phy: phy-mtk-tphy: add property for BC12

Some platforms support BC12 which is disabled by default,
here add a property to enable it if need

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 9ab6f2e..3eb8e1b 100644 (file)
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -101,6 +101,9 @@
 #define P2C_RG_AVALID                  BIT(2)
 #define P2C_RG_IDDIG                   BIT(1)
 
+#define U3P_U2PHYBC12C         0x080
+#define P2C_RG_CHGDT_EN                BIT(0)
+
 #define U3P_U3_CHIP_GPIO_CTLD          0x0c
 #define P3C_REG_IP_SW_RST              BIT(31)
 #define P3C_MCU_BUS_CK_GATE_EN         BIT(30)
@@ -297,6 +300,7 @@ struct mtk_phy_instance {
        int eye_src;
        int eye_vrt;
        int eye_term;
+       bool bc12_en;
 };
 
 struct mtk_tphy {
@@ -839,12 +843,16 @@ static void phy_parse_property(struct mtk_tphy *tphy,
        if (instance->type != PHY_TYPE_USB2)
                return;
 
+       instance->bc12_en = device_property_read_bool(dev, "mediatek,bc12");
        device_property_read_u32(dev, "mediatek,eye-src",
                                 &instance->eye_src);
        device_property_read_u32(dev, "mediatek,eye-vrt",
                                 &instance->eye_vrt);
        device_property_read_u32(dev, "mediatek,eye-term",
                                 &instance->eye_term);
+       dev_dbg(dev, "bc12:%d, src:%d, vrt:%d, term:%d\n",
+               instance->bc12_en, instance->eye_src,
+               instance->eye_vrt, instance->eye_term);
 }
 
 static void u2_phy_props_set(struct mtk_tphy *tphy,
@@ -854,6 +862,11 @@ static void u2_phy_props_set(struct mtk_tphy *tphy,
        void __iomem *com = u2_banks->com;
        u32 tmp;
 
+       if (instance->bc12_en) {
+               tmp = readl(com + U3P_U2PHYBC12C);
+               tmp |= P2C_RG_CHGDT_EN; /* BC1.2 path Enable */
+               writel(tmp, com + U3P_U2PHYBC12C);
+       }
 
        if (instance->eye_src) {
                tmp = readl(com + U3P_USBPHYACR5);