[PATCH v4 10/18] dt-bindings: usb: Convert DWC USB3 bindings to DT schema

Serge Semin
2020-11-11T09:11:36Z

DWC USB3 DT node is supposed to be compliant with the Generic xHCI
Controller schema, but with additional vendor-specific properties, the
controller-specific reference clocks and PHYs. So let's convert the
currently available legacy text-based DWC USB3 bindings to the DT schema
and make sure the DWC USB3 nodes are also validated against the
usb-xhci.yaml schema.

Note we have to discard the nodename restriction of being prefixed with
"dwc3@" string, since in accordance with the usb-hcd.yaml schema USB nodes
are supposed to be named as "^usb(@.*)".

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v2:
- Discard '|' from the descriptions, since we don't need to preserve
the text formatting in any of them.
- Drop quotes from around the string constants.
- Fix the "clock-names" prop description to be referring the enumerated
clock-names instead of the ones from the Databook.

Changelog v3:
- Apply usb-xhci.yaml# schema only if the controller is supposed to work
as either host or otg.

Changelog v4:
- Apply usb-drd.yaml schema first. If the controller is configured
to work in a gadget mode only, then apply the usb.yaml schema too,
otherwise apply the usb-xhci.yaml schema.
- Discard the Rob'es Reviewed-by tag. Please review the patch one more
time.
---
.../devicetree/bindings/usb/dwc3.txt | 125 --------
.../devicetree/bindings/usb/snps,dwc3.yaml | 303 ++++++++++++++++++
2 files changed, 303 insertions(+), 125 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/usb/dwc3.txt
create mode 100644 Documentation/devicetree/bindings/usb/snps,dwc3.yaml

