100 lines
3.3 KiB
Plaintext
Executable file
100 lines
3.3 KiB
Plaintext
Executable file
Cirrus Logic Madera class audio codecs pinctrl driver
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The Cirrus Logic Madera codecs provide a number of GPIO functions for
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interfacing to external hardware and to provide logic outputs to other devices.
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Certain groups of GPIO pins also have an alternate function, normally as an
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audio interface.
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The set of available GPIOs, functions and alternate function groups differs
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between codecs so refer to the datasheet for the codec for further information
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on what is supported on that device.
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The properties for this driver exist within the parent MFD driver node.
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See also
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the core bindings for the parent MFD driver:
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Documentation/devicetree/bindings/mfd/madera.txt
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the generic pinmix bindings:
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Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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Required properties of parent mfd node:
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- pinctrl-names : must be "default"
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- pinctrl-0 : a phandle to the node containing the subnodes containing default
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configurations
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Required subnodes:
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One subnode is required to contain the default settings. It contains an
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arbitrary number of configuration subnodes, one for each group or pin
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configuration you want to apply as a default.
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Required properties of configuration subnodes:
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- groups : name of one pin group to configure. One of:
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aif1, aif2, aif3, aif4, mif1, mif2, mif3, pdmspk1, pdmspk2,
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dmic4, dmic5, dmic6,
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gpio1, gpio2, ..., gpio40
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The gpioN groups select the single pin of this name for configuration
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Optional properties of configuration subnodes:
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Any configuration option not explicitly listed in the dts will be left at
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chip default setting.
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- function : name of function to assign to this group. One of:
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aif1, aif2, aif3, aif4, mif1, mif2, mif3, pdmspk1, pdmspk2,
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dmic3, dmic4, dmic5, dmic6,
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io, dsp-gpio, irq1, irq2,
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fll1-clk, fll1-lock, fll2-clk, fll2-lock, fll3-clk, fll3-lock,
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fllao-clk, fllao-lock,
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opclk, opclk-async, pwm1, pwm2, spdif,
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asrc1-in1-lock, asrc1-in2-lock, asrc2-in1-lock, asrc2-in2-lock,
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spkl-short-circuit, spkr-short-circuit, spk-shutdown,
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spk-overheat-shutdown, spk-overheat-warn,
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timer1-sts, timer2-sts, timer3-sts, timer4-sts, timer5-sts, timer6-sts,
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timer7-sts, timer8-sts,
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log1-fifo-ne, log2-fifo-ne, log3-fifo-ne, log4-fifo-ne, log5-fifo-ne,
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log6-fifo-ne, log7-fifo-ne, log8-fifo-ne,
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- bias-disable : disable pull-up and pull-down
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- bias-bus-hold : enable buskeeper
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- bias-pull-up : output is pulled-up
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- bias-pull-down : output is pulled-down
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- drive-push-pull : CMOS output
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- drive-open-drain : open-drain output
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- drive-strength : drive strength in mA. Valid values are 4 or 8
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- input-schmitt-enable : enable schmitt-trigger mode
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- input-schmitt-disable : disable schmitt-trigger mode
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- input-debounce : A value of 0 disables debounce, a value !=0 enables
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debounce
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- output-low : set the pin to output mode with low level
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- output-high : set the pin to output mode with high level
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Example:
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cs47l85@0 {
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compatible = "cirrus,cs47l85";
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pinctrl-names = "default";
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pinctrl-0 = <&cs47l85_defaults>;
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cs47l85_defaults: cs47l85-gpio-defaults {
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aif1 {
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groups = "aif1";
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function = "aif1";
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bias-bus-hold;
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};
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aif2 {
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groups = "aif2";
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function = "aif2";
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bias-bus-hold;
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};
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opclk {
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groups = "gpio1";
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function = "opclk";
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bias-pull-up;
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drive-strength = <8>;
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};
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};
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};
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