linux-kernel - Re: [PATCH RESEND 02/16] Documentation: dt-bindings: backlight: add TI LMU backlight binding information

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Date:	Tue, 3 Nov 2015 16:13:08 +0900
From:	"Kim, Milo" <milo.kim@...com>
To:	Rob Herring <robh@...nel.org>
CC:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jingoo Han <jingoohan1@...il.com>
Subject: Re: [PATCH RESEND 02/16] Documentation: dt-bindings: backlight: add
 TI LMU backlight binding information


On 11/3/2015 12:02 AM, Rob Herring wrote:
> On Sun, Nov 1, 2015 at 11:24 PM, Milo Kim <milo.kim@...com> wrote:
>> LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697 use common dt-bindings
>> for describing device.
>>
>> Cc: devicetree@...r.kernel.org
>> Cc: Jingoo Han <jingoohan1@...il.com>
>> Cc: Lee Jones <lee.jones@...aro.org>
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Milo Kim <milo.kim@...com>
>> ---
>>   .../bindings/video/backlight/ti-lmu-backlight.txt  | 67 ++++++++++++++++++++++
>
> Please move to bindings/leds/backlight/

There are backlight bindings under video/backlight. I'd like to know why 
this 'led' location is preferred. My guess is most of properties are 
from common LED properties. Any other reasons?

>
>>   1 file changed, 67 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt
>>
>> diff --git a/Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt b/Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt
>> new file mode 100644
>> index 0000000..27b0036
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/video/backlight/ti-lmu-backlight.txt
>> @@ -0,0 +1,67 @@
>> +TI LMU backlight device tree bindings
>> +
>> +Required properties:
>> +  - compatible: Should be one of lists below.
>> +                "ti,lm3532-backlight"
>> +                "ti,lm3631-backlight"
>> +                "ti,lm3632-backlight"
>> +                "ti,lm3633-backlight"
>> +                "ti,lm3695-backlight"
>> +                "ti,lm3697-backlight"
>> +
>> +Optional properties:
>> +  There are two backlight control mode. One is I2C, the other is PWM mode.
>> +  Following properties are only specified in PWM mode.
>> +  Please note that LMU backlight device can have only one PWM channel.
>> +
>> +  - pwms: OF device-tree PWM specification.
>> +  - pwm-names: a list of names for the PWM devices specified in the "pwms"
>> +               property.
>> +
>> +  For the PWM user nodes, please refer to [1].
>> +
>> +Child nodes:
>> +  LMU backlight is represented as sub-nodes of the TI LMU device [2].
>> +  So, LMU backlight should have more than one backlight child node.
>> +  Each node exactly matches with backlight control bank configuration.
>> +  Maximum numbers of child nodes depend on the device.
>> +  1 = LM3631, LM3632, LM3695
>> +  2 = LM3633, LM3697
>> +  3 = LM3532
>> +
>> +  Required property of a child node:
>> +  - hvled1-used, hvled2-used, hvled3-used:
>> +    High voltage backlight strings configuration. Type is <boolean>.
>> +    Please describe which output backlight string is used.
>> +    Please refer to the datasheets [3].
>
> Use led-sources.

OK.

>
>> +
>> +  Optional properties of a child node:
>> +  - backlight-name: Name string for backlight device identification.
>> +                    It is used for creating backlight sysfs,
>> +                    /sys/class/backlight/<backlight-name>/.
>
> Use label.

Got it.

>
>> +  - backlight-max-microamp: Max current setting. Type is <u32>.
>> +                            Unit is microampere.
>> +                            Range is from 5000 to 30000.
>
> Use led-max-microamp

OK.

>
>> +  - initial-brightness: Backlight initial brightness value. Type is <u32>.
>> +                        It is set as soon as backlight device is created.
>> +                        0 ~ 2047 = LM3631, LM3632, LM3633, LM3695 and LM3697
>> +                        0 ~ 255  = LM3532
>
> Use default-brightness-level
>

I'll update the bindings and drivers based on your review. Many thanks!

Best regards,
Milo
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