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The TAS5086 has two alternative modes to start its PWM channels, Mid-Z and Low-Z. Which one to use depends on how the PWM power stages are connected to the TAS5086. This patch adds 6 optional boolean properties to the DT bindings of the driver which allow the user to configure each individual channel to the Mid-Z scheme, and leaves all the others to the default (Low-Z). Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Mark Brown <broonie@linaro.org>
44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
Texas Instruments TAS5086 6-channel PWM Processor
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Required properties:
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- compatible: Should contain "ti,tas5086".
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- reg: The i2c address. Should contain <0x1b>.
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Optional properties:
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- reset-gpio: A GPIO spec to define which pin is connected to the
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chip's !RESET pin. If specified, the driver will
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assert a hardware reset at probe time.
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- ti,charge-period: This property should contain the time in microseconds
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that closely matches the external single-ended
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split-capacitor charge period. The hardware chip
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waits for this period of time before starting the
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PWM signals. This helps reduce pops and clicks.
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When not specified, the hardware default of 1300ms
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is retained.
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- ti,mid-z-channel-X: Boolean properties, X being a number from 1 to 6.
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If given, channel X will start with the Mid-Z start
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sequence, otherwise the default Low-Z scheme is used.
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The correct configuration depends on how the power
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stages connected to the PWM output pins work. Not all
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power stages are compatible to Mid-Z - please refer
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to the datasheets for more details.
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Most systems should not set any of these properties.
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Examples:
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i2c_bus {
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tas5086@1b {
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compatible = "ti,tas5086";
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reg = <0x1b>;
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reset-gpio = <&gpio 23 0>;
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ti,charge-period = <156000>;
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};
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};
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