Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 611 insertions, 0 deletions

diff --git a/drivers/phy/mediatek/phy-mtk-xsphy.c b/drivers/phy/mediatek/phy-mtk-xsphy.c
new file mode 100644
index 000000000..cc1d66954
--- /dev/null
+++ b/drivers/phy/mediatek/phy-mtk-xsphy.c
@@ -0,0 +1,611 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek USB3.1 gen2 xsphy Driver
+ *
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
+ *
+ */
+
+#include <dt-bindings/phy/phy.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "phy-mtk-io.h"
+
+/* u2 phy banks */
+#define SSUSB_SIFSLV_MISC		0x000
+#define SSUSB_SIFSLV_U2FREQ		0x100
+#define SSUSB_SIFSLV_U2PHY_COM	0x300
+
+/* u3 phy shared banks */
+#define SSPXTP_SIFSLV_DIG_GLB		0x000
+#define SSPXTP_SIFSLV_PHYA_GLB		0x100
+
+/* u3 phy banks */
+#define SSPXTP_SIFSLV_DIG_LN_TOP	0x000
+#define SSPXTP_SIFSLV_DIG_LN_TX0	0x100
+#define SSPXTP_SIFSLV_DIG_LN_RX0	0x200
+#define SSPXTP_SIFSLV_DIG_LN_DAIF	0x300
+#define SSPXTP_SIFSLV_PHYA_LN		0x400
+
+#define XSP_U2FREQ_FMCR0	((SSUSB_SIFSLV_U2FREQ) + 0x00)
+#define P2F_RG_FREQDET_EN	BIT(24)
+#define P2F_RG_CYCLECNT		GENMASK(23, 0)
+
+#define XSP_U2FREQ_MMONR0  ((SSUSB_SIFSLV_U2FREQ) + 0x0c)
+
+#define XSP_U2FREQ_FMMONR1	((SSUSB_SIFSLV_U2FREQ) + 0x10)
+#define P2F_RG_FRCK_EN		BIT(8)
+#define P2F_USB_FM_VALID	BIT(0)
+
+#define XSP_USBPHYACR0	((SSUSB_SIFSLV_U2PHY_COM) + 0x00)
+#define P2A0_RG_INTR_EN	BIT(5)
+
+#define XSP_USBPHYACR1		((SSUSB_SIFSLV_U2PHY_COM) + 0x04)
+#define P2A1_RG_INTR_CAL		GENMASK(23, 19)
+#define P2A1_RG_VRT_SEL			GENMASK(14, 12)
+#define P2A1_RG_TERM_SEL		GENMASK(10, 8)
+
+#define XSP_USBPHYACR5		((SSUSB_SIFSLV_U2PHY_COM) + 0x014)
+#define P2A5_RG_HSTX_SRCAL_EN	BIT(15)
+#define P2A5_RG_HSTX_SRCTRL		GENMASK(14, 12)
+
+#define XSP_USBPHYACR6		((SSUSB_SIFSLV_U2PHY_COM) + 0x018)
+#define P2A6_RG_BC11_SW_EN	BIT(23)
+#define P2A6_RG_OTG_VBUSCMP_EN	BIT(20)
+
+#define XSP_U2PHYDTM1		((SSUSB_SIFSLV_U2PHY_COM) + 0x06C)
+#define P2D_FORCE_IDDIG		BIT(9)
+#define P2D_RG_VBUSVALID	BIT(5)
+#define P2D_RG_SESSEND		BIT(4)
+#define P2D_RG_AVALID		BIT(2)
+#define P2D_RG_IDDIG		BIT(1)
+
+#define SSPXTP_PHYA_GLB_00		((SSPXTP_SIFSLV_PHYA_GLB) + 0x00)
+#define RG_XTP_GLB_BIAS_INTR_CTRL		GENMASK(21, 16)
+
+#define SSPXTP_PHYA_LN_04	((SSPXTP_SIFSLV_PHYA_LN) + 0x04)
+#define RG_XTP_LN0_TX_IMPSEL		GENMASK(4, 0)
+
+#define SSPXTP_PHYA_LN_14	((SSPXTP_SIFSLV_PHYA_LN) + 0x014)
+#define RG_XTP_LN0_RX_IMPSEL		GENMASK(4, 0)
+
+#define XSP_REF_CLK		26	/* MHZ */
+#define XSP_SLEW_RATE_COEF	17
+#define XSP_SR_COEF_DIVISOR	1000
+#define XSP_FM_DET_CYCLE_CNT	1024
+
+/* PHY switch between pcie/usb3/sgmii */
+#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
+
+struct xsphy_instance {
+	struct phy *phy;
+	void __iomem *port_base;
+	struct clk *ref_clk;	/* reference clock of anolog phy */
+	u32 index;
+	u32 type;
+	struct regmap *type_sw;
+	u32 type_sw_reg;
+	u32 type_sw_index;
+	/* only for HQA test */
+	int efuse_intr;
