mfd: documentation: dt: Add documentation for the mfd Maxim max77693

This patch adds device tree binding documentation for
the flash cell of the Maxim max77693 multifunctional device.

Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/Documentation/devicetree/bindings/mfd/max77693.txt b/Documentation/devicetree/bindings/mfd/max77693.txt
index 38e64405e98d7407b5c3f145b9024942a5675609..d3425846aa5bf1ae865fbd143975459c08bf578c 100644 (file)
--- a/Documentation/devicetree/bindings/mfd/max77693.txt
+++ b/Documentation/devicetree/bindings/mfd/max77693.txt
@@ -76,7 +76,60 @@ Optional properties:
     Valid values: 4300000, 4700000, 4800000, 4900000
     Default: 4300000
 
+- 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,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 not enabled explicitly, boost setting defaults to
+       LEDS_BOOST_FIXED in case both current sources are used.
+       Possible values:
+               LEDS_BOOST_OFF (0) - no boost,
+               LEDS_BOOST_ADAPTIVE (1) - adaptive mode,
+               LEDS_BOOST_FIXED (2) - fixed mode.
+- maxim,boost-mvout : Output voltage of the boost module in millivolts.
+       Valid values: 3300 - 5500, step by 25 (rounded down)
+       Default: 3300
+- maxim,mvsys-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.
+       Valid values: 2400 - 3400, step by 33 (rounded down)
+       Default: 2400
+
+Required properties for the LED child node:
+- led-sources : see Documentation/devicetree/bindings/leds/common.txt;
+               device current output identifiers: 0 - FLED1, 1 - FLED2
+- led-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+       Valid values for a LED connected to one FLED output:
+               15625 - 250000, step by 15625 (rounded down)
+       Valid values for a LED connected to both FLED outputs:
+               15625 - 500000, step by 15625 (rounded down)
+- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+       Valid values for a single LED connected to one FLED output
+       (boost mode must be turned off):
+               15625 - 1000000, step by 15625 (rounded down)
+       Valid values for a single LED connected to both FLED outputs:
+               15625 - 1250000, step by 15625 (rounded down)
+       Valid values for two LEDs case:
+               15625 - 625000, step by 15625 (rounded down)
+- flash-max-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
+       Valid values: 62500 - 1000000, step by 62500 (rounded down)
+
+Optional properties for the LED child node:
+- label : see Documentation/devicetree/bindings/leds/common.txt
+
 Example:
+#include <dt-bindings/leds/common.h>
+
        max77693@66 {
                compatible = "maxim,max77693";
                reg = <0x66>;
@@ -117,5 +170,19 @@ Example:
                        maxim,thermal-regulation-celsius = <75>;
                        maxim,battery-overcurrent-microamp = <3000000>;
                        maxim,charge-input-threshold-microvolt = <4300000>;
+
+               led {
+                       compatible = "maxim,max77693-led";
+                       maxim,boost-mode = <LEDS_BOOST_FIXED>;
+                       maxim,boost-mvout = <5000>;
+                       maxim,mvsys-min = <2400>;
+
+                       camera_flash: flash-led {
+                               label = "max77693-flash";
+                               led-sources = <0>, <1>;
+                               led-max-microamp = <500000>;
+                               flash-max-microamp = <1250000>;
+                               flash-max-timeout-us = <1000000>;
+                       };
                };
        };