linux-kernel - [PATCH v4 2/3] phy: phy-mtk-tphy: support new hardware version

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Date:   Fri, 23 Jul 2021 16:22:41 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Vinod Koul <vkoul@...nel.org>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: [PATCH v4 2/3] phy: phy-mtk-tphy: support new hardware version

The PHYA arch is updated, and doesn't support slew rate calibrate
anymore on 7nm or advanced process, add a new version number to
support it.
Note: the FreqMeter bank is not used but reserved.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2~4: no changes
---
 drivers/phy/mediatek/phy-mtk-tphy.c | 40 +++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index 731c483a04de..42a1174da6cc 100644
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -27,7 +27,8 @@
 #define SSUSB_SIFSLV_V1_U3PHYD		0x000
 #define SSUSB_SIFSLV_V1_U3PHYA		0x200
 
-/* version V2 sub-banks offset base address */
+/* version V2/V3 sub-banks offset base address */
+/* V3: U2FREQ is not used anymore, but reserved */
 /* u2 phy banks */
 #define SSUSB_SIFSLV_V2_MISC		0x000
 #define SSUSB_SIFSLV_V2_U2FREQ		0x100
@@ -270,6 +271,7 @@
 enum mtk_phy_version {
 	MTK_PHY_V1 = 1,
 	MTK_PHY_V2,
+	MTK_PHY_V3,
 };
 
 struct mtk_phy_pdata {
@@ -330,6 +332,10 @@ static void hs_slew_rate_calibrate(struct mtk_tphy *tphy,
 	int fm_out;
 	u32 tmp;
 
+	/* HW V3 doesn't support slew rate cal anymore */
+	if (tphy->pdata->version == MTK_PHY_V3)
+		return;
+
 	/* use force value */
 	if (instance->eye_src)
 		return;
@@ -878,7 +884,7 @@ static void u2_phy_props_set(struct mtk_tphy *tphy,
 		writel(tmp, com + U3P_U2PHYBC12C);
 	}
 
-	if (instance->eye_src) {
+	if (tphy->pdata->version < MTK_PHY_V3 && instance->eye_src) {
 		tmp = readl(com + U3P_USBPHYACR5);
 		tmp &= ~PA5_RG_U2_HSTX_SRCTRL;
 		tmp |= PA5_RG_U2_HSTX_SRCTRL_VAL(instance->eye_src);
@@ -1042,11 +1048,15 @@ static struct phy *mtk_phy_xlate(struct device *dev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (tphy->pdata->version == MTK_PHY_V1) {
+	switch (tphy->pdata->version) {
+	case MTK_PHY_V1:
 		phy_v1_banks_init(tphy, instance);
-	} else if (tphy->pdata->version == MTK_PHY_V2) {
+		break;
+	case MTK_PHY_V2:
+	case MTK_PHY_V3:
 		phy_v2_banks_init(tphy, instance);
-	} else {
+		break;
+	default:
 		dev_err(dev, "phy version is not supported\n");
 		return ERR_PTR(-EINVAL);
 	}
@@ -1075,6 +1085,10 @@ static const struct mtk_phy_pdata tphy_v2_pdata = {
 	.version = MTK_PHY_V2,
 };
 
+static const struct mtk_phy_pdata tphy_v3_pdata = {
+	.version = MTK_PHY_V3,
+};
+
 static const struct mtk_phy_pdata mt8173_pdata = {
 	.avoid_rx_sen_degradation = true,
 	.version = MTK_PHY_V1,
@@ -1086,6 +1100,7 @@ static const struct of_device_id mtk_tphy_id_table[] = {
 	{ .compatible = "mediatek,mt8173-u3phy", .data = &mt8173_pdata },
 	{ .compatible = "mediatek,generic-tphy-v1", .data = &tphy_v1_pdata },
 	{ .compatible = "mediatek,generic-tphy-v2", .data = &tphy_v2_pdata },
+	{ .compatible = "mediatek,generic-tphy-v3", .data = &tphy_v3_pdata },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, mtk_tphy_id_table);
@@ -1129,12 +1144,15 @@ static int mtk_tphy_probe(struct platform_device *pdev)
 		}
 	}
 
-	tphy->src_ref_clk = U3P_REF_CLK;
-	tphy->src_coef = U3P_SLEW_RATE_COEF;
-	/* update parameters of slew rate calibrate if exist */
-	device_property_read_u32(dev, "mediatek,src-ref-clk-mhz",
-		&tphy->src_ref_clk);
-	device_property_read_u32(dev, "mediatek,src-coef", &tphy->src_coef);
+	if (tphy->pdata->version < MTK_PHY_V3) {
+		tphy->src_ref_clk = U3P_REF_CLK;
+		tphy->src_coef = U3P_SLEW_RATE_COEF;
+		/* update parameters of slew rate calibrate if exist */
+		device_property_read_u32(dev, "mediatek,src-ref-clk-mhz",
+					 &tphy->src_ref_clk);
+		device_property_read_u32(dev, "mediatek,src-coef",
+					 &tphy->src_coef);
+	}
 
 	port = 0;
 	for_each_child_of_node(np, child_np) {
-- 
2.18.0