linux-kernel - Re: [PATCH v3 1/4] dt-bindings: thermal: k3: Add VTM bindings documentation

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Date:   Thu, 20 Feb 2020 09:42:58 +0530
From:   Keerthy <j-keerthy@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <rui.zhang@...el.com>, <daniel.lezcano@...aro.org>,
        <amit.kucheria@...durent.com>, <t-kristo@...com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
        <mark.rutland@....com>
Subject: Re: [PATCH v3 1/4] dt-bindings: thermal: k3: Add VTM bindings
 documentation



On 19/02/20 8:22 pm, Rob Herring wrote:
> On Wed, Feb 19, 2020 at 01:13:11PM +0530, Keerthy wrote:
>> Add VTM bindings documentation. In the Voltage Thermal
>> Management Module(VTM), K3 AM654 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>
>> ---
>>
>> Changes in v3:
>>
>>    * Fixed errors seen with:
>>      dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml
>>
>>   .../bindings/thermal/ti,am654-thermal.yaml    | 57 +++++++++++++++++++
>>   1 file changed, 57 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml
>> new file mode 100644
>> index 000000000000..b6dc95c3acab
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/thermal/ti,am654-thermal.yaml
>> @@ -0,0 +1,57 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/thermal/ti,am654-thermal.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Texas Instruments AM654 VTM (DTS) binding
>> +
>> +maintainers:
>> +  - Keerthy <j-keerthy@...com>
>> +
>> +properties:
>> +  compatible:
>> +    const: ti,am654-vtm
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  power-domains:
>> +    maxItems: 1
>> +    description: phandle to the associated power domain
> 
> No need to redefine a standard property description.

Okay.

> 
>> +
>> +  "#thermal-sensor-cells":
>> +    const: 1
>> +
>> +required:
>> +  - "#thermal-sensor-cells"
>> +  - compatible
>> +  - reg
>> +  - power-domains
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/soc/ti,sci_pm_domain.h>
>> +    vtm: wkup_vtm0@...50000 {
> 
> thermal-sensor@...
> 
> Use generic node names and don't use '_' in node names

vtm stands for voltage thermal manager and comprises of multiple 
sensors. This is similar to omap bandgap. Should i replace vtm with more 
generic name like thermal? as used in:

Documentation/devicetree/bindings/thermal/st,stm32-thermal.yaml

- Keerthy

> 
>> +        compatible = "ti,am654-vtm";
>> +        reg = <0x0 0x42050000 0x0 0x25c>;
>> +        power-domains = <&k3_pds 80 TI_SCI_PD_EXCLUSIVE>;
>> +        #thermal-sensor-cells = <1>;
>> +    };
>> +
>> +    mpu0_thermal: mpu0_thermal {
>> +        polling-delay-passive = <250>; /* milliseconds */
>> +        polling-delay = <500>; /* milliseconds */
>> +        thermal-sensors = <&vtm0 0>;
>> +
>> +        trips {
>> +                mpu0_crit: mpu0_crit {
>> +                        temperature = <125000>; /* milliCelsius */
>> +                        hysteresis = <2000>; /* milliCelsius */
>> +                        type = "critical";
>> +                };
>> +        };
>> +    };
>> +...
>> -- 
>> 2.17.1
>>