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Message-ID: <20210712173216.GA2150396@robh.at.kernel.org>
Date: Mon, 12 Jul 2021 11:32:16 -0600
From: Rob Herring <robh@...nel.org>
To: Thara Gopinath <thara.gopinath@...aro.org>
Cc: agross@...nel.org, bjorn.andersson@...aro.org, rui.zhang@...el.com,
daniel.lezcano@...aro.org, viresh.kumar@...aro.org,
rjw@...ysocki.net, tdas@...eaurora.org, mka@...omium.org,
linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [Patch v3 6/6] dt-bindings: thermal: Add dt binding for QCOM LMh
On Thu, Jul 08, 2021 at 08:06:56AM -0400, Thara Gopinath wrote:
> Add dt binding documentation to describe Qualcomm
> Limits Management Hardware node.
>
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
> .../devicetree/bindings/thermal/qcom-lmh.yaml | 100 ++++++++++++++++++
> 1 file changed, 100 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/thermal/qcom-lmh.yaml
>
> diff --git a/Documentation/devicetree/bindings/thermal/qcom-lmh.yaml b/Documentation/devicetree/bindings/thermal/qcom-lmh.yaml
> new file mode 100644
> index 000000000000..7f62bd3d543d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/qcom-lmh.yaml
> @@ -0,0 +1,100 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright 2021 Linaro Ltd.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/thermal/qcom-lmh.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Limits Management Hardware(LMh)
> +
> +maintainers:
> + - Thara Gopinath <thara.gopinath@...aro.org>
> +
> +description:
> + Limits Management Hardware(LMh) is a hardware infrastructure on some
> + Qualcomm SoCs that can enforce temperature and current limits as
> + programmed by software for certain IPs like CPU.
> +
> +properties:
> + compatible:
> + enum:
> + - qcom,sdm845-lmh
> +
> + reg:
> + items:
> + - description: core registers
> +
> + interrupts:
> + maxItems: 1
> +
> + '#interrupt-cells':
> + const: 1
> +
> + interrupt-controller: true
> +
> + qcom,lmh-cpu-id:
> + description:
> + CPU id of the first cpu in the LMh cluster
> + $ref: /schemas/types.yaml#/definitions/uint32
The way we reference other nodes in DT is phandles. 'cpus' is already
somewhat established for this case.
> +
> + qcom,lmh-temperature-arm:
> + description:
> + An integer expressing temperature threshold in millicelsius at which
Use unit suffix when you have units.
> + the LMh thermal FSM is engaged.
> + $ref: /schemas/types.yaml#/definitions/int32
> +
> + qcom,lmh-temperature-low:
> + description:
> + An integer expressing temperature threshold in millicelsius at which
> + the LMh thermal FSM is engaged.
> + $ref: /schemas/types.yaml#/definitions/int32
> +
> + qcom,lmh-temperature-high:
> + description:
> + An integer expressing temperature threshold in millicelsius at which
> + the LMh thermal FSM is engaged.
What's the difference in the 3 properties because the description is the
same.
> + $ref: /schemas/types.yaml#/definitions/int32
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - #interrupt-cells
> + - interrupt-controller
> + - qcom,lmh-cpu-id
> + - qcom,lmh-temperature-arm
> + - qcom,lmh-temperature-low
> + - qcom,lmh-temperature-high
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> + #include <dt-bindings/clock/qcom,rpmh.h>
> + #include <dt-bindings/interconnect/qcom,sdm845.h>
> +
> + lmh_cluster1: lmh@...70800 {
> + compatible = "qcom,sdm845-lmh";
> + reg = <0 0x17d70800 0 0x401>;
> + interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
> + qcom,lmh-cpu-id = <0x4>;
> + qcom,lmh-temperature-arm = <65000>;
> + qcom,lmh-temperature-low = <94500>;
> + qcom,lmh-temperature-high = <95000>;
> + interrupt-controller;
What devices is this an interrupt controller for?
> + #interrupt-cells = <1>;
> + };
> + - |
> + lmh_cluster0: lmh@...78800 {
> + compatible = "qcom,sdm845-lmh";
> + reg = <0 0x17d78800 0 0x401>;
> + interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
> + qcom,lmh-cpu-id = <0x0>;
> + qcom,lmh-temperature-arm = <65000>;
> + qcom,lmh-temperature-low = <94500>;
> + qcom,lmh-temperature-high = <95000>;
> + interrupt-controller;
> + #interrupt-cells = <1>;
> + };
> + - |
> --
> 2.25.1
>
>
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