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
deleted file mode 100644
index d03edf9d3935..000000000000
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ /dev/null
@@ -1,125 +0,0 @@
-synopsys DWC3 CORE
-
-DWC3- USB3 CONTROLLER. Complies to the generic USB binding properties
- as described in 'usb/generic.txt'
-
-Required properties:
- - compatible: must be "snps,dwc3"
- - reg : Address and length of the register set for the device
- - interrupts: Interrupts used by the dwc3 controller.
- - clock-names: list of clock names. Ideally should be "ref",
- "bus_early", "suspend" but may be less or more.
- - clocks: list of phandle and clock specifier pairs corresponding to
- entries in the clock-names property.
-
-Exception for clocks:
- clocks are optional if the parent node (i.e. glue-layer) is compatible to
- one of the following:
- "cavium,octeon-7130-usb-uctl"
- "qcom,dwc3"
- "samsung,exynos5250-dwusb3"
- "samsung,exynos5433-dwusb3"
- "samsung,exynos7-dwusb3"
- "sprd,sc9860-dwc3"
- "st,stih407-dwc3"
- "ti,am437x-dwc3"
- "ti,dwc3"
- "ti,keystone-dwc3"
- "rockchip,rk3399-dwc3"
- "xlnx,zynqmp-dwc3"
-
-Optional properties:
- - usb-phy : array of phandle for the PHY device. The first element
- in the array is expected to be a handle to the USB2/HS PHY and
- the second element is expected to be a handle to the USB3/SS PHY
- - phys: from the *Generic PHY* bindings
- - phy-names: from the *Generic PHY* bindings; supported names are "usb2-phy"
- or "usb3-phy".
- - resets: set of phandle and reset specifier pairs
- - snps,usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
- - snps,usb3_lpm_capable: determines if platform is USB3 LPM capable
- - snps,dis-start-transfer-quirk: when set, disable isoc START TRANSFER command
- failure SW work-around for DWC_usb31 version 1.70a-ea06
- and prior.
- - snps,disable_scramble_quirk: true when SW should disable data scrambling.
- Only really useful for FPGA builds.
- - snps,has-lpm-erratum: true when DWC3 was configured with LPM Erratum enabled
- - snps,lpm-nyet-threshold: LPM NYET threshold
- - snps,u2exit_lfps_quirk: set if we want to enable u2exit lfps quirk
- - snps,u2ss_inp3_quirk: set if we enable P3 OK for U2/SS Inactive quirk
- - snps,req_p1p2p3_quirk: when set, the core will always request for
- P1/P2/P3 transition sequence.
- - snps,del_p1p2p3_quirk: when set core will delay P1/P2/P3 until a certain
- amount of 8B10B errors occur.
- - snps,del_phy_power_chg_quirk: when set core will delay PHY power change
- from P0 to P1/P2/P3.
- - snps,lfps_filter_quirk: when set core will filter LFPS reception.
- - snps,rx_detect_poll_quirk: when set core will disable a 400us delay to start
- Polling LFPS after RX.Detect.
- - snps,tx_de_emphasis_quirk: when set core will set Tx de-emphasis value.
- - snps,tx_de_emphasis: the value driven to the PHY is controlled by the
- LTSSM during USB3 Compliance mode.
- - snps,dis_u3_susphy_quirk: when set core will disable USB3 suspend phy.
- - snps,dis_u2_susphy_quirk: when set core will disable USB2 suspend phy.
- - snps,dis_enblslpm_quirk: when set clears the enblslpm in GUSB2PHYCFG,
- disabling the suspend signal to the PHY.
- - snps,dis-u1-entry-quirk: set if link entering into U1 needs to be disabled.
- - snps,dis-u2-entry-quirk: set if link entering into U2 needs to be disabled.
- - snps,dis_rxdet_inp3_quirk: when set core will disable receiver detection
- in PHY P3 power state.
- - snps,dis-u2-freeclk-exists-quirk: when set, clear the u2_freeclk_exists
- in GUSB2PHYCFG, specify that USB2 PHY doesn't provide
- a free-running PHY clock.
- - snps,dis-del-phy-power-chg-quirk: when set core will change PHY power
- from P0 to P1/P2/P3 without delay.
- - snps,dis-tx-ipgap-linecheck-quirk: when set, disable u2mac linestate check
- during HS transmit.
- - snps,parkmode-disable-ss-quirk: when set, all SuperSpeed bus instances in
- park mode are disabled.
- - snps,dis_metastability_quirk: when set, disable metastability workaround.
- CAUTION: use only if you are absolutely sure of it.
- - snps,is-utmi-l1-suspend: true when DWC3 asserts output signal
- utmi_l1_suspend_n, false when asserts utmi_sleep_n
- - snps,hird-threshold: HIRD threshold
- - snps,hsphy_interface: High-Speed PHY interface selection between "utmi" for
- UTMI+ and "ulpi" for ULPI when the DWC_USB3_HSPHY_INTERFACE has value 3.
- - snps,quirk-frame-length-adjustment: Value for GFLADJ_30MHZ field of GFLADJ
- register for post-silicon frame length adjustment when the
- fladj_30mhz_sdbnd signal is invalid or incorrect.
- - snps,rx-thr-num-pkt-prd: periodic ESS RX packet threshold count - host mode
- only. Set this and rx-max-burst-prd to a valid,
- non-zero value 1-16 (DWC_usb31 programming guide
- section 1.2.4) to enable periodic ESS RX threshold.
- - snps,rx-max-burst-prd: max periodic ESS RX burst size - host mode only. Set
