[PATCH v3 0/3] iio: light: isl29018: overflow/precision fix + cover-glass gain via DT

[Herman van Hazendonk <github.com@herrie.org>]

v3:
 - Split the DT binding into its own commit per maintainer feedback
   on v2 (binding must precede the driver patch that consumes the
   new property).  The series is now 3 patches in dependency order:
   precision fix -> binding -> driver.

 - PATCH 1/3: tighten the precision fix.  v2 widened the intermediate
   arithmetic to u64 but still discarded the sub-lux remainder before
   applying calibscale, which collapsed to zero on low ranges with
   large cover-glass gain.  v3 keeps the remainder via div_u64_rem()
   so even small counts contribute.  Switching from '/' and '%' on
   u64 to div_u64()/div_u64_rem() also restores the ARM32 build,
   which v2 broke with __aeabi_uldivmod.

 - PATCH 3/3 (driver) addresses Andy's review of v2:
     * hoist 'struct device *dev = &client->dev;' so subsequent
       device_property_*() and devm_*() calls are uniform;
     * guard the property read with device_property_present() and
       surface the failure with dev_err_probe(), rather than silently
       falling back when device_property_read_u32() returns -EINVAL
       on a malformed value;
     * the silent fallback (calibscale = 1) only applies when the
       property is genuinely absent, which matches the tsl2563.c
       precedent.

PATCH 2/3 is the new standalone binding commit; the schema, default,
and rationale are unchanged from v2.

A follow-up DTS patch enabling this for the HP TouchPad will be sent
separately to the ARM/DTS tree once the driver change is upstream.

Herman van Hazendonk (3):
  iio: light: isl29018: fix overflow and precision in
    isl29018_read_lux()
  dt-bindings: iio: light: isl29018: add isil,cover-comp-gain
  iio: light: isl29018: support cover-glass gain compensation via DT

 .../bindings/iio/light/isl29018.yaml          | 13 ++++++++
 drivers/iio/light/isl29018.c                  | 31 ++++++++++++++-----
 2 files changed, 37 insertions(+), 7 deletions(-)


base-commit: 944125b4c454b58d2fe6e35f1087a932b2050dff
-- 
2.43.0