linux-kernel - Re: [PATCH] drivers: led: is31fl319x: 6/9-channel light effect led driver

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Message-ID: <20160421150100.GA28324@rob-hp-laptop>
Date:	Thu, 21 Apr 2016 10:01:00 -0500
From:	Rob Herring <robh@...nel.org>
To:	"H. Nikolaus Schaller" <hns@...delico.com>
Cc:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Richard Purdie <rpurdie@...ys.net>,
	Jacek Anaszewski <j.anaszewski@...sung.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org, kernel@...a-handheld.com,
	marek@...delico.com, letux-kernel@...nphoenux.org
Subject: Re: [PATCH] drivers: led: is31fl319x: 6/9-channel light effect led
 driver

On Mon, Apr 18, 2016 at 08:43:16PM +0200, H. Nikolaus Schaller wrote:
> This is a driver for the Integrated Silicon Solution Inc. LED driver
> chips IS31FL3196 and IS31FL3199. They can drive up to 6 or 9
> LEDs.
> 
> Each LED is individually controllable in brightness (through pwm)
> in 256 steps so that RGB LEDs can show any of ca. 16 Mio colors.
> 
> The maximum current of the LEDs can be programmed and limited to
> 5 .. 40mA through a device tree property.
> 
> The chip is connected through I2C and can have one of 4 addresses (0x64 .. 0x67)
> depending on how the AD pin is connected. The address is defined by the
> reg property as usual.
> 
> The chip also has a shutdown input which could be connected to a GPIO,
> but this driver uses software shutdown if all LEDs are inactivated.
> 
> The chip also has breathing and audio features which are not supported
> by this driver.
> 
> This driver was developed and tested on OMAP5 based Pyra handheld prototype.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>  .../devicetree/bindings/leds/is31fl319x.txt        |  41 +++
>  drivers/leds/Kconfig                               |   8 +
>  drivers/leds/Makefile                              |   1 +
>  drivers/leds/leds-is31fl319x.c                     | 406 +++++++++++++++++++++
>  include/linux/leds-is31fl319x.h                    |  24 ++
>  5 files changed, 480 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/is31fl319x.txt
>  create mode 100644 drivers/leds/leds-is31fl319x.c
>  create mode 100644 include/linux/leds-is31fl319x.h
> 
> diff --git a/Documentation/devicetree/bindings/leds/is31fl319x.txt b/Documentation/devicetree/bindings/leds/is31fl319x.txt
> new file mode 100644
> index 0000000..d13c7ca
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/is31fl319x.txt
> @@ -0,0 +1,41 @@
> +LEDs connected to is31fl319x RGB LED controller chip
> +
> +Required properties:
> +- compatible : should be : "issi,is31fl3196" or "issi,is31fl3199".

One per line please.

> +- #address-cells: must be 1
> +- #size-cells: must be 0
> +- reg: 0x64, 0x65, 0x66, 0x67.
> +
> +Optional properties:
> +- max-current-ma:	maximum led current (5..40 mA, default 20 mA)

Use standard property led-max-microamp.

> +- audio-gain-db:	audio gain selection (0..21 dB. default 0 dB)
> +- breathing & audio:	not implemented
> +
> +Each led is represented as a sub-node of the issi,is31fl319x device.
> +
> +LED sub-node properties:
> +- label : (optional) see Documentation/devicetree/bindings/leds/common.txt
> +- reg : number of LED line (0 to 5 or 0 to 8 - not all need to be present)
> +- linux,default-trigger : (optional)
> +   see Documentation/devicetree/bindings/leds/common.txt
> +
> +Examples:
> +
> +fancy_leds: is31fl3196@65 {
> +	compatible = "issi,is31fl319x";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	reg = <0x65>;
> +
> +	led0: red-aux@0 {

Use generic unit names:

red-aux: led@0

> +		label = "red:aux";
> +		reg = <0>;
> +	};
> +
> +	led1: green-power@4 {

ditto

> +		label = "green:power";
> +		reg = <4>;
> +		linux,default-trigger = "default-on";
> +	};
> +};
> +