Heinrich Toews
c2a493f4bd
Add Device Tree child-node parsing to the wago-m4-led-wrapper driver so
that individual LEDs on the M4 strip can be named from DTS, matching the
convention used by drivers such as nxp,pca9552.
Driver changes (drivers/leds/rgb/wago-m4-led-wrapper.c):
- Add #include <linux/property.h> for fwnode helpers.
- Extract common sub-LED initialisation into wago_led_init_subled().
- In wago_led_register_leds(), count child nodes first:
* If child nodes are present, iterate them with
device_for_each_child_node(); read the 'reg' property to determine
the strip index, populate led_init_data.fwnode, and register via
devm_led_classdev_multicolor_register_ext(). The LED core then
reads the 'label' and 'linux,default-trigger' properties from the
child node automatically.
* If no child nodes are present, fall back to the previous hard-coded
'wago-m4-led-wrapper:<m4-ledN>' naming so existing deployments are
unaffected.
DTS change (arch/arm64/boot/dts/ti/k3-am623-pfc-750-8400.dts):
- Add #address-cells = <1> / #size-cells = <0> to the leds-m4 node.
- Add led@0 .. led@9 child nodes with 'reg' and 'label' properties,
using the same names as the PCA9552 multicolor LED groups (sys, run,
io, em, u1 .. u6) so /sys/class/leds/ entries match across both
LED controllers.
Signed-off-by: Heinrich Toews <ht@twx-software.de>
Linux kernel
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