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Date:   Sun, 5 Jul 2020 08:30:25 +0800
From:   Chris Ruehl <chris.ruehl@...ys.com.hk>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jack Lo <jack.lo@...ys.com.hk>, devicetree@...r.kernel.org,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] devicetree: hwmon: shtc1: Add sensirion,shtc1.yaml

Hi Guenter,

On 3/7/2020 1:49 pm, Guenter Roeck wrote:
> On 7/2/20 8:48 PM, Chris Ruehl wrote:
>> Add documentation for the newly added DTS support in the shtc1 driver.
>>
>> Signed-off-by: Chris Ruehl <chris.ruehl@...ys.com.hk>
>> ---
>>   .../bindings/hwmon/sensirion,shtc1.yaml       | 53 +++++++++++++++++++
>>   1 file changed, 53 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/hwmon/sensirion,shtc1.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/sensirion,shtc1.yaml b/Documentation/devicetree/bindings/hwmon/sensirion,shtc1.yaml
>> new file mode 100644
>> index 000000000000..e3e292bc6d7d
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/hwmon/sensirion,shtc1.yaml
>> @@ -0,0 +1,53 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/hwmon/sensirion,shtc1.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Sensirion SHTC1 Humidity and Temperature Sensor IC
>> +
>> +maintainers:
>> +  - jdelvare@...e.com
>> +
>> +description: |
>> +  The SHTC1, SHTW1 and SHTC3 are digital humidity and temperature sensor
>> +  designed especially for battery-driven high-volume consumer electronics
>> +  applications.
>> +  For further information refere to Documentation/hwmon/shtc1.rst
>> +
>> +  This binding document describes the binding for the hardware monitor
>> +  portion of the driver.
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - sensirion,shtc1
>> +      - sensirion,shtw1
>> +      - sensirion,shtc3
>> +
>> +  reg: I2C address 0x70
>> +
>> +Optional properties:
>> +  sensirion,blocking_io: |
>> +    u8, if > 0 the i2c bus hold until measure finished (default 0)
>> +  sensirion,high_precision: |
>> +    u8, if > 0 aquire data with high precision (default 1)
>> +
> Why u8 and not boolean ?
>
> Guenter
The author of the driver make high_precision default (recommend) in the code,
if I use boolean, then the device tree _must_ have have the 
sensirion,high_precision set
or I need to do the opposite and define sensirion,low_precision.
(blocking_io = false default, high_precision = true default)

that's the reason I was thinking use a u8 and test with of_property_read_bool to 
check
the presence of it and set it if value > 0.


Chris.

>
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +additionalProperties: false
>> +
>> +Example:
>> +  &i2c1 {
>> +    status = "okay";
>> +    clock-frequency = <400000>;
>> +
>> +    shtc3@70 {
>> +      compatible = "sensirion,shtc3";
>> +      reg = <0x70>
>> +      sensirion,blocking_io = <1>;
>> +      status = "okay";
>> +    };
>> +  };
>>

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