On Wed, Sep 27, 2023 at 03:00:59PM -0500, Samuel Holland wrote: > On 2023-09-27 11:42 AM, Jisheng Zhang wrote: > > T-HEAD TH1520 platform's USB has a wrapper module around > > the DesignWare USB3 DRD controller. Add binding information doc for > > it. > > > > Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx> > > --- > > .../bindings/usb/thead,th1520-usb.yaml | 73 +++++++++++++++++++ > > 1 file changed, 73 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/usb/thead,th1520-usb.yaml > > > > diff --git a/Documentation/devicetree/bindings/usb/thead,th1520-usb.yaml b/Documentation/devicetree/bindings/usb/thead,th1520-usb.yaml > > new file mode 100644 > > index 000000000000..afb618eb5013 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/usb/thead,th1520-usb.yaml > > @@ -0,0 +1,73 @@ > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > > +%YAML 1.2 > > +--- > > +$id: http://devicetree.org/schemas/usb/thead,th1520-usb.yaml# > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > + > > +title: T-HEAD TH1520 DWC3 USB Controller Glue > > + > > +maintainers: > > + - Jisheng Zhang <jszhang@xxxxxxxxxx> > > + > > +properties: > > + compatible: > > + const: thead,th1520-usb > > + > > + reg: > > + maxItems: 1 > > + > > + clocks: > > + maxItems: 4 > > + > > + clock-names: > > + items: > > + - const: ref > > + - const: bus_early > > + - const: phy > > + - const: suspend > > Except for "phy", these clocks are already documented in snps,dwc3.yaml. Are > they necessary for the glue/PHY, or do they belong only in the controller node? Hi Samuel, Enabling ref, bus_early clks are necessary for the glue layer, because we program the glue registers before calling of_platform_populate() > They are not used by the driver in patch 2. Also, the PHY clock probably belongs > with the PHY node. Except enabling the phy clk, we don't need to touch the phy, so I'm not sure how to handle this if we have a dedicated phy driver thus a phy node. or use the usb-nop-xceiv? Thanks > > > + > > + ranges: true > > + > > + '#address-cells': > > + enum: [ 1, 2 ] > > + > > + '#size-cells': > > + enum: [ 1, 2 ] > > + > > +# Required child node: > > + > > +patternProperties: > > + "^usb@[0-9a-f]+$": > > + $ref: snps,dwc3.yaml# > > + > > +required: > > + - compatible > > + - reg > > + - clocks > > + - clock-names > > + - ranges > > + > > +additionalProperties: false > > The driver in patch 2 uses the thead,misc-sysreg and vbus-supply properties, > neither of which is documented here. Also, depending on the other bindings, the > VBUS supply should be referenced from the USB PHY or connector node, not here. > > Regards, > Samuel > > > +examples: > > + - | > > + > > + usb { > > + compatible = "thead,th1520-usb"; > > + reg = <0xec03f000 0x1000>; > > + clocks = <&clk 1>, > > + <&clk 2>, > > + <&clk 3>, > > + <&clk 4>; > > + clock-names = "ref", "bus_early", "phy", "suspend"; > > + ranges; > > + #address-cells = <1>; > > + #size-cells = <1>; > > + > > + usb@e7040000 { > > + compatible = "snps,dwc3"; > > + reg = <0xe7040000 0x10000>; > > + interrupts = <68>; > > + dr_mode = "host"; > > + }; > > + }; >
