On Wed, Aug 26, 2026 at 07:54:05PM +0200, Jorijn van der Graaf wrote:
> The i2c device IDs were introduced in capitals, mirroring the ACPI
> _HID entries added by the same commit be9e6229d676 ("iio: light: Add
> support for Sensortek STK3310"); at that point the driver enumerated
> through ACPI only, with no OF table and no i2c module alias export.
> ACPI _HIDs have their own naming rules; i2c device names
> conventionally use the lower-case part name, matching the devicetree
> compatible suffix.
>
> The spelling is visible: a client instantiated through the i2c sysfs
> interface under the lower-case name taken from a compatible string
> binds through the OF table's name fallback, but has no firmware node,
> so i2c_match_id() is the only way for it to reach driver match data,
> and its string comparison is case-sensitive, so the capitals can never
> match. Lower-case the names so such clients match the id table, and
> receive the per-chip match data a subsequent change attaches to it.
>
> The module aliases follow the rename (i2c:STK3310 becomes
> i2c:stk3310), and a sysfs client instantiated under a capitals name no
> longer binds.
Reviewed-by: Andy Shevchenko <[email protected]>
with all responsibility for the theoretically possible breakages
of the weird setups. But I strongly believe that no one is using
capital letters for I²C instantiation of this driver as it was
submitted for ACPI use and followed by DT support.
--
With Best Regards,
Andy Shevchenko
