linux-kernel - Re: [RFC 04/11] dt-bindings: Add HTE bindings

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Date:   Thu, 29 Jul 2021 18:58:47 -0700
From:   Dipen Patel <dipenp@...dia.com>
To:     Rob Herring <robh+dt@...nel.org>
CC:     Thierry Reding <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        <warthog618@...il.com>, <devicetree@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>
Subject: Re: [RFC 04/11] dt-bindings: Add HTE bindings


On 7/1/21 8:54 AM, Rob Herring wrote:
> On Fri, Jun 25, 2021 at 5:48 PM Dipen Patel <dipenp@...dia.com> 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@...dia.com>
>> ---
>>  .../devicetree/bindings/hte/hte-consumer.yaml | 47 +++++++++++
>>  .../devicetree/bindings/hte/hte.yaml          | 34 ++++++++
>>  .../bindings/hte/nvidia,tegra194-hte.yaml     | 83 +++++++++++++++++++
>>  3 files changed, 164 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/hte/hte-consumer.yaml
>>  create mode 100644 Documentation/devicetree/bindings/hte/hte.yaml
>>  create mode 100644 Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/hte/hte-consumer.yaml b/Documentation/devicetree/bindings/hte/hte-consumer.yaml
>> new file mode 100644
>> index 000000000000..79ae1f7d5185
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hte/hte-consumer.yaml
>> @@ -0,0 +1,47 @@
>> +# 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@...dia.com>
>> +
>> +description: |
>> +  HTE properties should be named "htes". The exact meaning of each htes
>> +  property must be documented in the device tree binding for each device.
>> +  An optional property "hte-names" may contain a list of strings to label
>> +  each of the HTE devices listed in the "htes" property.
>> +
>> +  The "hte-names" property if specified is used to map the name of the HTE
>> +  device requested by the devm_of_hte_request_ts() or of_hte_request_ts
>> +  call to an index into the list given by the "htes" property.
>> +
>> +properties:
>> +  htes:
>> +    $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.
>> +
>> +  hte-names:
>> +    $ref: /schemas/types.yaml#/definitions/string-array
>> +    description:
>> +      An optional string property.
>> +
>> +required:
>> +  - "htes"
>> +
>> +dependencies:
>> +  hte-names: [ htes ]
>> +
>> +additionalProperties: true
>> +
>> +examples:
>> +  - |
>> +    hte_irq_consumer {
>> +              htes = <&tegra_hte_lic 0x19>;
>> +              hte-names = "hte-irq";
>> +    };
>> diff --git a/Documentation/devicetree/bindings/hte/hte.yaml b/Documentation/devicetree/bindings/hte/hte.yaml
>> new file mode 100644
>> index 000000000000..e285c38f1a05
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hte/hte.yaml
>> @@ -0,0 +1,34 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/hte/hte.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: HTE providers
>> +
>> +maintainers:
>> +  - Dipen Patel <dipenp@...dia.com>
>> +
>> +properties:
>> +  $nodename:
>> +    pattern: "^hte(@.*|-[0-9a-f])*$"
>> +
>> +  "#hte-cells":
>> +    description:
>> +      Number of cells in a HTE specifier.
>> +
>> +required:
>> +  - "#hte-cells"
>> +
>> +additionalProperties: true
>> +
>> +examples:
>> +  - |
>> +    tegra_hte_aon: hte@...0000 {
>> +              compatible = "nvidia,tegra194-gte-aon";
>> +              reg = <0xc1e0000 0x10000>;
>> +              interrupts = <0 13 0x4>;
>> +              int-threshold = <1>;
>> +              slices = <3>;
>> +              #hte-cells = <1>;
>> +    };
>> \ No newline at end of file
>> 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..bb76cc1971f0
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hte/nvidia,tegra194-hte.yaml
>> @@ -0,0 +1,83 @@
>> +# 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)
> I had to read until here to know what HTE is.
Do you think I should have added more description in commit message of hte.yaml for that matter?
>
> Is there another example of this type of h/w that this should be a
> generic binding?
For now, I have only this hardware.
>
> Rob