TI LMU (Lighting Management Unit) device tree bindings
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TI LMU driver supports lighting devices below.
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Name Child nodes
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------ ---------------------------------
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LM3631 Backlight and regulator
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LM3632 Backlight and regulator
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LM3633 Backlight, LED and fault monitor
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LM3695 Backlight
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LM36274 Backlight and regulator
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Required properties:
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- compatible: Should be one of:
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"ti,lm3631"
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"ti,lm3632"
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"ti,lm3633"
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"ti,lm3695"
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"ti,lm36274"
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- reg: I2C slave address.
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0x11 for LM3632
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0x29 for LM3631
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0x36 for LM3633
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0x63 for LM3695
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0x11 for LM36274
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Optional properties:
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- enable-gpios: A GPIO specifier for hardware enable pin.
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- ramp-up-us: Current ramping from one brightness level to
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the a higher brightness level.
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Range from 2048 us - 117.44 s
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- ramp-down-us: Current ramping from one brightness level to
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the a lower brightness level.
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Range from 2048 us - 117.44 s
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- ti,brightness-resolution - This determines whether to use 8 bit brightness
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mode or 11 bit brightness mode. If this value is
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not set the device is defaulted to the preferred
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8bit brightness mode per 7.3.4.1 of the data
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sheet. This setting can either be in the parent
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node or as part of the LED child nodes. This
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is determined by the part itself if the strings
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have a common brightness register or individual
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brightness registers.
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The values are 255 (8bit) or 2047 (11bit).
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Required node:
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- backlight: All LMU devices have backlight child nodes.
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For the properties, please refer to [1].
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Optional nodes:
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- fault-monitor: Hardware fault monitoring driver for LM3633 and LM3697.
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Required properties:
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- compatible: Should be one of:
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"ti,lm3633-fault-monitor"
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- leds: LED properties for LM3633. Please refer to [2].
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LED properties for LM36274. Please refer to [4].
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- regulators: Regulator properties for LM3631 and LM3632.
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Please refer to [3].
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[1] ../leds/backlight/ti-lmu-backlight.txt
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[2] ../leds/leds-lm3633.txt
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[3] ../regulator/lm363x-regulator.txt
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[4] ../leds/leds-lm36274.txt
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lm3631@29 {
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compatible = "ti,lm3631";
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reg = <0x29>;
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regulators {
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compatible = "ti,lm363x-regulator";
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vboost {
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regulator-name = "lcd_boost";
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regulator-min-microvolt = <4500000>;
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regulator-max-microvolt = <6350000>;
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regulator-always-on;
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};
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vcont {
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regulator-name = "lcd_vcont";
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <3300000>;
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};
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voref {
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regulator-name = "lcd_voref";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6000000>;
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};
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vpos {
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regulator-name = "lcd_vpos";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6000000>;
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regulator-boot-on;
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};
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vneg {
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regulator-name = "lcd_vneg";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6000000>;
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regulator-boot-on;
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};
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};
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backlight {
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compatible = "ti,lm3631-backlight";
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lcd_bl {
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led-sources = <0 1>;
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ramp-up-us = <300000>;
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};
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};
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};
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lm3632@11 {
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compatible = "ti,lm3632";
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reg = <0x11>;
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enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>; /* PC2 */
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regulators {
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compatible = "ti,lm363x-regulator";
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enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
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<&pioC 1 GPIO_ACTIVE_HIGH>;
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vboost {
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regulator-name = "lcd_boost";
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regulator-min-microvolt = <4500000>;
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regulator-max-microvolt = <6400000>;
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regulator-always-on;
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};
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vpos {
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regulator-name = "lcd_vpos";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6000000>;
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};
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vneg {
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regulator-name = "lcd_vneg";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6000000>;
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};
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};
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backlight {
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compatible = "ti,lm3632-backlight";
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pwms = <&pwm0 0 10000 0>; /* pwm number, period, polarity */
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pwm-names = "lmu-backlight";
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lcd {
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led-sources = <0 1>;
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pwm-period = <10000>;
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};
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};
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};
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lm3633@36 {
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compatible = "ti,lm3633";
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reg = <0x36>;
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enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
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backlight {
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compatible = "ti,lm3633-backlight";
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main {
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label = "main_lcd";
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led-sources = <1 2>;
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ramp-up-us = <500000>;
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ramp-down-us = <500000>;
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};
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front {
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label = "front_lcd";
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led-sources = <0>;
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ramp-up-us = <1000000>;
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ramp-down-us = <0>;
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};
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};
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leds {
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compatible = "ti,lm3633-leds";
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chan1 {
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label = "status";
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led-sources = <1>;
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led-max-microamp = <6000>;
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};
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chan345 {
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label = "rgb";
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led-sources = <3 4 5>;
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led-max-microamp = <10000>;
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};
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};
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fault-monitor {
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compatible = "ti,lm3633-fault-monitor";
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};
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};
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lm3695@63 {
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compatible = "ti,lm3695";
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reg = <0x63>;
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enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
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backlight {
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compatible = "ti,lm3695-backlight";
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lcd {
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label = "bl";
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led-sources = <0 1>;
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};
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};
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};
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lm36274@11 {
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compatible = "ti,lm36274";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x11>;
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enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
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regulators {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "ti,lm363x-regulator";
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enable-gpios = <&pioC 0 GPIO_ACTIVE_HIGH>,
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<&pioC 1 GPIO_ACTIVE_HIGH>;
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vboost {
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regulator-name = "lcd_boost";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <7150000>;
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regulator-always-on;
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};
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vpos {
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regulator-name = "lcd_vpos";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6500000>;
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};
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vneg {
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regulator-name = "lcd_vneg";
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regulator-min-microvolt = <4000000>;
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regulator-max-microvolt = <6500000>;
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};
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};
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backlight {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "ti,lm36274-backlight";
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led@0 {
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reg = <0>;
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led-sources = <0 2>;
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label = "white:backlight_cluster";
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linux,default-trigger = "backlight";
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};
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};
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};
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