diff mbox series

[v4,04/11] dt-bindings: Add HTE bindings

Message ID 20220201222630.21246-5-dipenp@nvidia.com
State New
Headers show
Series Intro to Hardware timestamping engine | expand

Commit Message

Dipen Patel Feb. 1, 2022, 10:26 p.m. UTC
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@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
---
 .../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

Comments

Rob Herring (Arm) Feb. 4, 2022, 11:37 p.m. UTC | #1
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@nvidia.com>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> ---
>  .../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@nvidia.com>
> +
> +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@nvidia.com>

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@nvidia.com>
> +
> +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
> 
>
diff mbox series

Patch

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@nvidia.com>
+
+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
+%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@nvidia.com>
+
+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:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description:
+      An optional string property.
+
+required:
+  - hardware-timestamps
+
+dependencies:
+  hardware-timestamp-names: [ hardware-timestamps ]
+
+additionalProperties: true
+
+examples:
+  - |
+    hte_irq_consumer {
+              hardware-timestamps = <&tegra_hte_lic 0x19>;
+              hardware-timestamp-names = "hte-irq";
+    };
diff --git a/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml
new file mode 100644
index 000000000000..c7d2acdb862e
--- /dev/null
+++ b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml
@@ -0,0 +1,82 @@ 
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$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@nvidia.com>
+
+description: |
+  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>;
+    };
+
+...