ASoC: cs35l33: Add device tree bindings file for cs35l33

Add device tree bindings file for the cs35l33 8V boosted
class D amplifier.
Signed-off-by: Paul Handrigan <Paul.Handrigan@cirrus.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/cs35l33.txt

+CS35L33 Speaker Amplifier
+
+Required properties:
+
+  - compatible : "cirrus,cs35l33"
+
+  - reg : the I2C address of the device for I2C
+
+  - VA-supply, VP-supply : power supplies for the device,
+    as covered in
+    Documentation/devicetree/bindings/regulator/regulator.txt.
+
+Optional properties:
+
+  - reset-gpios : gpio used to reset the amplifier
+
+  - interrupt-parent : Specifies the phandle of the interrupt controller to
+    which the IRQs from CS35L33 are delivered to.
+ -  interrupts : IRQ line info CS35L33.
+    (See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+    for further information relating to interrupt properties)
+
+  - cirrus,boost-ctl : Booster voltage use to supply the amp. If the value is
+    0, then VBST = VP. If greater than 0, the boost voltage will be 3300mV with
+    a value of 1 and will increase at a step size of 100mV until a maximum of
+    8000mV.
+
+  - cirrus,ramp-rate : On power up, it affects the time from when the power
+    up sequence begins to the time the audio reaches a full-scale output.
+    On power down, it affects the time from when the power-down sequence
+    begins to when the amplifier disables the PWM outputs. If this property
+    is not set then soft ramping will be disabled and ramp time would be
+    20ms. If this property is set to 0,1,2,3 then ramp times would be 40ms,
+    60ms,100ms,175ms respectively for 48KHz sample rate.
+
+  - cirrus,boost-ipk : The maximum current allowed for the boost converter.
+    The range starts at 1850000uA and goes to a maximum of 3600000uA
+    with a step size of 15625uA. The default is 2500000uA.
+
+  - cirrus,imon-adc-scale : Configures the scaling of data bits from the IMON
+    ADC data word. This property can be set as a value of 0 for bits 15 down
+    to 0, 6 for 21 down to 6, 7, for 22 down to 7, 8 for 23 down to 8.
+
+
+Optional H/G Algorithm sub-node:
+
+The cs35l33 node can have a single "cirrus,hg-algo" sub-node that will enable
+the internal H/G Algorithm.
+
+  - cirrus,hg-algo : Sub-node for internal Class H/G algorithm that
+    controls the amplifier supplies.
+
+Optional properties for the "cirrus,hg-algo" sub-node:
+
+  - cirrus,mem-depth : Memory depth for the Class H/G algorithm measured in
+    LRCLK cycles. If this property is set to 0, 1, 2, or 3 then the memory
+    depths will be 1, 4, 8, 16 LRCLK cycles.  The default is 16 LRCLK cycles.
+
+    cirrus,release-rate : The number of consecutive LRCLK periods before
+    allowing release condition tracking updates. The number of LRCLK periods
+    start at 3 to a maximum of 255.
+
+  - cirrus,ldo-thld : Configures the signal threshold at which the PWM output
+    stage enters LDO operation. Starts as a default value of 50mV for a value
+    of 1 and increases with a step size of 50mV to a maximum of 750mV (value of
+    0xF).
+
+  - cirrus,ldo-path-disable : This is a boolean property. If present, the H/G
+    algorithm uses the max detection path.  If not present, the LDO
+    detection path is used.
+
+  - cirrus,ldo-entry-delay : The LDO entry delay in milliseconds before the H/G
+    algorithm switches to the LDO voltage.  This property can be set to values
+    from 0 to 7 for delays of 5ms, 10ms, 50ms, 100ms, 200ms, 500ms, 1000ms.
+    The default is 100ms.
+
+  - cirrus,vp-hg-auto : This is a boolean property.  When set, class H/G VPhg
+    automatic updating is enabled.
+
+  - cirrus,vp-hg :  Class H/G algorithm VPhg.  Controls the H/G algorithm's
+    reference to the VP voltage for when to start generating a boosted VBST.
+    The reference voltage starts at 3000mV with a value of 0x3 and is increased
+    by 100mV per step to a maximum of 5500mV.
+
+  - cirrus,vp-hg-rate : The rate (number of LRCLK periods) at which the VPhg is
+    allowed to increase to a higher voltage when using VPhg automatic
+    tracking. This property can be set to values from 0 to 3 with rates of 128
+    periods, 2048 periods, 32768 periods, and 524288 periods.
+    The default is 32768 periods.
+
+  - cirrus,vp-hg-va : VA calculation reference for automatic VPhg tracking
+    using VPMON. This property can be set to values from 0 to 6 starting at
+    1800mV with a step size of 50mV up to a maximum value of 1750mV.
+    Default is 1800mV.
+
+Example:
+
+cs35l33: cs35l33@40 {
+	compatible = "cirrus,cs35l33";
+	reg = <0x40>;
+
+	VA-supply = <&ldo5_reg>;
+	VP-supply = <&ldo5_reg>;
+
+	interrupt-parent = <&gpio8>;
+	interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+
+	reset-gpios = <&cs47l91 34 0>;
+
+	cirrus,ramp-rate = <0x0>;
+	cirrus,boost-ctl = <0x30>;  /* VBST = 8000mV */
+	cirrus,boost-ipk = <0xE0>; /* 3600mA */
+	cirrus,imon-adc-scale = <0> /* Bits 15 down to 0 */
+
+	cirrus,hg-algo {
+		cirrus,mem-depth = <0x3>;
+		cirrus,release-rate = <0x3>;
+		cirrus,ldo-thld = <0x1>;
+		cirrus,ldo-path-disable = <0x0>;
+		cirrus,ldo-entry-delay=<0x4>;
+		cirrus,vp-hg-auto;
+		cirrus,vp-hg=<0xF>;
+		cirrus,vp-hg-rate=<0x2>;
+		cirrus,vp-hg-va=<0x0>;
+	};
+};