Hi Rob, I will implement your review comments in next patch. Thanks for the review. On 2/4/22 3:37 PM, Rob Herring wrote: > 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 >> >>
