
+      The selection of the upper and lower bounds threshold of backlight
+      PWM resolution. If we choose selection 3 (6 bits), the variation of PWM
+      resolution needs over than 64 steps (2^6).
+      value mapping:
+        - 0: 1
+        - 1: 2
+        - 2: 4
+        - 3: 6
+
+  mediatek,bled-ovp-shutdown:
+    description: |
+      Enable the backlight shutdown when OVP level triggered
+    type: boolean
+
+  mediatek,bled-ovp-microvolt:
+    enum: [0, 1, 2, 3]
+    description: |
+      Backlight OVP level selection.
+      value mapping:
+        - 0: 17000000
+        - 1: 21000000
+        - 2: 25000000
+        - 3: 29000000
+
+  mediatek,bled-ocp-shutdown:
+    description: |
+      Enable the backlight shutdown when OCP level triggerred.
+    type: boolean
+
+  mediatek,bled-ocp-microamp:
+    enum: [0, 1, 2, 3]
+    description: |
+      Backlight OC level selection.
+      value mapping:
+        - 0: 900000
+        - 1: 1200000
+        - 2: 1500000
+        - 3: 1800000
+
+  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
-- 
2.25.1