phy: phy-mtk-tphy: add a property for internal resistance

This is used to tune J-K voltage by internal R (resistance), the
range is [0, 31], the resistance value is about 6.9K ohm for 0,
3.8K ohm for 31, and the step is 1K ohm

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index 5afe336..4a2dc92 100644 (file)
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -43,6 +43,8 @@
 #define PA0_RG_USB20_INTR_EN           BIT(5)
 
 #define U3P_USBPHYACR1         0x004
+#define PA1_RG_INTR_CAL                GENMASK(23, 19)
+#define PA1_RG_INTR_CAL_VAL(x) ((0x1f & (x)) << 19)
 #define PA1_RG_VRT_SEL                 GENMASK(14, 12)
 #define PA1_RG_VRT_SEL_VAL(x)  ((0x7 & (x)) << 12)
 #define PA1_RG_TERM_SEL                GENMASK(10, 8)
@@ -302,6 +304,7 @@ struct mtk_phy_instance {
        int eye_src;
        int eye_vrt;
        int eye_term;
+       int intr;
        int discth;
        bool bc12_en;
 };
@@ -853,12 +856,14 @@ static void phy_parse_property(struct mtk_tphy *tphy,
                                 &instance->eye_vrt);
        device_property_read_u32(dev, "mediatek,eye-term",
                                 &instance->eye_term);
+       device_property_read_u32(dev, "mediatek,intr",
+                                &instance->intr);
        device_property_read_u32(dev, "mediatek,discth",
                                 &instance->discth);
-       dev_dbg(dev, "bc12:%d, src:%d, vrt:%d, term:%d, disc:%d\n",
+       dev_dbg(dev, "bc12:%d, src:%d, vrt:%d, term:%d, intr:%d, disc:%d\n",
                instance->bc12_en, instance->eye_src,
                instance->eye_vrt, instance->eye_term,
-               instance->discth);
+               instance->intr, instance->discth);
 }
 
 static void u2_phy_props_set(struct mtk_tphy *tphy,
@@ -895,6 +900,13 @@ static void u2_phy_props_set(struct mtk_tphy *tphy,
                writel(tmp, com + U3P_USBPHYACR1);
        }
 
+       if (instance->intr) {
+               tmp = readl(com + U3P_USBPHYACR1);
+               tmp &= ~PA1_RG_INTR_CAL;
+               tmp |= PA1_RG_INTR_CAL_VAL(instance->intr);
+               writel(tmp, com + U3P_USBPHYACR1);
+       }
+
        if (instance->discth) {
                tmp = readl(com + U3P_USBPHYACR6);
                tmp &= ~PA6_RG_U2_DISCTH;