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Date: Tue, 13 Oct 2020 17:29:11 +0300
From: Serge Semin <Sergey.Semin@...kalelectronics.ru>
To: Rob Herring <robh@...nel.org>
CC: Serge Semin <fancer.lancer@...il.com>,
Mathias Nyman <mathias.nyman@...el.com>,
Felipe Balbi <balbi@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Manu Gautam <mgautam@...eaurora.org>,
Roger Quadros <rogerq@...com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Neil Armstrong <narmstrong@...libre.com>,
Kevin Hilman <khilman@...libre.com>,
<linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 07/18] dt-bindings: usb: Convert xHCI bindings to DT
schema
On Tue, Oct 13, 2020 at 07:30:04AM -0500, Rob Herring wrote:
> On Sun, Oct 11, 2020 at 01:41:10AM +0300, Serge Semin wrote:
> > Currently the DT bindings of Generic xHCI Controllers are described by means
> > of the legacy text file. Since such format is deprecated in favor of the
> > DT schema, let's convert the Generic xHCI Controllers bindings file to the
> > corresponding yaml files. There will be two of them: a DT schema for the
> > xHCI controllers on a generic platform and a DT schema validating a generic
> > xHCI controllers properties. The later will be used to validate the xHCI
> > controllers, which aside from some vendor-specific features support the
> > basic xHCI functionality.
> >
> > An xHCI-compatible DT node shall support the standard USB HCD properties
> > and custom ones like: usb2-lpm-disable, usb3-lpm-capable,
> > quirk-broken-port-ped and imod-interval-ns. In addition if a generic xHCI
> > controller is being validated against the DT schema it is also supposed to
> > be equipped with mandatory compatible string, single registers range,
> > single interrupts source, and is supposed to optionally contain up to two
> > reference clocks for the controller core and CSRs.
> >
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > ---
> > .../devicetree/bindings/usb/generic-xhci.yaml | 63 +++++++++++++++++++
> > .../devicetree/bindings/usb/usb-xhci.txt | 41 ------------
> > .../devicetree/bindings/usb/usb-xhci.yaml | 40 ++++++++++++
> > 3 files changed, 103 insertions(+), 41 deletions(-)
> > create mode 100644 Documentation/devicetree/bindings/usb/generic-xhci.yaml
> > delete mode 100644 Documentation/devicetree/bindings/usb/usb-xhci.txt
> > create mode 100644 Documentation/devicetree/bindings/usb/usb-xhci.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/usb/generic-xhci.yaml b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
> > new file mode 100644
> > index 000000000000..1ea1d49a8175
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/generic-xhci.yaml
> > @@ -0,0 +1,63 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/usb/generic-xhci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: USB xHCI Controller Device Tree Bindings
> > +
> > +maintainers:
> > + - Mathias Nyman <mathias.nyman@...el.com>
> > +
> > +allOf:
> > + - $ref: "usb-xhci.yaml#"
> > +
> > +properties:
> > + compatible:
> > + oneOf:
> > + - description: Generic xHCI device
> > + const: generic-xhci
> > + - description: Armada 37xx/375/38x/8k SoCs
> > + items:
> > + - enum:
> > + - marvell,armada3700-xhci
> > + - marvell,armada-375-xhci
> > + - marvell,armada-380-xhci
> > + - marvell,armada-8k-xhci
> > + - const: generic-xhci
> > + - description: Broadcom STB SoCs with xHCI
> > + const: brcm,bcm7445-xhci
> > + - description: Generic xHCI device
> > + const: xhci-platform
> > + deprecated: true
> > +
> > + reg:
> > + maxItems: 1
> > +
> > + interrupts:
> > + maxItems: 1
> > +
> > + clocks:
> > + minItems: 1
> > + maxItems: 2
> > +
> > + clock-names:
> > + minItems: 1
> > + items:
> > + - const: core
> > + - const: reg
> > +
> > +unevaluatedProperties: false
> > +
> > +required:
> > + - compatible
> > + - reg
> > + - interrupts
> > +
> > +examples:
> > + - |
> > + usb@...31000 {
> > + compatible = "generic-xhci";
> > + reg = <0xf0931000 0x8c8>;
> > + interrupts = <0x0 0x4e 0x0>;
> > + };
> > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt
> > deleted file mode 100644
> > index 0c5cff84a969..000000000000
> > --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt
> > +++ /dev/null
> > @@ -1,41 +0,0 @@
> > -USB xHCI controllers
> > -
> > -Required properties:
> > - - compatible: should be one or more of
> > -
> > - - "generic-xhci" for generic XHCI device
> > - - "marvell,armada3700-xhci" for Armada 37xx SoCs
> > - - "marvell,armada-375-xhci" for Armada 375 SoCs
> > - - "marvell,armada-380-xhci" for Armada 38x SoCs
> > - - "brcm,bcm7445-xhci" for Broadcom STB SoCs with XHCI
> > - - "xhci-platform" (deprecated)
> > -
> > - When compatible with the generic version, nodes must list the
> > - SoC-specific version corresponding to the platform first
> > - followed by the generic version.
> > -
> > - - reg: should contain address and length of the standard XHCI
> > - register set for the device.
> > - - interrupts: one XHCI interrupt should be described here.
> > -
> > -Optional properties:
> > - - clocks: reference to the clocks
> > - - clock-names: mandatory if there is a second clock, in this case
> > - the name must be "core" for the first clock and "reg" for the
> > - second one
> > - - usb2-lpm-disable: indicate if we don't want to enable USB2 HW LPM
> > - - usb3-lpm-capable: determines if platform is USB3 LPM capable
> > - - quirk-broken-port-ped: set if the controller has broken port disable mechanism
> > - - imod-interval-ns: default interrupt moderation interval is 5000ns
> > - - phys : see usb-hcd.yaml in the current directory
> > -
> > -additionally the properties from usb-hcd.yaml (in the current directory) are
> > -supported.
> > -
> > -
> > -Example:
> > - usb@...31000 {
> > - compatible = "generic-xhci";
> > - reg = <0xf0931000 0x8c8>;
> > - interrupts = <0x0 0x4e 0x0>;
> > - };
> > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.yaml b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> > new file mode 100644
> > index 000000000000..c5c177f2e055
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/usb-xhci.yaml
> > @@ -0,0 +1,40 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/usb/usb-xhci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Generic USB xHCI Controller Device Tree Bindings
> > +
> > +maintainers:
> > + - Mathias Nyman <mathias.nyman@...el.com>
> > +
> > +allOf:
> > + - $ref: "usb-hcd.yaml#"
> > +
> > +properties:
> > + usb2-lpm-disable:
> > + description: Indicates if we don't want to enable USB2 HW LPM
> > + type: boolean
> > +
> > + usb3-lpm-capable:
> > + description: Determines if platform is USB3 LPM capable
> > + type: boolean
> > +
> > + quirk-broken-port-ped:
> > + description: Set if the controller has broken port disable mechanism
> > + type: boolean
> > +
> > + imod-interval-ns:
> > + description: Interrupt moderation interval
> > + default: 5000
>
> Having additionalProperties or unevaluatedProperties is going to be
> mandatory, so for this add:
>
> additionalProperties: true
Ok. I'll get to remember this.
-Sergey
>
> > +
> > +examples:
> > + - |
> > + usb@...30000 {
> > + compatible = "generic-xhci";
> > + reg = <0xf0930000 0x8c8>;
> > + interrupts = <0x0 0x4e 0x0>;
> > + usb2-lpm-disable;
> > + usb3-lpm-capable;
> > + };
> > --
> > 2.27.0
> >
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