linux-kernel - Re: [PATCH v2 2/3] docs: hwmon: add max31732 documentation

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Message-ID: <20221229153957.GA24429@roeck-us.net>
Date:   Thu, 29 Dec 2022 07:39:57 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Sinan Divarci <Sinan.Divarci@...log.com>
Cc:     jdelvare@...e.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] docs: hwmon: add max31732 documentation

On Wed, Dec 14, 2022 at 05:22:05PM +0300, Sinan Divarci wrote:
> Adding documentation for max31732 quad remote temperature sensor
> 
> Signed-off-by: Sinan Divarci <Sinan.Divarci@...log.com>
> ---
>  Documentation/hwmon/index.rst    |  1 +
>  Documentation/hwmon/max31732.rst | 62 ++++++++++++++++++++++++++++++++
>  2 files changed, 63 insertions(+)
>  create mode 100644 Documentation/hwmon/max31732.rst
> 
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index fe2cc6b73..e521bf555 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -133,6 +133,7 @@ Hardware Monitoring Kernel Drivers
>     max20751
>     max31722
>     max31730
> +   max31732
>     max31760
>     max31785
>     max31790
> diff --git a/Documentation/hwmon/max31732.rst b/Documentation/hwmon/max31732.rst
> new file mode 100644
> index 000000000..67bfcf393
> --- /dev/null
> +++ b/Documentation/hwmon/max31732.rst
> @@ -0,0 +1,62 @@
> +.. SPDX-License-Identifier: GPL-2.0-or-later
> +
> +Kernel driver max31732
> +======================
> +
> +Supported chips:
> +
> +  * Analog Devices MAX31732
> +
> +    Prefix: 'max31732'
> +
> +    Addresses scanned: none
> +
> +Author: Sinan Divarci <Sinan.Divarci@...log.com>
> +
> +
> +Description
> +-----------
> +
> +This driver implements support for Maxim MAX31732.
> +
> +The MAX31732 is a multi-channel temperature sensor that monitors its
> +own temperature and the temperatures of up to four external diodeconnected
> +transistors. The device operates with 3.0V to 3.6V supply range
> +and consume TBDμA of current in standby mode of operation. Resistance

TBDμA ?

> +cancellation feature compensates for high series resistance between
> +circuit-board traces and the external thermal diode, while beta
> +compensation corrects for temperature-measurement errors due to lowbeta
> +sensing transistors.
> +
> +The MAX31732 offers two open-drain, active-low alarm outputs,
> +ALARM1 and ALARM2. When the measured temperature of a channel
> +crosses the respective primary over/under temperature threshold levels
> +ALARM1 asserts low and a status bit is set in the corresponding thermal
> +status registers. When the measured temperature of a channel crosses the
> +secondary over/under temperature threshold levels, ALARM2 asserts low
> +and a status bit is set in the corresponding thermal status registers.
> +
> +Temperature measurement range: from -64°C to 150°C
> +
> +Temperature Resolution: 12 Bits, ±0.0625°C
> +
> +Sysfs entries
> +-------------
> +
> +===================== == =======================================================
> +temp[1-5]_enable      RW Temperature enable/disable
> +                         Set to 1 to enable channel, 0 to disable
> +temp[1-5]_input       RO Temperature input
> +temp[2-5]_fault       RO Fault indicator for remote channels
> +temp[1-5]_max         RW Temperature max value. Asserts "ALARM1" pin when exceeded
> +temp[1-5]_max_alarm   RO Temperature max alarm status
> +temp[1-5]_crit        RW Temperature critical value. Asserts "ALARM2" pin when exceeded
> +temp[1-5]_crit_alarm  RO Temperature critical alarm status
> +temp[1-5]_min         RW Temperature min value. Common for all channels.
> +                         Only temp1_min is writeable. Asserts "ALARM1" pin when exceeded
> +temp[1-5]_min_alarm   RO Temperature min alarm status
> +temp[1-5]_lcrit       RW Temperature critical low value. Common for all channels.
> +                         Only temp1_min is writeable. Asserts "ALARM2" pin when exceeded
> +temp[1-5]_lcrit_alarm RO Temperature critical low alarm status
> +temp[2-5]_offset      RW Temperature offset for remote channels
> +===================== == =======================================================