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dt-bindings: usb: ci-hdrc-usb2: add fsl,picophy-rise-fall-time-adjust property

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The fsl,picophy-rise-fall-time-adjust property can help to adjust the
rise/fall times of the high-speed transmitter waveform. The value can be
0~3. It has no unit. According to the description of USBNC_n_PHY_CFG1
register, the rise/fall time will be increased or decreased by a certain
percentage relative to design default time if a value is given to this
property.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20230627112126.1882666-2-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2023-06-27 19:21:25 +08:00 committed by Greg Kroah-Hartman
parent 36668515d5
commit 8d2c452c9e
1 changed files with 12 additions and 0 deletions
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12
Documentation/devicetree/bindings/usb/ci-hdrc-usb2.yaml
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@ -292,6 +292,18 @@ properties:
minimum: 0x0
maximum: 0xf
fsl,picophy-rise-fall-time-adjust:
description:
HS Transmitter Rise/Fall Time Adjustment. Adjust the rise/fall times
of the high-speed transmitter waveform. It has no unit. The rise/fall
time will be increased or decreased by a certain percentage relative
to design default time. (0:-10%; 1:design default; 2:+15%; 3:+20%)
Details can refer to TXRISETUNE0 bit of USBNC_n_PHY_CFG1.
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 0
maximum: 3
default: 1
usb-phy:
description: phandle for the PHY device. Use "phys" instead.
$ref: /schemas/types.yaml#/definitions/phandle