[PATCH V7 1/2] dt-bindings: firmware: bootstats: Add the dtschema
Souradeep Chowdhury
quic_schowdhu at quicinc.com
Wed Jul 5 01:33:47 PDT 2023
On 7/5/2023 11:47 AM, Krzysztof Kozlowski wrote:
> On 05/07/2023 07:32, Souradeep Chowdhury wrote:
>> Add the device tree bindings for boot stats. This has 2 properties
>> pre-abl-time and abl-time which records the timestamps for boot
>> stats.
>>
>> Signed-off-by: Souradeep Chowdhury <quic_schowdhu at quicinc.com>
>> Link: https://lore.kernel.org/linux-arm-kernel/7d397e67-5d56-4975-98af-1ac9746c07f4@app.fastmail.com/
>> ---
>> .../bindings/firmware/qcom,bootstats.yaml | 38 +++++++++++++++++++
>> 1 file changed, 38 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/firmware/qcom,bootstats.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/firmware/qcom,bootstats.yaml b/Documentation/devicetree/bindings/firmware/qcom,bootstats.yaml
>> new file mode 100644
>> index 000000000000..22e697524058
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/firmware/qcom,bootstats.yaml
>> @@ -0,0 +1,38 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/firmware/qcom,bootstats.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Boot Stats
>
> This explains nothing...
Ack
>
>> +
>> +maintainers:
>> + - Souradeep Chowdhury <quic_schowdhu at quicinc.com>
>> +
>> +description: |
>
> Drop |
Ack
>
>> + Qualcomm's proprietary Android boot-loaders capture boot time
>
> Wrong indentation.
Ack
>
>> + stats, like the time when the bootloader started execution and
>> + at what point the bootloader handed over control to the kernel.
>> + This is captured in the unit of ms in devicetree property.
>> +
>> +properties:
>> + pre-abl-time:
>> + description: The property to store the starting point of abl in ms.
>
> String instead of ms? No, this is the craziest idea I saw recently. Use
> -ms suffix.
>
>> + $ref: /schemas/types.yaml#/definitions/string-array
>> +
>> + abl-time:
>> + description: The property to store the duration of abl in ms.
>> + $ref: /schemas/types.yaml#/definitions/string-array
>
> I have no clue what this entire binding is about. Nothing can bind to
> it, no usage explained. Properties are not used to "store the duration".
> This does not look like suitable for DT, drop entire binding.
This binding was created as per the suggestion on version 6 of the patch
by Arnd. The idea was that these 2 devicetree properties will be used to
populate the bootstat values from the bootloader and exposed to the user
via /sys/firmware/devicetree/ directly.
Details in the link below:-
https://lore.kernel.org/lkml/7d397e67-5d56-4975-98af-1ac9746c07f4@app.fastmail.com/T/#mbdc9ad95fcbb5ad7b56c6996a3933899b42d982c
Can you suggest any alternative way to represent this as a binding?
>
>> +
>> +required:
>> + - pre-abl-time
>> + - abl-time
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> + - |
>> + bootstats {
>> + pre-abl-time="17627";
>> + abl-time="26748";
>
> Missing spaces. Open existing DTS and look at existing coding style.
Ack
>
> Best regards,
> Krzysztof
>
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