Initial commit; kernel source import

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Nathan
2025-04-06 23:50:55 -05:00
commit 25c6d769f4
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88pm860x-backlight bindings
Optional properties:
- marvell,88pm860x-iset: Current supplies on backlight device.
- marvell,88pm860x-pwm: PWM frequency on backlight device.
Example:
backlights {
backlight-0 {
marvell,88pm860x-iset = <4>;
marvell,88pm860x-pwm = <3>;
};
backlight-2 {
};

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lp855x bindings
Required properties:
- compatible: "ti,lp8550", "ti,lp8551", "ti,lp8552", "ti,lp8553",
"ti,lp8556", "ti,lp8557"
- reg: I2C slave address (u8)
- dev-ctrl: Value of DEVICE CONTROL register (u8). It depends on the device.
Optional properties:
- bl-name: Backlight device name (string)
- init-brt: Initial value of backlight brightness (u8)
- pwm-period: PWM period value. Set only PWM input mode used (u32)
- rom-addr: Register address of ROM area to be updated (u8)
- rom-val: Register value to be updated (u8)
Example:
/* LP8556 */
backlight@2c {
compatible = "ti,lp8556";
reg = <0x2c>;
bl-name = "lcd-bl";
dev-ctrl = /bits/ 8 <0x85>;
init-brt = /bits/ 8 <0x10>;
};
/* LP8557 */
backlight@2c {
compatible = "ti,lp8557";
reg = <0x2c>;
dev-ctrl = /bits/ 8 <0x41>;
init-brt = /bits/ 8 <0x0a>;
/* 4V OV, 4 output LED string enabled */
rom_14h {
rom-addr = /bits/ 8 <0x14>;
rom-val = /bits/ 8 <0xcf>;
};
};

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88pm860x-backlight bindings
Optional properties:
- maxim,max8925-dual-string: whether support dual string
Example:
backlights {
maxim,max8925-dual-string = <0>;
};

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pwm-backlight bindings
Required properties:
- compatible: "pwm-backlight"
- pwms: OF device-tree PWM specification (see PWM binding[0])
- brightness-levels: Array of distinct brightness levels. Typically these
are in the range from 0 to 255, but any range starting at 0 will do.
The actual brightness level (PWM duty cycle) will be interpolated
from these values. 0 means a 0% duty cycle (darkest/off), while the
last value in the array represents a 100% duty cycle (brightest).
- default-brightness-level: the default brightness level (index into the
array defined by the "brightness-levels" property)
Optional properties:
- pwm-names: a list of names for the PWM devices specified in the
"pwms" property (see PWM binding[0])
- enable-gpio: a GPIO used to enable the backlight.
Child device nodes describe alternate brightness-levels tables for different
display/backlight configurations.
[0]: Documentation/devicetree/bindings/pwm/pwm.txt
Example:
backlight {
compatible = "pwm-backlight";
pwms = <&pwm 0 5000000>;
brightness-levels = <0 4 8 16 32 64 128 255>;
default-brightness-level = <6>;
enable-gpio = <&gpx3 0 0>;
};
Alternate brightness-levels tables
Child device nodes can specify multiple alternate brightness-levels tables,
identified by a generic string, and is selected upon calling the backlight
device's brightness_choose().
Properties:
- compatible: "pwm-backlight-alt-brightness-levels"
- identifier: A string that is used during backlight_choose() to select the
particular alternate brightness-levels table.
- brightness-levels: See the brightness-levels property of the parent node,
described earlier in this documentation. Note that the length of these
alternate brightness-level tables must be the same as the original
brightness-levels table from the parent node.
Example:
panel@0 {
compatible = "pwm-backlight-alt-brightness-levels";
identifier = "CMN-1132-1"
brightness-levels = <0 16 32 40 80 120 160 255>;
};

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TPS65217 family of regulators
The TPS65217 chip contains a boost converter and current sinks which can be
used to drive LEDs for use as backlights.
Required properties:
- compatible: "ti,tps65217"
- reg: I2C slave address
- backlight: node for specifying WLED1 and WLED2 lines in TPS65217
- isel: selection bit, valid values: 1 for ISEL1 (low-level) and 2 for ISEL2 (high-level)
- fdim: PWM dimming frequency, valid values: 100, 200, 500, 1000
- default-brightness: valid values: 0-100
Each regulator is defined using the standard binding for regulators.
Example:
tps: tps@24 {
reg = <0x24>;
compatible = "ti,tps65217";
backlight {
isel = <1>; /* 1 - ISET1, 2 ISET2 */
fdim = <100>; /* TPS65217_BL_FDIM_100HZ */
default-brightness = <50>;
};
};