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Date: Thu, 4 Dec 2014 12:07:07 +0200
From: Sakari Ailus <sakari.ailus@....fi>
To: Jacek Anaszewski <j.anaszewski@...sung.com>
Cc: linux-leds@...r.kernel.org, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org, kyungmin.park@...sung.com,
b.zolnierkie@...sung.com, pavel@....cz, cooloney@...il.com,
rpurdie@...ys.net, s.nawrocki@...sung.com, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
Andrzej Hajda <a.hajda@...sung.com>,
Lee Jones <lee.jones@...aro.org>,
Chanwoo Choi <cw00.choi@...sung.com>,
devicetree@...r.kernel.org
Subject: Re: [PATCH/RFC v9 06/19] DT: Add documentation for the mfd Maxim
max77693
Hi Jacek,
On Wed, Dec 03, 2014 at 05:06:41PM +0100, Jacek Anaszewski wrote:
> This patch adds device tree binding documentation for
> the flash cell of the Maxim max77693 multifunctional device.
>
> Signed-off-by: Jacek Anaszewski <j.anaszewski@...sung.com>
> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: Chanwoo Choi <cw00.choi@...sung.com>
> Cc: Bryan Wu <cooloney@...il.com>
> Cc: Richard Purdie <rpurdie@...ys.net>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Ian Campbell <ijc+devicetree@...lion.org.uk>
> Cc: Kumar Gala <galak@...eaurora.org>
> Cc: <devicetree@...r.kernel.org>
> ---
> Documentation/devicetree/bindings/mfd/max77693.txt | 89 ++++++++++++++++++++
> 1 file changed, 89 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
> index 01e9f30..25a6e78 100644
> --- a/Documentation/devicetree/bindings/mfd/max77693.txt
> +++ b/Documentation/devicetree/bindings/mfd/max77693.txt
> @@ -41,7 +41,66 @@ Optional properties:
> To get more informations, please refer to documentaion.
> [*] refer Documentation/devicetree/bindings/pwm/pwm.txt
>
> +- led : the LED submodule device node
> +
> +There are two led outputs available - fled1 and fled2. Each of them can
> +control a separate led or they can be connected together to double
> +the maximum current for a single connected led. One led is represented
> +by one child node.
> +
> +Required properties:
> +- compatible : Must be "maxim,max77693-led".
> +
> +Optional properties:
> +- maxim,fleds : Array of current outputs in order: fled1, fled2.
> + Note: both current outputs can be connected to a single led
> + Possible values:
> + MAX77693_LED_FLED_UNUSED - the output is left disconnected,
> + MAX77693_LED_FLED_USED - a diode is connected to the output.
As you have a LED sub-nodes for each LED already, isn't this redundant?
> +- maxim,trigger-type : Array of trigger types in order: flash, torch.
> + Possible trigger types:
> + MAX77693_LED_TRIG_TYPE_EDGE - Rising edge of the signal triggers
> + the flash/torch,
> + MAX77693_LED_TRIG_TYPE_LEVEL - Signal level controls duration of
How about: "Strobe pulse length ..."?
How long does the torch stay on if you use edge trigger for it? I've always
thought the torch enable pin was a practical joke. :-)
If you need it this for torch as well, I'd use separate properties for the
purpose, i.e. trigger-type-flash and trigger-type-torch.
> + the flash/torch.
> +- maxim,trigger : Array of flags indicating which trigger can activate given led
> + in order: fled1, fled2.
> + Possible flag values (can be combined):
> + MAX77693_LED_TRIG_FLASHEN - FLASHEN pin of the chip,
> + MAX77693_LED_TRIG_TORCHEN - TORCHEN pin of the chip,
> + MAX77693_LED_TRIG_SOFTWARE - software via I2C command.
Is there a need to prevent strobing using a certain method? Just wondering.
> +- maxim,boost-mode :
> + In boost mode the device can produce up to 1.2A of total current
> + on both outputs. The maximum current on each output is reduced
> + to 625mA then. If there are two child led nodes defined then boost
> + is enabled by default.
> + Possible values:
> + MAX77693_LED_BOOST_OFF - no boost,
> + MAX77693_LED_BOOST_ADAPTIVE - adaptive mode,
> + MAX77693_LED_BOOST_FIXED - fixed mode.
> +- maxim,boost-vout : Output voltage of the boost module in millivolts.
> +- maxim,vsys-min : Low input voltage level in millivolts. Flash is not fired
> + if chip estimates that system voltage could drop below this level due
> + to flash power consumption.
> +
> +Required properties of the LED child node:
> +- label : see Documentation/devicetree/bindings/leds/common.txt
> +- maxim,fled_id : Identifier of the fled output the led is connected to;
I'm pretty sure this will be needed for about every chip that can drive
multiple LEDs. Shouldn't it be documented in the generic documentation?
> + MAX77693_LED_FLED1 - FLED1 output of the device - it has to be
> + used also if a single LED is connected to both outputs,
> + MAX77693_LED_FLED2 - FLED2 output of the device.
> +
> +Optional properties of the LED child node:
> +- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> + Range: 15625 - 250000
> +- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
> + Range: 15625 - 1000000
> +- flash-timeout-microsec : see Documentation/devicetree/bindings/leds/common.txt
> + Range: 62500 - 1000000
> +
> Example:
> +#include <dt-bindings/mfd/max77693.h>
> +
> max77693@66 {
> compatible = "maxim,max77693";
> reg = <0x66>;
> @@ -73,4 +132,34 @@ Example:
> pwms = <&pwm 0 40000 0>;
> pwm-names = "haptic";
> };
> +
> + led {
> + compatible = "maxim,max77693-led";
> + maxim,fleds = <MAX77693_LED_FLED_USED
> + MAX77693_LED_FLED_USED>;
> + maxim,trigger = <MAX77693_LED_TRIG_ALL
> + (MAX77693_LED_TRIG_TORCHEN |
> + MAX77693_LED_TRIG_SOFTWARE)>;
> + maxim,trigger-type = <MAX77693_LED_TRIG_TYPE_EDGE
> + MAX77693_LED_TRIG_TYPE_LEVEL>;
> + maxim,boost-mode = <MAX77693_LED_BOOST_ADAPTIVE>;
> + maxim,boost-vout = <5000>;
> + maxim,vsys-min = <2400>;
> +
> + camera1_flash: led1 {
> + maxim,fled_id = <MAX77693_LED_FLED1>;
> + label = "max77693-flash1";
> + max-microamp = <250000>;
> + flash-max-microamp = <625000>;
> + flash-timeout-microsec = <1000000>;
> + };
> +
> + camera2_flash: led2 {
> + maxim,fled_id = <MAX77693_LED_FLED2>;
> + label = "max77693-flash2";
> + max-microamp = <250000>;
> + flash-max-microamp = <500000>;
> + flash-timeout-microsec = <1000000>;
> + };
> + };
I like how this looks like in general.
> };
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@....fi XMPP: sailus@...iisi.org.uk
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