- this and rx-thr-num-pkt-prd to a valid, non-zero value
- 1-16 (DWC_usb31 programming guide section 1.2.4) to
- enable periodic ESS RX threshold.
- - snps,tx-thr-num-pkt-prd: periodic ESS TX packet threshold count - host mode
- only. Set this and tx-max-burst-prd to a valid,
- non-zero value 1-16 (DWC_usb31 programming guide
- section 1.2.3) to enable periodic ESS TX threshold.
- - snps,tx-max-burst-prd: max periodic ESS TX burst size - host mode only. Set
- this and tx-thr-num-pkt-prd to a valid, non-zero value
- 1-16 (DWC_usb31 programming guide section 1.2.3) to
- enable periodic ESS TX threshold.
-
- - <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.
- - snps,incr-burst-type-adjustment: Value for INCR burst type of GSBUSCFG0
- register, undefined length INCR burst type enable and INCRx type.
- When just one value, which means INCRX burst mode enabled. When
- more than one value, which means undefined length INCR burst type
- enabled. The values can be 1, 4, 8, 16, 32, 64, 128 and 256.
-
- - in addition all properties from usb-xhci.txt from the current directory are
- supported as well
-
-
-This is usually a subnode to DWC3 glue to which it is connected.
-
-dwc3@4a030000 {
- compatible = "snps,dwc3";
- reg = <0x4a030000 0xcfff>;
- interrupts = <0 92 4>
- usb-phy = <&usb2_phy>, <&usb3,phy>;
- snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
-};
diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
new file mode 100644
index 000000000000..079617891da6
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -0,0 +1,303 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/snps,dwc3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare USB3 Controller
+
+maintainers:
+ - Felipe Balbi <balbi@kernel.org>
+
+description:
+ This is usually a subnode to DWC3 glue to which it is connected, but can also
+ be presented as a standalone DT node with an optional vendor-specific
+ compatible string.
+
+allOf:
+ - $ref: usb-drd.yaml#
+ - if:
+ properties:
+ dr_mode:
+ const: peripheral
+ then:
+ $ref: usb.yaml#
+ else:
+ $ref: usb-xhci.yaml#
+
+properties:
+ compatible:
+ contains:
+ const: snps,dwc3
+
+ interrupts:
+ minItems: 1
+ maxItems: 3
+
+ clocks:
+ description:
+ In general the core supports three types of clocks. bus_early is a
+ SoC Bus Clock (AHB/AXI/Native). ref generates ITP when the UTMI/ULPI
+ PHY is suspended. suspend clocks a small part of the USB3 core when
+ SS PHY in P3. But particular cases may differ from that having less
+ or more clock sources with another names.
+
+ clock-names:
+ contains:
+ anyOf:
+ - enum: [bus_early, ref, suspend]
+ - true
+
+ usb-phy:
+ minItems: 1
+ items:
+ - description: USB2/HS PHY
+ - description: USB3/SS PHY
+
+ phys:
+ minItems: 1
+ items:
+ - description: USB2/HS PHY
+ - description: USB3/SS PHY
+
+ phy-names:
+ minItems: 1
+ items:
+ - const: usb2-phy
+ - const: usb3-phy
+
+ resets:
+ minItems: 1
+
+ snps,usb2-lpm-disable:
+ description: Indicate if we don't want to enable USB2 HW LPM
+ type: boolean
+
+ snps,usb3_lpm_capable:
+ description: Determines if platform is USB3 LPM capable
+ type: boolean
+
+ snps,dis-start-transfer-quirk:
+ description:
+ When set, disable isoc START TRANSFER command failure SW work-around
+ for DWC_usb31 version 1.70a-ea06 and prior.
+ type: boolean
+
+ snps,disable_scramble_quirk:
+ description:
+ True when SW should disable data scrambling. Only really useful for FPGA
+ builds.
+ type: boolean
+
+ snps,has-lpm-erratum:
+ description: True when DWC3 was configured with LPM Erratum enabled
+ type: boolean
+
+ snps,lpm-nyet-threshold:
+ description: LPM NYET threshold
+ $ref: /schemas/types.yaml#/definitions/uint8
+
+ snps,u2exit_lfps_quirk:
+ description: Set if we want to enable u2exit lfps quirk
+ type: boolean
+
+ snps,u2ss_inp3_quirk:
+ description: Set if we enable P3 OK for U2/SS Inactive quirk
+ type: boolean
+
+ snps,req_p1p2p3_quirk:
+ description:
+ When set, the core will always request for P1/P2/P3 transition sequence.
+ type: boolean
+
+ snps,del_p1p2p3_quirk:
+ description:
+ When set core will delay P1/P2/P3 until a certain amount of 8B10B errors
+ occur.
+ type: boolean
+
+ snps,del_phy_power_chg_quirk:
+ description: When set core will delay PHY power change from P0 to P1/P2/P3.
+ type: boolean
+
+ snps,lfps_filter_quirk:
+ description: When set core will filter LFPS reception.
+ type: boolean
+
+ snps,rx_detect_poll_quirk:
+ description:
+ when set core will disable a 400us delay to start Polling LFPS after
+ RX.Detect.
+ type: boolean
+
+ snps,tx_de_emphasis_quirk:
+ description: When set core will set Tx de-emphasis value
+ type: boolean
+
+ snps,tx_de_emphasis:
+ description:
+ The value driven to the PHY is controlled by the LTSSM during USB3
+ Compliance mode.
+ $ref: /schemas/types.yaml#/definitions/uint8
