linux-kernel - [PATCH v4 07/11] phy: phy-mtk-tphy: add a property for internal resistance

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Message-ID: <1573547796-29566-7-git-send-email-chunfeng.yun@mediatek.com>
Date:   Tue, 12 Nov 2019 16:36:32 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v4 07/11] 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@...iatek.com>
---
v4: change commit log

v3: change commit log

v2: no changes
---
 drivers/phy/mediatek/phy-mtk-tphy.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index 5afe33621dbc..4a2dc92f10f5 100644
--- 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;
-- 
2.23.0