Upstream dropped support for legacy driver [0]. Rewrite the driver like
the renesas pwm driver [1].
Fixes erros in the form of:
make: *** [/__w/openwrt/openwrt/openwrt/include/toplevel.mk:232: target/compile] Error 1
====== Make errors from logs/target/linux/compile.txt ======
| ^~~~~~~~~~~~~~
drivers/pwm/pwm-mediatek-ramips.c:107:19: note: (near initialization for 'mtk_pwm_ops.free')
drivers/pwm/pwm-mediatek-ramips.c:108:10: error: 'const struct pwm_ops' has no member named 'disable'
108 | .disable = mtk_pwm_disable,
| ^~~~~~~
drivers/pwm/pwm-mediatek-ramips.c:108:20: error: initialization of 'int (*)(struct pwm_chip *, struct pwm_device *, struct pwm_capture *, long unsigned int)' from incompatible pointer type 'void (*)(struct pwm_chip *, struct pwm_device *)' [-Werror=incompatible-pointer-types]
108 | .disable = mtk_pwm_disable,
| ^~~~~~~~~~~~~~~
drivers/pwm/pwm-mediatek-ramips.c:108:20: note: (near initialization for 'mtk_pwm_ops.capture')
cc1: all warnings being treated as errors
[0] - 0829c35dc5
[1] - ec00cd5e63
Signed-off-by: Nick Hainke <vincent@systemli.org>
eeeb0b5349