Jacek
On 08/15/2018 11:56 AM, Jacek Anaszewski wrote:
> Hi Dan,
>
> Thank you for the update.
>
> On 08/15/2018 06:17 PM, Dan Murphy wrote:
>> Add the device tree bindings for the lm3697
>> LED driver for backlighting and display.
>>
>> Signed-off-by: Dan Murphy <dmur...@ti.com>
>> ---
>>
>> v3 - Updated subject with prefered title -
>> https://lore.kernel.org/patchwork/patch/972337/
>> v2 - Fixed subject and patch commit message -
>> https://lore.kernel.org/patchwork/patch/971326/
>>
>> .../devicetree/bindings/leds/leds-lm3697.txt | 89 +++++++++++++++++++
>> 1 file changed, 89 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3697.txt
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-lm3697.txt
>> b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
>> new file mode 100644
>> index 000000000000..34403a48a0ce
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/leds-lm3697.txt
>> @@ -0,0 +1,89 @@
>> +* Texas Instruments - LM3697 Highly Efficient White LED Driver
>> +
>> +The LM3697 11-bit LED driver provides high-
>> +performance backlight dimming for 1, 2, or 3 series
>> +LED strings while delivering up to 90% efficiency.
>> +
>> +This device is suitable for Display and Keypad Lighting
>> +
>> +Required properties:
>> + - compatible:
>> + "ti,lm3967"
>> + - reg : I2C slave address
>> + - #address-cells : 1
>> + - #size-cells : 0
>> +
>> +Optional properties:
>> + - enable-gpios : gpio pin to enable/disable the device.
>> + - vled-supply : LED supply
>> +
>> +Required child properties:
>> + - reg : 0 - LED is Controlled by bank A
>> + 1 - LED is Controlled by bank B
>> + - led-sources - Indicates which HVLED string is associated to which
>> + control bank. The HVLED string cannot be associated
>> with
>> + two control banks. This property is an array of 3 and
>> + all positions in the array must be populated.
>> + Additional information is contained
>> + in Documentation/devicetree/bindings/leds/common.txt
>> + 0 - End of array if all 3 LEDs are not declared for a
>> + single control bank.
>
> This is needless complication. I propose to define led-sources as
> an array of three boolean values, whose state signifies which LED
> strings are controlled by the bank defined by the reg property in the
> given child node. I.e. <HVLED1 HVLED2 HVLED3>.
I struggled a bit with this definition. Once I got it working it ended up
producing
an overly complex control bank algorithm.
I will take a look at implementing the suggestion but the complication comes in
the
numerous DT configurations we could encounter. Part of the issue is that the
user
can connect to CTRL bank b only or CTRL bank a only or a combination of that
2^3
Dan
>
> I modified your examples below accordingly.
>
>> + 1 - HVLED 1 string
>> + 2 - HVLED 2 string
>> + 3 - HVLED 3 string
>> +
>> +Optional child properties:
>> + - label : see Documentation/devicetree/bindings/leds/common.txt
>> + - linux,default-trigger :
>> + see Documentation/devicetree/bindings/leds/common.txt
>> +
>> +Example:
>> +
>> +HVLED string 1 and 2 controlled by control bank A and HVLED string
>> controlled by
>> +control bank B.
>> +
>> +led-controller@36 {
>> + compatible = "ti,lm3967";
>> + reg = <0x36>;
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
>> + vled-supply = <&vbatt>;
>> +
>> + led@0 {
>> + reg = <0>;
>> + led-sources = <0x1 0x2 0x0>
>
> led-sources = <1 1 0>;
> ;
>> + label = "white:first_backlight_cluster";
>> + linux,default-trigger = "backlight";
>> + };
>> +
>> + led@1 {
>> + reg = <1>;
>> + led-sources = <0x3 0x0 0x0>;
>
> led-sources = <0 0 1>;
>
>> + label = "white:second_backlight_cluster";
>> + linux,default-trigger = "backlight";
>> + };
>> +}
>> +
>> +All HVLED strings controlled by control bank A
>> +
>> +led-controller@36 {
>> + compatible = "ti,lm3967";
>> + reg = <0x36>;
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> +
>> + enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
>> + vled-supply = <&vbatt>;
>> +
>> + led@0 {
>> + reg = <0>;
>> + led-sources = <0x1 0x2 0x3>;
>
> led-sources = <1 1 1>;
>
>> + label = "white:backlight_cluster";
>> + linux,default-trigger = "backlight";
>> + };
>> +}
>> +
>> +For more product information please see the link below:
>> +http://www.ti.com/lit/ds/symlink/lm3697.pdf
>>
>
--
------------------
Dan Murphy
