linux-kernel - [PATCH v2 0/2] add support for MCP998X

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Message-ID: <20250529093628.15042-1-victor.duicu@microchip.com>
Date: Thu, 29 May 2025 12:36:26 +0300
From: <victor.duicu@...rochip.com>
To: <jic23@...nel.org>, <dlechner@...libre.com>, <nuno.sa@...log.com>,
	<andy@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>
CC: <marius.cristea@...rochip.com>, <victor.duicu@...rochip.com>,
	<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>
Subject: [PATCH v2 0/2] add support for MCP998X

From: Victor Duicu <victor.duicu@...rochip.com>

Add support for Microchip MCP998X/33 and MCP998XD/33D
Multichannel Automotive Temperature Monitor Family.

The chips in the family have different numbers of external
channels, ranging from 1 (MCP9982) to 4 channels (MCP9985).
Reading diodes in anti-parallel connection is supported
by MCP9984/85/33 and MCP9984D/85D/33D.
Dedicated hardware shutdown circuitry is present only
in MCP998XD and MCP9933D.

Current version of driver does not support interrupts, events and data
buffering.

Differences related to previous patch:
v2:
- move hysteresis, extended temperature range and beta parameters
  from devicetree into user space.
- edit comments in yaml and driver.
- remove "|" in descpriptions, remove "+" from PatternProperties in yaml.
- add default to microchip,ideality-factor, delete blank lines and wrap to
  80 chars in yaml.
- remove variables with upper case.
- add check for microchip,apdd-state and microchip,recd34 in yaml.
- improve coding style in driver code.
- add includes for all functions used.
- rename MCP9982_INT_HIGH_BYTE_ADDR to MCP9982_INT_VALUE_ADDR and
  MCP9982_INT_LOW_BYTE_ADDR to MCP9982_FRAC_VALUE_ADDR.
- remove custom attribute running_average_window and
  running_average_window_available and map them to a low pass filter.
- update sysfs-bus-iio-temperature-mcp9982 to reflect current
  driver attributes and point to next kernel version (6.17).
- use compound literal to define driver channels.
- replace device_property_read_string() with i2c_get_match_data() to read
  chip name from devicetree.
- remove MCP9982_DEV_ATTR and mcp9982_prep_custom_attributes().
- remove client, chip_name, iio_info from mcp9982_priv.
- replace sprintf() with sysfs_emit().
- remove error messages which are triggered by keyboard input.
- replace devm_kzalloc() with devm_kcalloc(), array mcp9982_chip_config[] with
  individual structures, device_property_present() with device_property_read_bool().
- reordered parameters in mcp9982_features and mcp9982_priv to optimize memory
  allocation.
- remove .endianness from channel properties.
- change name of some parameters in mcp9982_priv.
- add check for reg value 0 from devicetree (channel 0 is for internal temperature
  and can't be disabled).

v1:
- inital version.

Victor Duicu (2):
  dt-bindings: iio: temperature: add support for MCP998X
  iio: temperature: add support for MCP998X

 .../testing/sysfs-bus-iio-temperature-mcp9982 |  27 +
 .../iio/temperature/microchip,mcp9982.yaml    | 174 ++++
 MAINTAINERS                                   |   7 +
 drivers/iio/temperature/Kconfig               |  10 +
 drivers/iio/temperature/Makefile              |   1 +
 drivers/iio/temperature/mcp9982.c             | 866 ++++++++++++++++++
 6 files changed, 1085 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-temperature-mcp9982
 create mode 100644 Documentation/devicetree/bindings/iio/temperature/microchip,mcp9982.yaml
 create mode 100644 drivers/iio/temperature/mcp9982.c


base-commit: 0c86e33819785fe50616b6ee3fb35c1e4be406d5
-- 
2.48.1