From ddeda571f3d79dcccef6541b6413cb184de40afd Mon Sep 17 00:00:00 2001
From: Zhanyong Wang <zhanyong.wang@mediatek.com>
Date: Fri, 17 Sep 2021 15:56:53 +0800
Subject: [PATCH] phy: phy-mtk-tphy: support type switch by pericfg

Add support type switch between USB3, PCIe, SATA and SGMII by
pericfg register, this is used to take the place of efuse or
jumper.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Zhanyong Wang <zhanyong.wang@mediatek.com>
---
 drivers/phy/mediatek/phy-mtk-tphy.c | 84 +++++++++++++++++++++++++++--
 1 file changed, 81 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
index d1ecf088032b..759e1c0c370a 100644
--- a/drivers/phy/mediatek/phy-mtk-tphy.c
+++ b/drivers/phy/mediatek/phy-mtk-tphy.c
@@ -10,12 +10,12 @@
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
-#include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 
 /* version V1 sub-banks offset base address */
@@ -268,6 +268,14 @@
 #define HIF_SYSCFG1			0x14
 #define HIF_SYSCFG1_PHY2_MASK		(0x3 << 20)
 
+/* PHY switch between pcie/usb3/sgmii/sata */
+#define USB_PHY_SWITCH_CTRL	0x0
+#define RG_PHY_SW_TYPE		GENMASK(3, 0)
+#define RG_PHY_SW_PCIE		0x0
+#define RG_PHY_SW_USB3		0x1
+#define RG_PHY_SW_SGMII		0x2
+#define RG_PHY_SW_SATA		0x3
+
 enum mtk_phy_version {
 	MTK_PHY_V1 = 1,
 	MTK_PHY_V2,
@@ -301,7 +309,10 @@ struct mtk_phy_instance {
 	};
 	struct clk *ref_clk;	/* reference clock of anolog phy */
 	u32 index;
-	u8 type;
+	u32 type;
+	struct regmap *type_sw;
+	u32 type_sw_reg;
+	u32 type_sw_index;
 	int eye_src;
 	int eye_vrt;
 	int eye_term;
@@ -900,6 +911,64 @@ static void u2_phy_props_set(struct mtk_tphy *tphy,
 	}
 }
 
+/* type switch for usb3/pcie/sgmii/sata */
+static int phy_type_syscon_get(struct mtk_phy_instance *instance,
+			       struct device_node *dn)
+{
+	struct of_phandle_args args;
+	int ret;
+
+	/* type switch function is optional */
+	if (!of_property_read_bool(dn, "mediatek,syscon-type"))
+		return 0;
+
+	ret = of_parse_phandle_with_fixed_args(dn, "mediatek,syscon-type",
+					       2, 0, &args);
+	if (ret)
+		return ret;
+
+	instance->type_sw_reg = args.args[0];
+	instance->type_sw_index = args.args[1] & 0x3; /* <=3 */
+	instance->type_sw = syscon_node_to_regmap(args.np);
+	of_node_put(args.np);
+	dev_info(&instance->phy->dev, "type_sw - reg %#x, index %d\n",
+		 instance->type_sw_reg, instance->type_sw_index);
+
+	return PTR_ERR_OR_ZERO(instance->type_sw);
+}
+
+static int phy_type_set(struct mtk_phy_instance *instance)
+{
+	int type;
+	u32 mask;
+
+	if (!instance->type_sw)
+		return 0;
+
+	switch (instance->type) {
+	case PHY_TYPE_USB3:
+		type = RG_PHY_SW_USB3;
+		break;
+	case PHY_TYPE_PCIE:
+		type = RG_PHY_SW_PCIE;
+		break;
+	case PHY_TYPE_SGMII:
+		type = RG_PHY_SW_SGMII;
+		break;
+	case PHY_TYPE_SATA:
+		type = RG_PHY_SW_SATA;
+		break;
+	case PHY_TYPE_USB2:
+	default:
+		return 0;
+	}
+
+	mask = RG_PHY_SW_TYPE << (instance->type_sw_index * BITS_PER_BYTE);
+	regmap_update_bits(instance->type_sw, instance->type_sw_reg, mask, type);
+
+	return 0;
+}
+
 static int mtk_phy_init(struct phy *phy)
 {
 	struct mtk_phy_instance *instance = phy_get_drvdata(phy);
@@ -932,6 +1001,9 @@ static int mtk_phy_init(struct phy *phy)
 	case PHY_TYPE_SATA:
 		sata_phy_instance_init(tphy, instance);
 		break;
+	case PHY_TYPE_SGMII:
+		/* nothing to do, only used to set type */
+		break;
 	default:
 		dev_err(tphy->dev, "incompatible PHY type\n");
 		return -EINVAL;
@@ -1020,7 +1092,8 @@ static struct phy *mtk_phy_xlate(struct device *dev,
 	if (!(instance->type == PHY_TYPE_USB2 ||
 	      instance->type == PHY_TYPE_USB3 ||
 	      instance->type == PHY_TYPE_PCIE ||
-	      instance->type == PHY_TYPE_SATA)) {
+	      instance->type == PHY_TYPE_SATA ||
+	      instance->type == PHY_TYPE_SGMII)) {
 		dev_err(dev, "unsupported device type: %d\n", instance->type);
 		return ERR_PTR(-EINVAL);
 	}
@@ -1035,6 +1108,7 @@ static struct phy *mtk_phy_xlate(struct device *dev,
 	}
 
 	phy_parse_property(tphy, instance);
+	phy_type_set(instance);
 
 	return instance->phy;
 }
@@ -1183,6 +1257,10 @@ static int mtk_tphy_probe(struct platform_device *pdev)
 			retval = PTR_ERR(instance->ref_clk);
 			goto put_child;
 		}
+
+		retval = phy_type_syscon_get(instance, child_np);
+		if (retval)
+			goto put_child;
 	}
 
 	provider = devm_of_phy_provider_register(dev, mtk_phy_xlate);
-- 
2.18.0