linux-kernel - [PATCHv2 1/2] dt-bindings: backlight: add ti-lmu-backlight binding

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Date:   Mon, 17 Jul 2017 15:39:55 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Sebastian Reichel <sre@...nel.org>, Milo Kim <Milo.Kim@...com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
Cc:     Jingoo Han <jingoohan1@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
        Milo Kim <milo.kim@...com>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Subject: [PATCHv2 1/2] dt-bindings: backlight: add ti-lmu-backlight binding

From: Milo Kim <Milo.Kim@...com>

Add DT binding for ti-lmu devices.

Signed-off-by: Milo Kim <milo.kim@...com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
---
 .../bindings/leds/backlight/ti-lmu-backlight.txt   | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt

diff --git a/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
new file mode 100644
index 000000000000..5fb1458a9136
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/ti-lmu-backlight.txt
@@ -0,0 +1,66 @@
+TI LMU backlight device tree bindings
+
+Required property:
+ - compatible: Should be one of:
+        "ti,lm3532-backlight"
+        "ti,lm3631-backlight"
+        "ti,lm3632-backlight"
+        "ti,lm3633-backlight"
+        "ti,lm3695-backlight"
+        "ti,lm3697-backlight"
+
+Optional properties:
+ There are two backlight control mode. One is I2C, the other is PWM mode.
+ Following properties are only specified in PWM mode.
+ Please note that LMU backlight device can have only one PWM channel.
+
+ - pwms: OF device-tree PWM specification.
+ - pwm-names: a list of names for the PWM devices specified in the "pwms"
+              property.
+
+ For the PWM user nodes, please refer to [1].
+
+Child nodes:
+ LMU backlight is represented as sub-nodes of the TI LMU device [2].
+ So, LMU backlight should have more than one backlight child node.
+ Each node exactly matches with backlight control bank configuration.
+ Maximum numbers of child nodes depend on the device.
+
+ 1 = LM3631, LM3632, LM3695
+ 2 = LM3633, LM3697
+ 3 = LM3532
+
+ Required property of a child node:
+ - led-sources: List of enabled channels from 0 to 2.
+                Please refer to LED binding [3].
+                For output channels, please refer to the datasheets [4].
+
+ Optional properties of a child node:
+ - label: Backlight channel identification.
+          Please refer to LED binding [3].
+ - default-brightness-level: Backlight initial brightness value.
+                             Type is <u32>. It is set as soon as backlight
+                             device is created.
+                             0 ~ 2047 = LM3631, LM3632, LM3633, LM3695 and
+                                        LM3697
+                             0 ~ 255  = LM3532
+ - ramp-up-msec, ramp-down-msec: Light dimming effect properties.
+                                 Type is <u32>. Unit is millisecond.
+                                 0 ~ 65 msec    = LM3532
+                                 0 ~ 4000 msec  = LM3631
+                                 0 ~ 16000 msec = LM3633 and LM3697
+ - pwm-period: PWM period. Only valid in PWM brightness mode.
+               Type is <u32>. If this property is missing, then control
+               mode is set to I2C by default.
+
+Examples: Please refer to ti-lmu dt-bindings. [2].
+
+[1] ../pwm/pwm.txt
+[2] ../mfd/ti-lmu.txt
+[3] ../leds/common.txt
+[4] LM3532: http://www.ti.com/product/LM3532/datasheet
+    LM3631: http://www.ti.com/product/LM3631/datasheet
+    LM3632: http://www.ti.com/product/LM3632A/datasheet
+    LM3633: http://www.ti.com/product/LM3633/datasheet
+    LM3695: Datasheet is not opened yet, but only two strings are used.
+    LM3697: http://www.ti.com/product/LM3697/datasheet
-- 
2.13.2