[][openwrt][mt7988][integration][Add basic Filogic 880 SoC support]

[Description]
Add basic filogic 880 SoC support to openwrt 21.02

[Release-log]

Change-Id: I57791df2e9f9f4729cb2d32f734090de52c370f2
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6592143
Build: srv_hbgsm110
diff --git a/target/linux/mediatek/patches-5.4/0932-add-pwm-feature-in-mt7988-project.patch b/target/linux/mediatek/patches-5.4/0932-add-pwm-feature-in-mt7988-project.patch
new file mode 100644
index 0000000..8268e7d
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0932-add-pwm-feature-in-mt7988-project.patch
@@ -0,0 +1,25 @@
+diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
+index 3a5a456..6d6206e 100644
+--- a/drivers/pwm/pwm-mediatek.c
++++ b/drivers/pwm/pwm-mediatek.c
+@@ -350,6 +350,12 @@ static const struct pwm_mediatek_of_data mt7986_pwm_data = {
+ 	.reg_ver = REG_V2,
+ };
+ 
++static const struct pwm_mediatek_of_data mt7988_pwm_data = {
++	.num_pwms = 8,
++	.pwm45_fixup = false,
++	.reg_ver = REG_V2,
++};
++
+ static const struct pwm_mediatek_of_data mt8516_pwm_data = {
+ 	.num_pwms = 5,
+ 	.pwm45_fixup = false,
+@@ -364,6 +370,7 @@ static const struct of_device_id pwm_mediatek_of_match[] = {
+ 	{ .compatible = "mediatek,mt7629-pwm", .data = &mt7629_pwm_data },
+ 	{ .compatible = "mediatek,mt7981-pwm", .data = &mt7981_pwm_data },
+ 	{ .compatible = "mediatek,mt7986-pwm", .data = &mt7986_pwm_data },
++	{ .compatible = "mediatek,mt7988-pwm", .data = &mt7988_pwm_data },
+ 	{ .compatible = "mediatek,mt8516-pwm", .data = &mt8516_pwm_data },
+ 	{ },
+ };