On Fri, May 13, 2016 at 04:02:53PM -0500, Paul.Handrigan@xxxxxxxxxx wrote:
> From: Paul Handrigan <Paul.Handrigan@xxxxxxxxxx>
>
> Add device tree bindings file for the cs35l33 8V boosted
> class D amplifier.
>
> Signed-off-by: Paul Handrigan <Paul.Handrigan@xxxxxxxxxx>
> ---
> .../devicetree/bindings/sound/cs35l33.txt | 73 ++++++++++++++++++++++
> 1 file changed, 73 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/sound/cs35l33.txt
>
> diff --git a/Documentation/devicetree/bindings/sound/cs35l33.txt b/Documentation/devicetree/bindings/sound/cs35l33.txt
> new file mode 100644
> index 0000000..273d73a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/cs35l33.txt
> @@ -0,0 +1,73 @@
> +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)
> +
> + - 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 3.3V with
> + a value of 1 and will increase at a step size of 0.1V until a maximum of
> + 8.0V.
Can you just specify this is microvolts? Looks like an easy conversion.
> +
> + - 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.
Either use time units or add vendor prefix.
> + - boost-ipk : The maximum current allowed for the boost converter.
> + The range starts at 1.85A (0xF0) and goes to a maximum of 3.60A (0xE0)
> + with a step size of 0.015625A. The default is 2.50A (0x90).
Can this be in microamps?
Are these standard/typical properties for Class D amps?
> +
> + - hg-algo : Parameters for internal Class H/G algorithm that
> + controls the amplifier supplies.
Each property in this node needs to be defined.
> +
> +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>;
> +
> + ramp-rate = <0x0>;
> + boost-ctl = <0x30>; /* VBST = 8.0V */
> + boost-ipk = <0xE0>; /* 3.60A */
> +
> + hg-algo {
> + mem-depth = <0x3>;
> + release-rate = <0x3>;
> + hd-rm = <0xA>;
> + ldo-thld = <0x1>;
> + ldo-path-disable = <0x0>;
> + ldo-entry-delay=<0x4>;
> + vp-hg-auto;
> + vp-hg=<0xF>;
> + vp-hg-rate=<0x2>;
> + vp-hg-va=<0x0>;
> + };
> +};
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