linux-kernel - Re: [PATCH v4 1/3] dt-bindings: thermal: Add yaml bindings for thermal sensors

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Message-ID: <CAHLCerMvwfBEGO6O9kHMg14AfJ1bEO7ZP4i=SH3XO6HCKucVKQ@mail.gmail.com>
Date:   Wed, 1 Apr 2020 19:08:13 +0530
From:   Amit Kucheria <amit.kucheria@...durent.com>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>, Rob Herring <robh@...nel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] dt-bindings: thermal: Add yaml bindings for
 thermal sensors

On Wed, Apr 1, 2020 at 6:10 PM Lukasz Luba <lukasz.luba@....com> wrote:
>
>
>
> On 4/1/20 12:15 PM, Amit Kucheria wrote:
> > As part of moving the thermal bindings to YAML, split it up into 3
> > bindings: thermal sensors, cooling devices and thermal zones.
> >
> > The property #thermal-sensor-cells is required in each device that acts
> > as a thermal sensor. It is used to uniquely identify the instance of the
> > thermal sensor inside the system.
> >
> > Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> > Reviewed-by: Rob Herring <robh@...nel.org>
> > ---
> >   .../bindings/thermal/thermal-sensor.yaml      | 72 +++++++++++++++++++
> >   1 file changed, 72 insertions(+)
> >   create mode 100644 Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/thermal/thermal-sensor.yaml b/Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
> > new file mode 100644
> > index 0000000000000..920ee7667591d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/thermal/thermal-sensor.yaml
> > @@ -0,0 +1,72 @@
> > +# SPDX-License-Identifier: (GPL-2.0)
> > +# Copyright 2020 Linaro Ltd.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/thermal/thermal-sensor.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Thermal sensor binding
> > +
> > +maintainers:
> > +  - Amit Kucheria <amitk@...nel.org>
> > +
> > +description: |
> > +  Thermal management is achieved in devicetree by describing the sensor hardware
> > +  and the software abstraction of thermal zones required to take appropriate
> > +  action to mitigate thermal overloads.
> > +
> > +  The following node types are used to completely describe a thermal management
> > +  system in devicetree:
> > +   - thermal-sensor: device that measures temperature, has SoC-specific bindings
> > +   - cooling-device: device used to dissipate heat either passively or artively
>
> s/artively/actively
>
> > +   - thermal-zones: a container of the following node types used to describe all
> > +     thermal data for the platform
> > +
> > +  This binding describes the thermal-sensor.
> > +
> > +  Thermal sensor devices provide temperature sensing capabilities on thermal
> > +  zones. Typical devices are I2C ADC converters and bandgaps. Thermal sensor
> > +  devices may control one or more internal sensors.
> > +
> > +properties:
> > +  "#thermal-sensor-cells":
> > +    description:
> > +      Used to uniquely identify a thermal sensor instance within an IC. Will be
> > +      0 on sensor nodes with only a single sensor and at least 1 on nodes
> > +      containing several internal sensors.
> > +    enum: [0, 1]
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > +    // Example 1: SDM845 TSENS
> > +    soc: soc@0 {
> > +            #address-cells = <2>;
> > +            #size-cells = <2>;
> > +
> > +            /* ... */
> > +
> > +            tsens0: thermal-sensor@...3000 {
> > +                    compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
> > +                    reg = <0 0x0c263000 0 0x1ff>, /* TM */
> > +                          <0 0x0c222000 0 0x1ff>; /* SROT */
> > +                    #qcom,sensors = <13>;
> > +                    interrupts = <GIC_SPI 506 IRQ_TYPE_LEVEL_HIGH>,
> > +                                 <GIC_SPI 508 IRQ_TYPE_LEVEL_HIGH>;
> > +                    interrupt-names = "uplow", "critical";
> > +                    #thermal-sensor-cells = <1>;
> > +            };
> > +
> > +            tsens1: thermal-sensor@...5000 {
> > +                    compatible = "qcom,sdm845-tsens", "qcom,tsens-v2";
> > +                    reg = <0 0x0c265000 0 0x1ff>, /* TM */
> > +                          <0 0x0c223000 0 0x1ff>; /* SROT */
> > +                    #qcom,sensors = <8>;
> > +                    interrupts = <GIC_SPI 507 IRQ_TYPE_LEVEL_HIGH>,
> > +                                 <GIC_SPI 509 IRQ_TYPE_LEVEL_HIGH>;
> > +                    interrupt-names = "uplow", "critical";
> > +                    #thermal-sensor-cells = <1>;
> > +            };
> > +    };
> > +...
> >
>
> Apart from the above, looks good.
>
> Reviewed-by: Lukasz Luba <lukasz.luba@....com>

Thanks for the review. Will spin a v5 with those trivial fixes.