linux-kernel - Re: [PATCH v7 2/3] leds: ktd2692: add device tree bindings for ktd2692

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Date:	Fri, 24 Apr 2015 15:29:36 +0200
From:	Jacek Anaszewski <j.anaszewski81@...il.com>
To:	Ingi Kim <ingi2.kim@...sung.com>
Cc:	sakari.ailus@....fi, j.anaszewski@...sung.com,
	varkabhadram@...il.com, joe@...ches.com, sw0312.kim@...sung.com,
	cw00.choi@...sung.com, jh80.chung@...sung.com,
	ideal.song@...sung.com, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v7 2/3] leds: ktd2692: add device tree bindings for
 ktd2692

On Thu, 23 Apr 2015 22:18:04 +0900
Hi Ingi,

Ingi Kim <ingi2.kim@...sung.com> wrote:

> This patch adds the device tree bindings for ktd2692 flash LEDs.
> Add Optional properties of child node for Flash LED
> 
> Signed-off-by: Ingi Kim <ingi2.kim@...sung.com>
> Acked-by: Seung-Woo Kim <sw0312.kim@...sung.com>
> ---
>  .../devicetree/bindings/leds/leds-ktd2692.txt      | 47
> ++++++++++++++++++++++ 1 file changed, 47 insertions(+)
>  create mode 100644
> Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt new file
> mode 100644 index 0000000..708f2d4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-ktd2692.txt
> @@ -0,0 +1,47 @@
> +* Kinetic Technologies - KTD2692 Flash LED Driver
> +
> +KTD2692 is the ideal power solution for high-power flash LEDs.
> +It uses ExpressWire single-wire programming for maximum flexibility.
> +
> +The ExpressWire interface through CTRL pin can control LED on/off and
> +enable/disable the IC, Movie(max 1/3 of Flash current) / Flash mode
> current, +Flash timeout, LVP(low voltage protection).
> +
> +Also, When the AUX pin is pulled high while CTRL pin is high,
> +LED current will be ramped up to the flash-mode current level.
> +
> +Required properties:
> +- compatible: "kinetic,ktd2692"
> +- ctrl-gpio : gpio pin in order control CTRL pin
> +- aux-gpio : gpio pin in order control AUX pin
> +
> +Optional properties:
> +- vin-supply : "vin" LED supply (2.7V to 5.5V)
> +  See Documentation/devicetree/bindings/regulator/regulator.txt
> +
> +A discrete LED element connected to the device must be represented
> by a child +node - see
> Documentation/devicetree/bindings/leds/common.txt. +
> +Required properties for flash LED child nodes:
> +  See Documentation/devicetree/bindings/leds/common.txt
> +- flash-max-microamp : Flash LED maximum current
> +  Formula : I(mA) = 15000 / Rset
> +- flash-max-timeout-us : Flash LED maximum timeout

Patch [1] makes the led-max-microamp property mandatory for
the LEDs with configurable current for non-flash modes.

It hasn't been merged yet as we are waiting for ack from DT maintainer.


> +
> +Optional properties for flash LED child nodes:
> +- label : see Documentation/devicetree/bindings/leds/common.txt
> +
> +Example:
> +
> +ktd2692 {
> +	compatible = "kinetic,ktd2692";
> +	ctrl-gpio = <&gpc0 1 0>;
> +	aux-gpio = <&gpc0 2 0>;
> +	vin-supply = <&vbat>;
> +
> +	flash-led {
> +		label = "ktd2692-flash";
> +		flash-max-microamp = <1500000>;
> +		flash-max-timeout-us = <1835000>;
> +	};
> +};

[1] [PATCH v6] DT: leds: Improve description of flash LEDs related
properties

-- 
Best Regards,
Jacek Anaszewski
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