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

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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>
This commit is contained in:
Chunfeng Yun 2020-02-11 11:21:12 +08:00 committed by Kishon Vijay Abraham I
parent 8be5a67f71
commit 410572ec08
1 changed files with 14 additions and 2 deletions
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16
drivers/phy/mediatek/phy-mtk-tphy.c
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@ -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;