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Commit 6ccc7435 authored by Dan Murphy's avatar Dan Murphy Committed by Jacek Anaszewski
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dt: lm3532: Add lm3532 dt doc and update ti_lmu doc 



Add the lm3532 device tree documentation.
Remove lm3532 device tree reference from the ti_lmu devicetree
documentation.

With the addition of the dedicated lm3532 documentation the device
can be removed from the ti_lmu.txt.

The reason for this is that the lm3532 dt documentation now defines
the ability to control LED output strings against different control
banks or groups multiple strings to be controlled by a single control
bank.

Another addition was for ALS lighting control and configuration.  The
LM3532 has a feature that can take in the ALS reading from 2 separate
ALS devices and adjust the brightness on the strings that are configured
to support this feature.

Finally the device specific properties were moved to the parent node
as these properties are not control bank configurable.  These include
the runtime ramp and the ALS configuration.

Signed-off-by: default avatarDan Murphy <dmurphy@ti.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Acked-for-MFD-by: default avatarLee Jones <lee.jones@linaro.org>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
parent 9e98c678

Documentation/devicetree/bindings/leds/leds-lm3532.txt

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+101 −0
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* Texas Instruments - lm3532 White LED driver with ambient light sensing

capability.



The LM3532 provides the 3 high-voltage, low-side current sinks. The device is

programmable over an I2C-compatible interface and has independent

current control for all three channels. The adaptive current regulation

method allows for different LED currents in each current sink thus allowing

for a wide variety of backlight and keypad applications.



The main features of the LM3532 include dual ambient light sensor inputs

each with 32 internal voltage setting resistors, 8-bit logarithmic and linear

brightness control, dual external PWM brightness control inputs, and up to

1000:1 dimming ratio with programmable fade in and fade out settings.



Required properties:

	- compatible : "ti,lm3532"

	- reg : I2C slave address

	- #address-cells : 1

	- #size-cells : 0



Optional properties:

	- enable-gpios : gpio pin to enable (active high)/disable the device.

	- ramp-up-us - The Run time ramp rates/step are from one current

		       set-point to another after the device has reached its

		       initial target set point from turn-on

	- ramp-down-us - The Run time ramp rates/step are from one current

			 set-point to another after the device has reached its

			 initial target set point from turn-on

	Range for ramp settings: 8us - 65536us



Optional properties if ALS mode is used:

	- ti,als-vmin - Minimum ALS voltage defined in Volts

	- ti,als-vmax - Maximum ALS voltage defined in Volts

	Per the data sheet the max ALS voltage is 2V and the min is 0V



	- ti,als1-imp-sel - ALS1 impedance resistor selection in Ohms

	- ti,als2-imp-sel - ALS2 impedance resistor selection in Ohms

	Range for impedance select: 37000 Ohms - 1190 Ohms

	Values above 37kohms will be set to the "High Impedance" setting



	- ti,als-avrg-time-us - Determines the length of time the device needs to

			  average the two ALS inputs.  This is only used if

			  the input mode is LM3532_ALS_INPUT_AVRG.

			     Range: 17920us - 2293760us

	- ti,als-input-mode - Determines how the device uses the attached ALS

			   devices.

			   0x00 - ALS1 and ALS2 input average

			   0x01 - ALS1 Input

			   0x02 - ALS2 Input

			   0x03 - Max of ALS1 and ALS2



Required child properties:

	- reg : Indicates control bank the LED string is controlled by

	- led-sources : see Documentation/devicetree/bindings/leds/common.txt

	- ti,led-mode : Defines if the LED strings are manually controlled or

			if the LED strings are controlled by the ALS.

			0x00 - LED strings are I2C controlled via full scale

			       brightness control register

			0x01 - LED strings are ALS controlled



Optional LED child properties:

	- label : see Documentation/devicetree/bindings/leds/common.txt

	- linux,default-trigger :

	   see Documentation/devicetree/bindings/leds/common.txt



Example:

led-controller@38 {

	compatible = "ti,lm3532";

	#address-cells = <1>;

	#size-cells = <0>;

	reg = <0x38>;



	enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;

	ramp-up-us = <1024>;

	ramp-down-us = <65536>;



	ti,als-vmin = <0>;

	ti,als-vmax = <2000>;

	ti,als1-imp-sel = <4110>;

	ti,als2-imp-sel = <2180>;

	ti,als-avrg-time-us = <17920>;

	ti,als-input-mode = <0x00>;



	led@0 {

		reg = <0>;

		led-sources = <2>;

		ti,led-mode = <1>;

		label = ":backlight";

		linux,default-trigger = "backlight";

	};



	led@1 {

		reg = <1>;

		led-sources = <1>;

		ti,led-mode = <0>;

		label = ":kbd_backlight";

	};

};



For more product information please see the links below:

http://www.ti.com/product/LM3532

Documentation/devicetree/bindings/mfd/ti-lmu.txt

+0 −20
Original line number Diff line number Diff line
@@ -4,7 +4,6 @@ TI LMU driver supports lighting devices below. 


   Name                  Child nodes

  ------      ---------------------------------

  LM3532       Backlight

  LM3631       Backlight and regulator

  LM3632       Backlight and regulator

  LM3633       Backlight, LED and fault monitor
@@ -13,7 +12,6 @@ TI LMU driver supports lighting devices below. 


Required properties:

  - compatible: Should be one of:

                "ti,lm3532"

                "ti,lm3631"

                "ti,lm3632"

                "ti,lm3633"
@@ -23,7 +21,6 @@ Required properties: 
         0x11 for LM3632

         0x29 for LM3631

         0x36 for LM3633, LM3697

         0x38 for LM3532

         0x63 for LM3695



Optional property:
@@ -47,23 +44,6 @@ Optional nodes: 
[2] ../leds/leds-lm3633.txt

[3] ../regulator/lm363x-regulator.txt



lm3532@38 {

	compatible = "ti,lm3532";

	reg = <0x38>;



	enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;



	backlight {

		compatible = "ti,lm3532-backlight";



		lcd {

			led-sources = <0 1 2>;

			ramp-up-msec = <30>;

			ramp-down-msec = <0>;

		};

	};

};



lm3631@29 {

	compatible = "ti,lm3631";

	reg = <0x29>;