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Documentation: cs40l2x: Add f0/ReDC device tree entries

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Added device tree binding documentation for default, minimum and
maximum f0 and ReDC device tree entries.

Change-Id: I7f3d7170e51e81bf4900c4065500a78fbae55878
Signed-off-by: Jeff LaBundy <jeff.labundy@cirrus.com>
Signed-off-by: Ravi Vembu <raviv@motorola.com>
This commit is contained in:
Jeff LaBundy 2018-05-07 11:55:44 -05:00 • committed by a7301c
commit ecbe7bb187
1 changed files with 41 additions and 0 deletions
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41
Documentation/devicetree/bindings/cs40l2x.txt
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@ -31,6 +31,47 @@ Optional properties:
ASP_BCLK/REFCLK pin. This property is ignored for CS40L25A and CS40L25B
devices as reference clock selection is configured automatically.
- cirrus,f0-default : Default LRA resonant frequency (f0), expressed as
follows: cirrus,f0-default = f0 (Hz) * 2^14. This value represents the
frequency used during playback of PWLE segments specified with frequency
equal to f0; it also serves as the unit-specific f0 input to the click
compensation algorithm. It can be overwritten at a later time by writing
to the f0_stored sysfs control.
If this value is omitted or specified as zero, the measurement recorded in
the f0_measured sysfs control is used. If LRA diagnostics has not been
administered and f0_measured is uninitialized, 2621440 (160 Hz) is used.
- cirrus,f0-min : Minimum LRA resonant frequency (f0) that may be written to
the f0_stored sysfs control, expressed using the same numerical format as
cirrus,f0-default. If this value is omitted or specified as zero, no lower-
bound validation is performed.
- cirrus,f0-max : Maximum LRA resonant frequency (f0) that may be written to
the f0_stored sysfs control, expressed using the same numerical format as
cirrus,f0-default. If this value is omitted or specified as zero, no upper-
bound validation is performed.
- cirrus,redc-default : Default LRA series resistance (ReDC), expressed as
follows: cirrus,redc-default = ReDC (ohms) / 5.857 * 2^17. This value
represents the unit-specific ReDC input to the click compensation algorithm.
It can be overwritten at a later time by writing to the redc_stored sysfs
control.
If this value is omitted or specified as zero, the measurement recorded in
the redc_measured sysfs control is used. If LRA diagnostics has not been
administered and redc_measured is uninitialized, 340787 (15.2 ohms) is used.
- cirrus,redc-min : Minimum LRA series resistance (ReDC) that may be written
to the redc_stored sysfs control, expressed using the same numerical format
as cirrus,redc-default. If this value is omitted or specified as zero, no
lower-bound validation is performed.
- cirrus,redc-max : Maximum LRA series resistance (ReDC) that may be written
to the redc_stored sysfs control, expressed using the same numerical format
as cirrus,redc-default. If this value is omitted or specified as zero, no
upper-bound validation is performed.
Example:
cs40l20: cs40l20@43 {