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Message-ID: <YWhoVd/XR2SdAbXV@robh.at.kernel.org>
Date: Thu, 14 Oct 2021 12:26:45 -0500
From: Rob Herring <robh@...nel.org>
To: Amelie Delaunay <amelie.delaunay@...s.st.com>
Cc: Kishon Vijay Abraham I <kishon@...com>,
Vinod Koul <vkoul@...nel.org>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH v2 2/3] dt-bindings: phy: phy-stm32-usbphyc: add optional
phy tuning properties
On Tue, Oct 05, 2021 at 05:24:52PM +0200, Amelie Delaunay wrote:
> This patch adds the description of new optional phy tuning properties
> for usbphyc phy sub nodes.
>
> Signed-off-by: Amelie Delaunay <amelie.delaunay@...s.st.com>
> ---
> Changes in v2:
> - st,phy-tuning property removed
> - tuning properties are now put directly in each child node
> - tuning properties are no more free form text and their name reworked
> ---
> .../bindings/phy/phy-stm32-usbphyc.yaml | 126 ++++++++++++++++++
> 1 file changed, 126 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
> index 3329f1d33a4f..c0f4dff2b8cb 100644
> --- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
> +++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
> @@ -81,6 +81,116 @@ patternProperties:
> properties:
> vbus-supply: true
>
> + # It can be necessary to adjust the PHY settings to compensate parasitics, which can be due
> + # to USB connector/receptacle, routing, ESD protection component,... Here is the list of
> + # all optional parameters to tune the interface of the PHY (HS for High-Speed, FS for Full-
> + # Speed, LS for Low-Speed)
> +
> + st,current-boost-milliamp:
Not a documented unit. Use '-microamp'.
> + description: Current boosting in mA
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 1
> + maximum: 2
> +
> + st,no-lsfs-fb-cap:
> + description: Disables the LS/FS feedback capacitor
> + type: boolean
> +
> + st,decrease-hs-slew-rate:
> + description: Decreases the HS driver slew rate by 10%
> + type: boolean
> +
> + st,tune-hs-dc-level:
> + description: Tunes the HS driver DC level
You need '|' after 'description:' to retain the formatting you have
here.
> + - <0> normal level
> + - <1> increases the level by 5 to 7 mV
> + - <2> increases the level by 10 to 14 mV
> + - <3> decreases the level by 5 to 7 mV
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 3
> + default: 0
> +
> + st,enable-fs-rftime-tuning:
> + description: Enables the FS rise/fall tuning option
> + type: boolean
> +
> + st,enable-hs-rftime-reduction:
> + description: Enables the HS rise/fall reduction feature
> + type: boolean
> +
> + st,trim-hs-current:
> + description: Controls HS driver current trimming for choke compensation
> + - <0> = 18.87 mA target current / nominal + 0%
> + - <1> = 19.165 mA target current / nominal + 1.56%
> + - <2> = 19.46 mA target current / nominal + 3.12%
> + - <3> = 19.755 mA target current / nominal + 4.68%
> + - <4> = 20.05 mA target current / nominal + 6.24%
> + - <5> = 20.345 mA target current / nominal + 7.8%
> + - <6> = 20.64 mA target current / nominal + 9.36%
> + - <7> = 20.935 mA target current / nominal + 10.92%
> + - <8> = 21.23 mA target current / nominal + 12.48%
> + - <9> = 21.525 mA target current / nominal + 14.04%
> + - <10> = 21.82 mA target current / nominal + 15.6%
> + - <11> = 22.115 mA target current / nominal + 17.16%
> + - <12> = 22.458 mA target current / nominal + 19.01%
> + - <13> = 22.755 mA target current / nominal + 20.58%
> + - <14> = 23.052 mA target current / nominal + 22.16%
> + - <15> = 23.348 mA target current / nominal + 23.73%
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 15
> + default: 0
> +
> + st,trim-hs-impedance:
> + description: Controls HS driver impedance tuning for choke compensation
> + - <0> = no impedance offset
> + - <1> = reduce the impedance by 2 ohms
> + - <2> = reduce the impedance by 4 ohms
> + - <3> = reduce the impedance by 6 ohms
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 3
> + default: 0
> +
> + st,tune-squelch-level:
> + description: Tunes the squelch DC threshold value
> + - <0> = no shift in threshold
> + - <1> = threshold shift by +7 mV
> + - <2> = threshold shift by -5 mV
> + - <3> = threshold shift by +14 mV
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 3
> + default: 0
> +
> + st,enable-hs-rx-gain-eq:
> + description: Enables the HS Rx gain equalizer
> + type: boolean
> +
> + st,tune-hs-rx-offset:
> + description: Adjusts the HS Rx offset
> + - <0> = no offset
> + - <1> = offset of +5 mV
> + - <2> = offset of +10 mV
> + - <3> = offset of -5 mV
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 3
> + default: 0
> +
> + st,no-hs-ftime-ctrl:
> + description: Disables the HS fall time control of single ended signals during pre-emphasis
> + type: boolean
> +
> + st,no-lsfs-sc:
> + description: Disables the short circuit protection in LS/FS driver
> + type: boolean
> +
> + st,enable-hs-tx-staggering:
> + description: Enables the basic staggering in HS Tx mode
> + type: boolean
> +
> allOf:
> - if:
> properties:
> @@ -137,6 +247,14 @@ examples:
> reg = <0>;
> phy-supply = <&vdd_usb>;
> #phy-cells = <0>;
> + st,tune-hs-dc-level = <2>;
> + st,enable-fs-rftime-tuning;
> + st,enable-hs-rftime-reduction;
> + st,trim-hs-current = <15>;
> + st,trim-hs-impedance = <1>;
> + st,tune-squelch-level = <3>;
> + st,tune-hs-rx-offset = <2>;
> + st,no-lsfs-sc;
> connector {
> compatible = "usb-a-connector";
> vbus-supply = <&vbus_sw>;
> @@ -147,6 +265,14 @@ examples:
> reg = <1>;
> phy-supply = <&vdd_usb>;
> #phy-cells = <1>;
> + st,tune-hs-dc-level = <2>;
> + st,enable-fs-rftime-tuning;
> + st,enable-hs-rftime-reduction;
> + st,trim-hs-current = <15>;
> + st,trim-hs-impedance = <1>;
> + st,tune-squelch-level = <3>;
> + st,tune-hs-rx-offset = <2>;
> + st,no-lsfs-sc;
> };
> };
> ...
> --
> 2.25.1
>
>
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