linux-kernel - Re: [PATCH v2 1/2] dt: bindings: lm3601x: Introduce the lm3601x driver

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Message-ID: <20180510112807.GF6977@amd>
Date:   Thu, 10 May 2018 13:28:07 +0200
From:   Pavel Machek <pavel@....cz>
To:     Dan Murphy <dmurphy@...com>
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        jacek.anaszewski@...il.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt: bindings: lm3601x: Introduce the lm3601x
 driver

On Tue 2018-05-08 09:17:03, 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>
> ---
> 
> v2 - No changes - https://patchwork.kernel.org/patch/10384587/
> 
>  .../devicetree/bindings/leds/leds-lm3601x.txt | 51 +++++++++++++++++++
>  1 file changed, 51 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..38cdabf6ca7e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-lm3601x.txt
> @@ -0,0 +1,51 @@
> +* Texas Instruments - lm3601x Single-LED Flash Driver
> +
> +The LM3601X are ultra-small LED flash drivers that
> +provides a high level of adjustability.

"provide".

> +Required properties:
> +	- compatible : Can be one of the following
> +		"ti,lm3601x"
> +		"ti,lm36010"
> +		"ti,lm36011"
> +	- reg : I2C slave address
> +	- #address-cells : 1
> +	- #size-cells : 0
> +
> +Required child properties:
> +	- reg : 0 - Indicates to support and register a torch interface
> +		1 - Indicates to support and register a strobe interface
> +		2 - Indicates to support and register an ir interface

I'd delete "to support and register" -- we are describing hardware here.

> +Optional child properties:
> +	- label : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +led-controller@64 {
> +	compatible = "ti,lm3601x";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	reg = <0x64>;
> +
> +	led@0 {
> +		reg = <0>;
> +		label = "white:torch";
> +		led-max-microamp=<10000>;
> +	};
> +
> +	led@1 {
> +		reg = <1>;
> +		label = "white:strobe";
> +		flash-max-microamp=<10000>;
> +		flash-max-timeout-us=<800>;
> +	};
> +
> +	led@2 {
> +		reg = <2>;
> +		label = "invisible:ir";
> +	};
> +}

Title says this is single-LED driver chip, but it controls three chips
in this example?

I'd put " " around "=" for consistency.

We use "flash" elsewhere, I'd replace "strobe" with that. Userspace
would like consistency, too.

What is the IR led good for? Taking videos in the dark?

I guess for consistency, it is "ir:torch" :-).

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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