+	int efuse_tx_imp;
+	int efuse_rx_imp;
+	/* u2 eye diagram */
+	int eye_src;
+	int eye_vrt;
+	int eye_term;
+};
+
+struct mtk_xsphy {
+	struct device *dev;
+	void __iomem *glb_base;	/* only shared u3 sif */
+	int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
+	int src_coef;    /* coefficient for slew rate calibrate */
+	int nphys;
+	struct xsphy_instance *phys[] __counted_by(nphys);
+};
+
+static void u2_phy_slew_rate_calibrate(struct mtk_xsphy *xsphy,
+					struct xsphy_instance *inst)
+{
+	void __iomem *pbase = inst->port_base;
+	int calib_val;
+	int fm_out;
+	u32 tmp;
+
+	/* use force value */
+	if (inst->eye_src)
+		return;
+
+	/* enable USB ring oscillator */
+	mtk_phy_set_bits(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCAL_EN);
+	udelay(1);	/* wait clock stable */
+
+	/* enable free run clock */
+	mtk_phy_set_bits(pbase + XSP_U2FREQ_FMMONR1, P2F_RG_FRCK_EN);
+
+	/* set cycle count as 1024 */
+	mtk_phy_update_field(pbase + XSP_U2FREQ_FMCR0, P2F_RG_CYCLECNT,
+			     XSP_FM_DET_CYCLE_CNT);
+
+	/* enable frequency meter */
+	mtk_phy_set_bits(pbase + XSP_U2FREQ_FMCR0, P2F_RG_FREQDET_EN);
+
+	/* ignore return value */
+	readl_poll_timeout(pbase + XSP_U2FREQ_FMMONR1, tmp,
+			   (tmp & P2F_USB_FM_VALID), 10, 200);
+
+	fm_out = readl(pbase + XSP_U2FREQ_MMONR0);
+
+	/* disable frequency meter */
+	mtk_phy_clear_bits(pbase + XSP_U2FREQ_FMCR0, P2F_RG_FREQDET_EN);
+
+	/* disable free run clock */
+	mtk_phy_clear_bits(pbase + XSP_U2FREQ_FMMONR1, P2F_RG_FRCK_EN);
+
+	if (fm_out) {
+		/* (1024 / FM_OUT) x reference clock frequency x coefficient */
+		tmp = xsphy->src_ref_clk * xsphy->src_coef;
+		tmp = (tmp * XSP_FM_DET_CYCLE_CNT) / fm_out;
+		calib_val = DIV_ROUND_CLOSEST(tmp, XSP_SR_COEF_DIVISOR);
+	} else {
+		/* if FM detection fail, set default value */
+		calib_val = 3;
+	}
+	dev_dbg(xsphy->dev, "phy.%d, fm_out:%d, calib:%d (clk:%d, coef:%d)\n",
+		inst->index, fm_out, calib_val,
+		xsphy->src_ref_clk, xsphy->src_coef);
+
+	/* set HS slew rate */
+	mtk_phy_update_field(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCTRL, calib_val);
+
+	/* disable USB ring oscillator */
+	mtk_phy_clear_bits(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCAL_EN);
+}
+
+static void u2_phy_instance_init(struct mtk_xsphy *xsphy,
+				 struct xsphy_instance *inst)
+{
+	void __iomem *pbase = inst->port_base;
+
+	/* DP/DM BC1.1 path Disable */
+	mtk_phy_clear_bits(pbase + XSP_USBPHYACR6, P2A6_RG_BC11_SW_EN);
+
+	mtk_phy_set_bits(pbase + XSP_USBPHYACR0, P2A0_RG_INTR_EN);
+}
+
+static void u2_phy_instance_power_on(struct mtk_xsphy *xsphy,
+				     struct xsphy_instance *inst)
+{
+	void __iomem *pbase = inst->port_base;
+	u32 index = inst->index;
+
+	mtk_phy_set_bits(pbase + XSP_USBPHYACR6, P2A6_RG_OTG_VBUSCMP_EN);
+
+	mtk_phy_update_bits(pbase + XSP_U2PHYDTM1,
+			    P2D_RG_VBUSVALID | P2D_RG_AVALID | P2D_RG_SESSEND,
+			    P2D_RG_VBUSVALID | P2D_RG_AVALID);
+
