linux-kernel - Re: [PATCH v4 1/4] dt-bindings: thermal: k3-j72xx: Add VTM bindings documentation

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Message-ID: <YY7HvCyJ90Ge8mr7@robh.at.kernel.org>
Date:   Fri, 12 Nov 2021 13:59:56 -0600
From:   Rob Herring <robh@...nel.org>
To:     Keerthy <j-keerthy@...com>
Cc:     daniel.lezcano@...aro.org, rui.zhang@...el.com, amitk@...nel.org,
        kristo@...nel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/4] dt-bindings: thermal: k3-j72xx: Add VTM bindings
 documentation

On Wed, Nov 03, 2021 at 02:49:21PM +0530, Keerthy wrote:
> Add VTM bindings documentation. In the Voltage Thermal
> Management Module(VTM), K3 J72XX supplies a voltage
> reference and a temperature sensor feature that are gathered in the band
> gap voltage and temperature sensor (VBGAPTS) module. The band
> gap provides current and voltage reference for its internal
> circuits and other analog IP blocks. The analog-to-digital
> converter (ADC) produces an output value that is proportional
> to the silicon temperature.
> 
> Signed-off-by: Keerthy <j-keerthy@...com>
> ---
>  .../bindings/thermal/ti,j72xx-thermal.yaml    | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
> 
> diff --git a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
> new file mode 100644
> index 000000000000..8483c495cb9a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
> @@ -0,0 +1,62 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/thermal/ti,j72xx-thermal.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Texas Instruments J72XX VTM (DTS) binding
> +
> +maintainers:
> +  - Keerthy <j-keerthy@...com>
> +
> +properties:
> +  compatible:
> +    const: ti,j721e-vtm
> +    oneOf:
> +      - enum:
> +          - ti,j721e-vtm
> +          - ti,j7200-vtm

Again, this isn't correct. In C like logic, it is saying compatible is 
(ti,j721e-vtm && (ti,j721e-vtm || ti,j7200-vtm)) which is just 
'ti,j721e-vtm'. I think you want just the 'enum'.

> +
> +  reg:
> +    maxItems: 3

What is each entry?

> +
> +  power-domains:
> +    maxItems: 1
> +
> +  "#thermal-sensor-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - power-domains
> +  - "#thermal-sensor-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/soc/ti,sci_pm_domain.h>
> +    wkup_vtm0: wkup_vtm0@...40000 {

thermal-sensor@...

> +        compatible = "ti,j721e-vtm";
> +        reg = <0x42040000 0x350>,
> +            <0x42050000 0x350>,
> +            <0x43000300 0x10>;
> +        power-domains = <&k3_pds 154 TI_SCI_PD_EXCLUSIVE>;
> +        #thermal-sensor-cells = <1>;
> +    };
> +
> +    mpu_thermal: mpu_thermal {

mpu-thermal

> +        polling-delay-passive = <250>; /* milliseconds */
> +        polling-delay = <500>; /* milliseconds */
> +        thermal-sensors = <&wkup_vtm0 0>;
> +
> +        trips {
> +                mpu_crit: mpu_crit {

mpu-crit

> +                        temperature = <125000>; /* milliCelsius */
> +                        hysteresis = <2000>; /* milliCelsius */
> +                        type = "critical";
> +                };
> +        };
> +    };
> +...
> -- 
> 2.17.1
> 
>