On Tue, Feb 01, 2022 at 02:26:23PM -0800, Dipen Patel wrote: > Introduces HTE devicetree binding details for the HTE subsystem. It > includes examples for the consumers, binding details for the providers > and specific binding details for the Tegra194 based HTE providers. > > Signed-off-by: Dipen Patel <dipenp@xxxxxxxxxx> > Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > --- > .../hte/hardware-timestamps-common.yaml | 29 +++++++ > .../devicetree/bindings/hte/hte-consumer.yaml | 44 ++++++++++ > .../bindings/hte/nvidia,tegra194-hte.yaml | 82 +++++++++++++++++++ > 3 files changed, 155 insertions(+) > create mode 100644 Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml > create mode 100644 Documentation/devicetree/bindings/hte/hte-consumer.yaml > create mode 100644 Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml > > diff --git a/Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml b/Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml > new file mode 100644 > index 000000000000..ee6f94890695 > --- /dev/null > +++ b/Documentation/devicetree/bindings/hte/hardware-timestamps-common.yaml > @@ -0,0 +1,29 @@ > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/hte/hardware-timestamps-common.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Hardware timestamp providers > + > +maintainers: > + - Dipen Patel <dipenp@xxxxxxxxxx> > + > +description: | > + Some devices/SoCs have hardware time stamping engines which can use hardware > + means to timestamp entity in realtime. The entity could be anything from > + GPIOs, IRQs, Bus and so on. The hardware timestamp engine (HTE) present > + itself as a provider with the bindings described in this document. > + > +properties: > + $nodename: > + pattern: "^hardware-timestamp(@.*|-[0-9a-f])?$" > + > + "#hardware-timestamp-cells": > + description: > + Number of cells in a HTE specifier. > + > +required: > + - "#hardware-timestamp-cells" > + > +additionalProperties: true > diff --git a/Documentation/devicetree/bindings/hte/hte-consumer.yaml b/Documentation/devicetree/bindings/hte/hte-consumer.yaml > new file mode 100644 > index 000000000000..bb1232b31455 > --- /dev/null > +++ b/Documentation/devicetree/bindings/hte/hte-consumer.yaml > @@ -0,0 +1,44 @@ > +# SPDX-License-Identifier: GPL-2.0 dual license > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/hte/hte-consumer.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: HTE Consumer Device Tree Bindings > + > +maintainers: > + - Dipen Patel <dipenp@xxxxxxxxxx> select: true Or this is never applied. > + > +description: | > + HTE properties should be named "hardware-timestamps". The exact meaning of > + each hardware-timestamps property must be documented in the device tree > + binding for each device. An optional property "hardware-timestamp-names" may > + contain a list of strings to label each of the HTE devices listed in the > + "hardware-timestamps" property. > + > +properties: > + hardware-timestamps: > + $ref: /schemas/types.yaml#/definitions/phandle-array > + description: > + The list of HTE provider phandle. The provider must document the number > + of cell that must be passed in this property along with phandle. > + > + hardware-timestamp-names: > + $ref: /schemas/types.yaml#/definitions/string-array > + description: > + An optional string property. > + > +required: > + - hardware-timestamps And drop this or it will then fail everywhere. > + > +dependencies: > + hardware-timestamp-names: [ hardware-timestamps ] > + > +additionalProperties: true > + > +examples: > + - | > + hte_irq_consumer { > + hardware-timestamps = <&tegra_hte_lic 0x19>; > + hardware-timestamp-names = "hte-irq"; > + }; > diff --git a/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml > new file mode 100644 > index 000000000000..c7d2acdb862e > --- /dev/null > +++ b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml > @@ -0,0 +1,82 @@ > +# SPDX-License-Identifier: GPL-2.0 Dual license. > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/hte/nvidia,tegra194-hte.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Tegra194 on chip generic hardware timestamping engine (HTE) > + > +maintainers: > + - Dipen Patel <dipenp@xxxxxxxxxx> > + > +description: | Don't need '|' if no formatting. > + Tegra194 SoC has multiple generic hardware timestamping engines (GTE) which > + can monitor subset of GPIO and on chip IRQ lines for the state change, upon > + detection it will record timestamp (taken from system counter) in its > + internal hardware FIFO. It has a bitmap array arranged in 32bit slices where > + each bit represent signal/line to enable or disable for the hardware > + timestamping. > + > +properties: > + compatible: > + enum: > + - nvidia,tegra194-gte-aon > + - nvidia,tegra194-gte-lic > + > + reg: > + maxItems: 1 > + > + interrupts: > + maxItems: 1 > + > + nvidia,int-threshold: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + HTE device generates its interrupt based on this u32 FIFO threshold > + value. The recommended value is 1. > + minimum: 1 > + maximum: 256 > + > + nvidia,slices: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + HTE lines are arranged in 32 bit slice where each bit represents different > + line/signal that it can enable/configure for the timestamp. It is u32 > + property and depends on the HTE instance in the chip. The value 3 is for > + GPIO GTE and 11 for IRQ GTE. > + enum: [3, 11] > + > + '#hardware-timestamp-cells': > + const: 1 > + > +required: > + - compatible > + - reg > + - interrupts > + - nvidia,slices > + - "#hardware-timestamp-cells" > + > +additionalProperties: false > + > +examples: > + - | > + tegra_hte_aon: hardware-timestamp@c1e0000 { > + compatible = "nvidia,tegra194-gte-aon"; > + reg = <0xc1e0000 0x10000>; > + interrupts = <0 13 0x4>; > + nvidia,int-threshold = <1>; > + nvidia,slices = <3>; > + #hardware-timestamp-cells = <1>; > + }; > + > + - | > + tegra_hte_lic: hardware-timestamp@3aa0000 { > + compatible = "nvidia,tegra194-gte-lic"; > + reg = <0x3aa0000 0x10000>; > + interrupts = <0 11 0x4>; > + nvidia,int-threshold = <1>; > + nvidia,slices = <11>; > + #hardware-timestamp-cells = <1>; > + }; > + > +... > -- > 2.17.1 > >
