pwm: pwm-mediatek: Add support for PWM IP V3.0.2 in MT6991/MT8196

Add support for the PWM IP version 3.0.2, found in MediaTek's
Dimensity 9400 MT6991 and in the MT8196 Chromebook SoC: this
needs a new register offset array and also a different offset
for the PWM_CK_26M_SEL register.

Signed-off-by: AngeloGioacchino Del Regno <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: AngeloGioacchino Del Regno

drivers/pwm/pwm-mediatek.c

@@ -29,6 +29,7 @@
 #define PWM45DWIDTH_FIXUP	0x30
 #define PWMTHRES		0x30
 #define PWM45THRES_FIXUP	0x34
+#define PWM_CK_26M_SEL_V3	0x74
 #define PWM_CK_26M_SEL		0x210
 
 #define PWM_CLK_DIV_MAX		7
@@ -64,6 +65,11 @@ static const unsigned int mtk_pwm_reg_offset_v2[] = {
 	0x0080, 0x00c0, 0x0100, 0x0140, 0x0180, 0x01c0, 0x0200, 0x0240
 };
 
+/* PWM IP Version 3.0.2 */
+static const unsigned int mtk_pwm_reg_offset_v3[] = {
+	0x0100, 0x0200, 0x0300, 0x0400, 0x0500, 0x0600, 0x0700, 0x0800
+};
+
 static inline struct pwm_mediatek_chip *
 to_pwm_mediatek_chip(struct pwm_chip *chip)
 {
@@ -369,9 +375,17 @@ static const struct pwm_mediatek_of_data mt8516_pwm_data = {
 	.reg_offset = mtk_pwm_reg_offset_v1,
 };
 
+static const struct pwm_mediatek_of_data mt6991_pwm_data = {
+	.num_pwms = 4,
+	.pwm45_fixup = false,
+	.pwm_ck_26m_sel_reg = PWM_CK_26M_SEL_V3,
+	.reg_offset = mtk_pwm_reg_offset_v3,
+};
+
 static const struct of_device_id pwm_mediatek_of_match[] = {
 	{ .compatible = "mediatek,mt2712-pwm", .data = &mt2712_pwm_data },
 	{ .compatible = "mediatek,mt6795-pwm", .data = &mt6795_pwm_data },
+	{ .compatible = "mediatek,mt6991-pwm", .data = &mt6991_pwm_data },
 	{ .compatible = "mediatek,mt7622-pwm", .data = &mt7622_pwm_data },
 	{ .compatible = "mediatek,mt7623-pwm", .data = &mt7623_pwm_data },
 	{ .compatible = "mediatek,mt7628-pwm", .data = &mt7628_pwm_data },