linux-kernel - Re: [PATCH v6 1/2] dt: bindings: lm3601x: Introduce the lm3601x driver

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Date:   Tue, 15 May 2018 16:29:08 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>, <pavel@....cz>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-leds@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] dt: bindings: lm3601x: Introduce the lm3601x
 driver

Jacek

On 05/15/2018 04:13 PM, Jacek Anaszewski wrote:
> Hi Dan,
> 
> Thanks for the update.
> 
> On 05/15/2018 05:43 PM, Dan Murphy wrote:
>> Introduce the device tree bindings for the lm3601x
>> family of LED torch, flash and IR drivers.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
>> ---
>>
>> v6 - Removed multiple led child nodes, fixed example to display micro ranges
>> for corresponding child nodes and added led-sources to define the current driver -
>> https://patchwork.kernel.org/patch/10392121/
>>
>> v5 - No changes - https://patchwork.kernel.org/patch/10391743/
>> v4 - Added " " around "=", changed strobe to flash on label, removed "support and
>> register" comment and change ir lable to ir:torch - See v2 patchworks for comments
>> v3 - Removed wildcard compatible - https://patchwork.kernel.org/patch/10386241/
>> v2 - No changes - https://patchwork.kernel.org/patch/10384587/
>>
>>   .../devicetree/bindings/leds/leds-lm3601x.txt | 47 +++++++++++++++++++
>>   1 file changed, 47 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3601x.txt
>>
>> diff --git a/Documentation/devicetree/bindings/leds/leds-lm3601x.txt b/Documentation/devicetree/bindings/leds/leds-lm3601x.txt
>> new file mode 100644
>> index 000000000000..27930a89e9a5
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/leds/leds-lm3601x.txt
>> @@ -0,0 +1,47 @@
>> +* Texas Instruments - lm3601x Single-LED Flash Driver
>> +
>> +The LM3601X are ultra-small LED flash drivers that
>> +provide a high level of adjustability.
>> +
>> +Required properties:
>> +    - compatible : Can be one of the following
>> +        "ti,lm36010"
>> +        "ti,lm36011"
>> +    - reg : I2C slave address
>> +    - #address-cells : 1
>> +    - #size-cells : 0
>> +
>> +Required child properties:
>> +    - reg : 0
>> +    - led-sources:    0 - Indicates a IR mode
>> +            1 - Indicates a Torch (white LED) mode
> 
> You don't need led-sources at all. Please use reg as in
> the previous version. led-sources is useful for describing
> more complex arrangements. Here reg will do.

OK.  Thought we would keep consistent with the max IC.

> 
>> +
>> +Required properties for flash LED child nodes:
>> +    See Documentation/devicetree/bindings/leds/common.txt
>> +    - flash-max-microamp : Range from 11mA -> 1.5A
>> +    - flash-max-timeout-us : Range from 40ms -> 1600ms
>> +    - led-max-microamp : Range from 2.4mA -> 376mA
> 
> Please give also a step in the format like below
> (taken from max77693):
> 
>     Valid values: 62500 - 1000000, step by 62500 (rounded down)

I would do this but the step is not linear.  The step is 40ms from 40 -> 400.
after that the step goes to 200ms from 400->1600.

same with the current ranges.

Dan

> 
> 
>> +
>> +Optional child properties:
>> +    - label : see Documentation/devicetree/bindings/leds/common.txt
>> +
>> +Example:
>> +led-controller@64 {
>> +    compatible = "ti,lm36010";
>> +    #address-cells = <1>;
>> +    #size-cells = <0>;
>> +    reg = <0x64>;
>> +
>> +    led@0 {
>> +        reg = <0>;
>> +        label = "white:torch";
>> +        led-max-microamp = <376000>;
>> +        flash-max-microamp = <1500000>;
>> +        flash-max-timeout-us = <1600000>;
>> +        led-sources = <1>;
>> +    };
>> +}
>> +
>> +For more product information please see the links below:
>> +http://www.ti.com/product/LM36010
>> +http://www.ti.com/product/LM36011
>>
> 


-- 
------------------
Dan Murphy