Re: [PATCH v9 1/5] dt-bindings: Introduce SoC sleep stats bindings

Bjorn Andersson
2021-09-24T23:23:21Z

On Mon 06 Sep 00:27 CDT 2021, Maulik Shah wrote:

> From: Mahesh Sivasubramanian <msivasub@codeaurora.org>
>
> Add device binding documentation for Qualcomm Technologies, Inc. (QTI)
> SoC sleep stats driver. The driver is used for displaying SoC sleep
> statistic maintained by Always On Processor or Resource Power Manager.
>
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.org>
> ---
> .../bindings/soc/qcom/soc-sleep-stats.yaml | 48 ++++++++++++++++++++++
> 1 file changed, 48 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/soc/qcom/soc-sleep-stats.yaml
>
> diff --git a/Documentation/devicetree/bindings/soc/qcom/soc-sleep-stats.yaml b/Documentation/devicetree/bindings/soc/qcom/soc-sleep-stats.yaml
> new file mode 100644
> index 0000000..4161156
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/soc-sleep-stats.yaml
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/qcom/soc-sleep-stats.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. (QTI) SoC sleep stats bindings
> +
> +maintainers:
> + - Maulik Shah <mkshah@codeaurora.org>
> + - Lina Iyer <ilina@codeaurora.org>

Lina's address is no longer valid.

> +
> +description:
> + Always On Processor/Resource Power Manager maintains statistics of the SoC
> + sleep modes involving powering down of the rails and oscillator clock.
> +
> + Statistics includes SoC sleep mode type, number of times low power mode were
> + entered, time of last entry, time of last exit and accumulated sleep duration.
> +
> +properties:
> + compatible:
> + enum:
> + - qcom,rpmh-sleep-stats
> + - qcom,rpm-sleep-stats
> +
> + reg:
> + maxItems: 1
> +
> +required:
> + - compatible
> + - reg
> +
> +additionalProperties: false
> +
> +examples:
> + # Example of rpmh sleep stats
> + - |
> + aop_msgram@c3f0048 {
> + compatible = "qcom,rpmh-sleep-stats";
> + reg = <0x0c3f0048 0x400>;

As I tested this series I did find it quite odd that the start address
of this block is $48 bytes into a page and still the length is an even
$400.

Is there any single platform where qcom,rpmh-sleep-stats doesn't start
at an offset of $48 from the beginning of its msgram? Could we move this
number to the driver?

Regards,
Bjorn

> + };
> + # Example of rpm sleep stats
> + - |
> + rpm_msgram@4690000 {
> + compatible = "qcom,rpm-sleep-stats";
> + reg = <0x04690000 0x400>;
> + };
> +...
> --
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>