+
+ snps,dis_u3_susphy_quirk:
+ description: When set core will disable USB3 suspend phy
+ type: boolean
+
+ snps,dis_u2_susphy_quirk:
+ description: When set core will disable USB2 suspend phy
+ type: boolean
+
+ snps,dis_enblslpm_quirk:
+ description:
+ When set clears the enblslpm in GUSB2PHYCFG, disabling the suspend signal
+ to the PHY.
+ type: boolean
+
+ snps,dis-u1-entry-quirk:
+ description: Set if link entering into U1 needs to be disabled
+ type: boolean
+
+ snps,dis-u2-entry-quirk:
+ description: Set if link entering into U2 needs to be disabled
+ type: boolean
+
+ snps,dis_rxdet_inp3_quirk:
+ description:
+ When set core will disable receiver detection in PHY P3 power state.
+ type: boolean
+
+ snps,dis-u2-freeclk-exists-quirk:
+ description:
+ When set, clear the u2_freeclk_exists in GUSB2PHYCFG, specify that USB2
+ PHY doesn't provide a free-running PHY clock.
+ type: boolean
+
+ snps,dis-del-phy-power-chg-quirk:
+ description:
+ When set core will change PHY power from P0 to P1/P2/P3 without delay.
+ type: boolean
+
+ snps,dis-tx-ipgap-linecheck-quirk:
+ description: When set, disable u2mac linestate check during HS transmit
+ type: boolean
+
+ snps,parkmode-disable-ss-quirk:
+ description:
+ When set, all SuperSpeed bus instances in park mode are disabled.
+ type: boolean
+
+ snps,dis_metastability_quirk:
+ description:
+ When set, disable metastability workaround. CAUTION! Use only if you are
+ absolutely sure of it.
+ type: boolean
+
+ snps,is-utmi-l1-suspend:
+ description:
+ True when DWC3 asserts output signal utmi_l1_suspend_n, false when
+ asserts utmi_sleep_n.
+ type: boolean
+
+ snps,hird-threshold:
+ description: HIRD threshold
+ $ref: /schemas/types.yaml#/definitions/uint8
+
+ snps,hsphy_interface:
+ description:
+ High-Speed PHY interface selection between UTMI+ and ULPI when the
+ DWC_USB3_HSPHY_INTERFACE has value 3.
+ $ref: /schemas/types.yaml#/definitions/uint8
+ enum: [utmi, ulpi]
+
+ snps,quirk-frame-length-adjustment:
+ description:
+ Value for GFLADJ_30MHZ field of GFLADJ register for post-silicon frame
+ length adjustment when the fladj_30mhz_sdbnd signal is invalid or
+ incorrect.
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ snps,rx-thr-num-pkt-prd:
+ description:
+ Periodic ESS RX packet threshold count (host mode only). Set this and
+ snps,rx-max-burst-prd to a valid, non-zero value 1-16 (DWC_usb31
+ programming guide section 1.2.4) to enable periodic ESS RX threshold.
+ $ref: /schemas/types.yaml#/definitions/uint8
+ minimum: 1
+ maximum: 16
+
+ snps,rx-max-burst-prd:
+ description:
+ Max periodic ESS RX burst size (host mode only). Set this and
+ snps,rx-thr-num-pkt-prd to a valid, non-zero value 1-16 (DWC_usb31
+ programming guide section 1.2.4) to enable periodic ESS RX threshold.
+ $ref: /schemas/types.yaml#/definitions/uint8
+ minimum: 1
+ maximum: 16
+
+ snps,tx-thr-num-pkt-prd:
+ description:
+ Periodic ESS TX packet threshold count (host mode only). Set this and
+ snps,tx-max-burst-prd to a valid, non-zero value 1-16 (DWC_usb31
+ programming guide section 1.2.3) to enable periodic ESS TX threshold.
+ $ref: /schemas/types.yaml#/definitions/uint8
+ minimum: 1
+ maximum: 16
+
+ snps,tx-max-burst-prd:
+ description:
+ Max periodic ESS TX burst size (host mode only). Set this and
+ snps,tx-thr-num-pkt-prd to a valid, non-zero value 1-16 (DWC_usb31
+ programming guide section 1.2.3) to enable periodic ESS TX threshold.
+ $ref: /schemas/types.yaml#/definitions/uint8
+ minimum: 1
+ maximum: 16
+
+ tx-fifo-resize:
+ description: Determines if the FIFO *has* to be reallocated
+ deprecated: true
+ type: boolean
+
+ snps,incr-burst-type-adjustment:
+ description:
+ Value for INCR burst type of GSBUSCFG0 register, undefined length INCR
+ burst type enable and INCRx type. A single value means INCRX burst mode
+ enabled. If more than one value specified, undefined length INCR burst
+ type will be enabled with burst lengths utilized up to the maximum
+ of the values passed in this property.
+ $ref: /schemas/types.yaml#/definitions/uint32-array
+ minItems: 1
+ maxItems: 8
+ uniqueItems: true
+ items:
+ enum: [1, 4, 8, 16, 32, 64, 128, 256]
+
+unevaluatedProperties: false
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+examples:
+ - |
+ usb@4a030000 {
+ compatible = "snps,dwc3";
+ reg = <0x4a030000 0xcfff>;
+ interrupts = <0 92 4>;
+ usb-phy = <&usb2_phy>, <&usb3_phy>;
+ snps,incr-burst-type-adjustment = <1>, <4>, <8>, <16>;
+ };
+ - |
+ usb@4a000000 {
+ compatible = "snps,dwc3";
+ reg = <0x4a000000 0xcfff>;
+ interrupts = <0 92 4>;
+ clocks = <&clk 1>, <&clk 2>, <&clk 3>;
+ clock-names = "bus_early", "ref", "suspend";
+ phys = <&usb2_phy>, <&usb3_phy>;
+ phy-names = "usb2-phy", "usb3-phy";
+ snps,dis_u2_susphy_quirk;
+ snps,dis_enblslpm_quirk;
+ };
+...
--
2.28.0