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94 lines
3.0 KiB
Plaintext
94 lines
3.0 KiB
Plaintext
Cirrus Logic Lochnagar Audio Development Board
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Lochnagar is an evaluation and development board for Cirrus Logic
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Smart CODEC and Amp devices. It allows the connection of most Cirrus
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Logic devices on mini-cards, as well as allowing connection of
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various application processor systems to provide a full evaluation
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platform. Audio system topology, clocking and power can all be
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controlled through the Lochnagar, allowing the device under test
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to be used in a variety of possible use cases.
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This binding document describes the binding for the clock portion of
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the driver.
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Also see these documents for generic binding information:
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[1] Clock : ../clock/clock-bindings.txt
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And these for relevant defines:
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[2] include/dt-bindings/clock/lochnagar.h
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This binding must be part of the Lochnagar MFD binding:
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[3] ../mfd/cirrus,lochnagar.txt
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Required properties:
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- compatible : One of the following strings:
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"cirrus,lochnagar1-clk"
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"cirrus,lochnagar2-clk"
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- #clock-cells : Must be 1. The first cell indicates the clock
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number, see [2] for available clocks and [1].
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Optional properties:
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- clocks : Must contain an entry for each clock in clock-names.
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- clock-names : May contain entries for each of the following
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clocks:
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- ln-cdc-clkout : Output clock from CODEC card.
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- ln-dsp-clkout : Output clock from DSP card.
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- ln-gf-mclk1,ln-gf-mclk2,ln-gf-mclk3,ln-gf-mclk4 : Optional
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input audio clocks from host system.
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- ln-psia1-mclk, ln-psia2-mclk : Optional input audio clocks from
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external connector.
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- ln-spdif-clkout : Optional input audio clock from SPDIF.
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- ln-adat-mclk : Optional input audio clock from ADAT.
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- ln-pmic-32k : On board fixed clock.
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- ln-clk-12m : On board fixed clock.
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- ln-clk-11m : On board fixed clock.
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- ln-clk-24m : On board fixed clock.
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- ln-clk-22m : On board fixed clock.
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- ln-clk-8m : On board fixed clock.
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- ln-usb-clk-24m : On board fixed clock.
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- ln-usb-clk-12m : On board fixed clock.
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- assigned-clocks : A list of Lochnagar clocks to be reparented, see
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[2] for available clocks.
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- assigned-clock-parents : Parents to be assigned to the clocks
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listed in "assigned-clocks".
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Optional nodes:
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- fixed-clock nodes may be registered for the following on board clocks:
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- ln-pmic-32k : 32768 Hz
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- ln-clk-12m : 12288000 Hz
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- ln-clk-11m : 11298600 Hz
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- ln-clk-24m : 24576000 Hz
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- ln-clk-22m : 22579200 Hz
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- ln-clk-8m : 8192000 Hz
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- ln-usb-clk-24m : 24576000 Hz
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- ln-usb-clk-12m : 12288000 Hz
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Example:
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lochnagar {
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lochnagar-clk {
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compatible = "cirrus,lochnagar2-clk";
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#clock-cells = <1>;
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clocks = <&clk-audio>, <&clk_pmic>;
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clock-names = "ln-gf-mclk2", "ln-pmic-32k";
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assigned-clocks = <&lochnagar-clk LOCHNAGAR_CDC_MCLK1>,
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<&lochnagar-clk LOCHNAGAR_CDC_MCLK2>;
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assigned-clock-parents = <&clk-audio>,
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<&clk-pmic>;
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};
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clk-pmic: clk-pmic {
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compatible = "fixed-clock";
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clock-cells = <0>;
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clock-frequency = <32768>;
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};
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};
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