[PATCH v7 0/8] thermal/drivers/loongson2: Fix trip programming and add Loongson-2K0300 support

[Binbin Zhou <zhoubinbin@loongson.cn>]

This series fixes trip-point handling in the Loongson-2 thermal driver,
refactors the driver around per-SoC chip data, and adds support for the
Loongson-2K0300 thermal sensor.

The Loongson-2K0300's thermal sensor is generally compatible with the
existing Loongson-2K series, but it features several key differences:
1. It has an independent CPU ID register for reading chip version
information.
2. The raw temperature output field has been extended from 8 bits to 11
bits.
3. The temperature calculation formula has been updated to incorporate a
correction factor based on the version information.

To ensure robustness on older hardware revisions, a fallback mechanism
is included: if the calculated temperature falls outside the valid range
(-40 to 125),  the driver falls back to a simpler calculation and prints
a warning.

The first three patches are fixes:

- Patch 1 fixes signed division when converting negative milli-degree
  trip points to degrees Celsius.
- Patch 2 fixes the arguments to clamp() so trip points are limited to
  the supported sensor range.
- Patch 3 fixes Loongson-2K2000 trip-point programming by adding a
  per-SoC register callback and handling the split HI_GATE register.

Patches 4-6 are cleanups and preparation work:

- Patch 4 removes the unnecessary multi-sensor registration loop.
- Patch 5 replaces open-coded bit operations with bitfield helpers and
  splits the per-SoC thermal ops.
- Patch 6 moves the per-SoC ops and hardware initialization into chip
  data.

Patch 7 adds the Loongson-2K0300 DT binding, and patch 8 adds driver
support for the Loongson-2K0300 thermal sensor.

The patchset have been validated on the Loongson-2K series development
boards.

Thanks.
Binbin

=========
V7:
Patch (1/8):
 - New patch;
 - Fix negative temperature conversion in set_trips;
Patch (3/8):
 - Use writew()/writeb() in loongson2_2k2000_set_trips_regs;
Patch (4/8):
 - Rewite the thermal sensor registration loop to clearer;
Patch (5/8):
 - Fix `loognson2_thermal_set_trips` typo;
Patch (8/8):
 - Read CHIP_ID1 only when EXTERN_ID is set;
 - Simplify the Internal ID calculation;
 - Add necessary comments.

Link to V6:
https://lore.kernel.org/all/cover.1790561983.git.zhoubinbin@loongson.cn/

V6:
 - Rebase on linux-pm/thermal;
Patch (2/7):
 - New patch;
 - Fix incorrect clamp() argument order for thermal trip points;
Patch (3/7):
 - New patch;
 - Fix Loongson-2K2000 trip point programming by adding a per-SoC
   set_trips_regs callback and handling the split HI_GATE registers;
Patch (4/7):
 - New patch;
 - cleanup: use GENMASK/FIELD_* helpers, add named constants, and factor
   common trip point setup;
Patch (5/7):
 - New patch;
 - refactor: move thermal_zone_device_ops into chip_data and replace the
   Loongson-2K2000 flag special case with an optional init_extend_resource
   callback;
Patch (7/7):
 - Updated the 10-bit output to 11-bit in commit message;
 - Temporarily remove the implementation of `set_trips`;
 - Remove unnecessary header files;
 - Rewrite `get_temp`, separating `read_calib` and `detect_old_fuse` into
   new functions to be called during the probe;
 - Use macros to define the relevant numbers.

Link to V5:
https://lore.kernel.org/all/cover.1789546118.git.zhoubinbin@loongson.cn/#t

V5:
 - Rebase on linux-pm/thermal;
 - Drop patch-3 for it was applied.

Link to V4:
https://lore.kernel.org/all/cover.1785829933.git.zhoubinbin@loongson.cn/

V4:
 - Rebase on linux-mfd/for-mfd-next;
Patch (3/5):
 - Remove the operation that adds `compatible` to the `select` node.

Link to V3:
https://lore.kernel.org/all/cover.1785480242.git.zhoubinbin@loongson.cn/

V3:
Patch (2/5):
 - New patch for moving thermal_ops to chip_data;
Patch (3/5):
 - Correct spelling errors;
Patch (4/5):
 - Add Acked-by from Conor, thanks;
Patch (5/5):
 - Keep loongson2_thermal_data->chip_data as const, and use
   data->flags as the private data.
 - Renmae LOONGSON2_THSENS_OUT_10B_MASK ->
   LOONGSON2_THSENS_OUT_11B_MASK;

Link to V2:
https://lore.kernel.org/all/cover.1784619512.git.zhoubinbin@loongson.cn/

V2:
Patch (1/4):
 - New patch form Sashiko;
Patch (2/4):
 - New patch for adding chipid syscon compatible;
Patch (3/4):
 - Use `loongson,chipid` phandle replace reg property;
Patch (3/4):
 - Refact `calib_offset` calculate routing;
 - Add LS2K0300_OLD_FUSE_FLAG flag.

Link to V1:
https://lore.kernel.org/all/cover.1783670011.git.zhoubinbin@loongson.cn/

Binbin Zhou (8):
  thermal/drivers/loongson2: Fix negative temperature conversion in
    set_trips
  thermal/drivers/loongson2: Fix clamp() usage for thermal trip points
  thermal/drivers/loongson2: Fix Loongson-2K2000 trip point programming
  thermal/drivers/loongson2: Simplify thermal sensor registration
  thermal/drivers/loongson2: Use bitfields and per-SoC thermal ops
  thermal/drivers/loongson2: Move per-SoC ops into chip data
  dt-bindings: thermal: loongson,ls2k-thermal: Add compatible for
    Loongson-2K0300
  thermal/drivers/loongson2: Add Loongson-2K0300 support

 .../thermal/loongson,ls2k-thermal.yaml        |  73 +++-
 drivers/thermal/loongson2_thermal.c           | 359 ++++++++++++++----
 2 files changed, 332 insertions(+), 100 deletions(-)


base-commit: ec0d89150a9381d591344a9f6f5428655c227a7f
-- 
2.52.0