diff --git a/target/linux/mediatek/patches-5.4/0931-pwm-add-mt7981-support.patch b/target/linux/mediatek/patches-5.4/0931-pwm-add-mt7981-support.patch
new file mode 100644
index 0000000..d8b8434
--- /dev/null
+++ b/target/linux/mediatek/patches-5.4/0931-pwm-add-mt7981-support.patch
@@ -0,0 +1,141 @@
+diff --git a/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/linux-5.4.163/drivers/pwm/pwm-mediatek.c b/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/linux-5.4.163/drivers/pwm/pwm-mediatek.c
+index 7c56ee2..3a5a456 100644
+--- a/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/linux-5.4.163/drivers/pwm/pwm-mediatek.c
++++ b/build_dir/target-aarch64_cortex-a53_musl/linux-mediatek_mt7981/linux-5.4.163/drivers/pwm/pwm-mediatek.c
+@@ -20,7 +20,6 @@
+ #include <linux/slab.h>
+ #include <linux/types.h>
+ 
+-
+ /* PWM registers and bits definitions */
+ #define PWMCON			0x00
+ #define PWMHDUR			0x04
+@@ -33,10 +32,13 @@
+ #define PWM45THRES_FIXUP	0x34
+ 
+ #define PWM_CLK_DIV_MAX		7
++#define REG_V1			1
++#define REG_V2			2
+ 
+ struct pwm_mediatek_of_data {
+ 	unsigned int num_pwms;
+ 	bool pwm45_fixup;
++	int reg_ver;
+ };
+ 
+ /**
+@@ -57,10 +59,14 @@ struct pwm_mediatek_chip {
+ 	const struct pwm_mediatek_of_data *soc;
+ };
+ 
+-static const unsigned int pwm_mediatek_reg_offset[] = {
++static const unsigned int mtk_pwm_reg_offset_v1[] = {
+ 	0x0010, 0x0050, 0x0090, 0x00d0, 0x0110, 0x0150, 0x0190, 0x0220
+ };
+ 
++static const unsigned int mtk_pwm_reg_offset_v2[] = {
++	0x0080, 0x00c0, 0x0100, 0x0140, 0x0180, 0x1c0, 0x200, 0x0240
++};
++
+ static inline struct pwm_mediatek_chip *
+ to_pwm_mediatek_chip(struct pwm_chip *chip)
+ {
+@@ -108,14 +114,38 @@ static void pwm_mediatek_clk_disable(struct pwm_chip *chip,
+ static inline u32 pwm_mediatek_readl(struct pwm_mediatek_chip *chip,
+ 				     unsigned int num, unsigned int offset)
+ {
+-	return readl(chip->regs + pwm_mediatek_reg_offset[num] + offset);
++	u32 pwm_offset;
++
++	switch (chip->soc->reg_ver) {
++	case REG_V2:
++		pwm_offset = mtk_pwm_reg_offset_v2[num];
++		break;
++
++	case REG_V1:
++	default:
++		pwm_offset = mtk_pwm_reg_offset_v1[num];
++	}
++
++	return readl(chip->regs + pwm_offset + offset);
+ }
+ 
+ static inline void pwm_mediatek_writel(struct pwm_mediatek_chip *chip,
+ 				       unsigned int num, unsigned int offset,
+ 				       u32 value)
+ {
+-	writel(value, chip->regs + pwm_mediatek_reg_offset[num] + offset);
++	u32 pwm_offset;
++
++	switch (chip->soc->reg_ver) {
++	case REG_V2:
++		pwm_offset = mtk_pwm_reg_offset_v2[num];
++		break;
++
++	case REG_V1:
++	default:
++		pwm_offset = mtk_pwm_reg_offset_v1[num];
++	}
++
++	writel(value, chip->regs + pwm_offset + offset);
+ }
+ 
+ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
+@@ -281,36 +311,49 @@ static int pwm_mediatek_remove(struct platform_device *pdev)
+ static const struct pwm_mediatek_of_data mt2712_pwm_data = {
+ 	.num_pwms = 8,
+ 	.pwm45_fixup = false,
++	.reg_ver = REG_V1,
+ };
+ 
+ static const struct pwm_mediatek_of_data mt7622_pwm_data = {
+ 	.num_pwms = 6,
+ 	.pwm45_fixup = false,
++	.reg_ver = REG_V1,
+ };
+ 
+ static const struct pwm_mediatek_of_data mt7623_pwm_data = {
+ 	.num_pwms = 5,
+ 	.pwm45_fixup = true,
++	.reg_ver = REG_V1,
+ };
+ 
+ static const struct pwm_mediatek_of_data mt7628_pwm_data = {
+ 	.num_pwms = 4,
+ 	.pwm45_fixup = true,
++	.reg_ver = REG_V1,
+ };
+ 
+ static const struct pwm_mediatek_of_data mt7629_pwm_data = {
+ 	.num_pwms = 1,
+ 	.pwm45_fixup = false,
++	.reg_ver = REG_V1,
++};
++
++static const struct pwm_mediatek_of_data mt7981_pwm_data = {
++	.num_pwms = 3,
++	.pwm45_fixup = false,
++	.reg_ver = REG_V2,
+ };
+ 
+ static const struct pwm_mediatek_of_data mt7986_pwm_data = {
+ 	.num_pwms = 2,
+ 	.pwm45_fixup = false,
++	.reg_ver = REG_V2,
+ };
+ 
+ static const struct pwm_mediatek_of_data mt8516_pwm_data = {
+ 	.num_pwms = 5,
+ 	.pwm45_fixup = false,
++	.reg_ver = REG_V1,
+ };
+ 
+ static const struct of_device_id pwm_mediatek_of_match[] = {
+@@ -319,6 +362,7 @@ static const struct of_device_id pwm_mediatek_of_match[] = {
+ 	{ .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
+ 	{ .compatible = "mediatek,mt7628-pwm", .data = &mt7628_pwm_data },
+ 	{ .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,mt8516-pwm", .data = &mt8516_pwm_data },
+ 	{ },