+	dev_dbg(xsphy->dev, "%s(%d)\n", __func__, index);
+}
+
+static void u2_phy_instance_power_off(struct mtk_xsphy *xsphy,
+				      struct xsphy_instance *inst)
+{
+	void __iomem *pbase = inst->port_base;
+	u32 index = inst->index;
+
+	mtk_phy_clear_bits(pbase + XSP_USBPHYACR6, P2A6_RG_OTG_VBUSCMP_EN);
+
+	mtk_phy_update_bits(pbase + XSP_U2PHYDTM1,
+			    P2D_RG_VBUSVALID | P2D_RG_AVALID | P2D_RG_SESSEND,
+			    P2D_RG_SESSEND);
+
+	dev_dbg(xsphy->dev, "%s(%d)\n", __func__, index);
+}
+
+static void u2_phy_instance_set_mode(struct mtk_xsphy *xsphy,
+				     struct xsphy_instance *inst,
+				     enum phy_mode mode)
+{
+	u32 tmp;
+
+	tmp = readl(inst->port_base + XSP_U2PHYDTM1);
+	switch (mode) {
+	case PHY_MODE_USB_DEVICE:
+		tmp |= P2D_FORCE_IDDIG | P2D_RG_IDDIG;
+		break;
+	case PHY_MODE_USB_HOST:
+		tmp |= P2D_FORCE_IDDIG;
+		tmp &= ~P2D_RG_IDDIG;
+		break;
+	case PHY_MODE_USB_OTG:
+		tmp &= ~(P2D_FORCE_IDDIG | P2D_RG_IDDIG);
+		break;
+	default:
+		return;
+	}
+	writel(tmp, inst->port_base + XSP_U2PHYDTM1);
+}
+
+static void phy_parse_property(struct mtk_xsphy *xsphy,
+				struct xsphy_instance *inst)
+{
+	struct device *dev = &inst->phy->dev;
+
+	switch (inst->type) {
+	case PHY_TYPE_USB2:
+		device_property_read_u32(dev, "mediatek,efuse-intr",
+					 &inst->efuse_intr);
+		device_property_read_u32(dev, "mediatek,eye-src",
+					 &inst->eye_src);
+		device_property_read_u32(dev, "mediatek,eye-vrt",
+					 &inst->eye_vrt);
+		device_property_read_u32(dev, "mediatek,eye-term",
+					 &inst->eye_term);
+		dev_dbg(dev, "intr:%d, src:%d, vrt:%d, term:%d\n",
+			inst->efuse_intr, inst->eye_src,
+			inst->eye_vrt, inst->eye_term);
+		break;
+	case PHY_TYPE_USB3:
+		device_property_read_u32(dev, "mediatek,efuse-intr",
+					 &inst->efuse_intr);
+		device_property_read_u32(dev, "mediatek,efuse-tx-imp",
+					 &inst->efuse_tx_imp);
+		device_property_read_u32(dev, "mediatek,efuse-rx-imp",
+					 &inst->efuse_rx_imp);
+		dev_dbg(dev, "intr:%d, tx-imp:%d, rx-imp:%d\n",
+			inst->efuse_intr, inst->efuse_tx_imp,
+			inst->efuse_rx_imp);
+		break;
+	case PHY_TYPE_PCIE:
+	case PHY_TYPE_SGMII:
+		/* nothing to do */
+		break;
+	default:
+		dev_err(xsphy->dev, "incompatible phy type\n");
+		return;
+	}
+}
+
+static void u2_phy_props_set(struct mtk_xsphy *xsphy,
+			     struct xsphy_instance *inst)
+{
+	void __iomem *pbase = inst->port_base;
+
+	if (inst->efuse_intr)
+		mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_INTR_CAL,
+				     inst->efuse_intr);
+
+	if (inst->eye_src)
+		mtk_phy_update_field(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCTRL,
+				     inst->eye_src);
+
+	if (inst->eye_vrt)
+		mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_VRT_SEL,
+				     inst->eye_vrt);
+
+	if (inst->eye_term)
+		mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_TERM_SEL,
+				     inst->eye_term);
+}
+
+static void u3_phy_props_set(struct mtk_xsphy *xsphy,
+			     struct xsphy_instance *inst)
+{
+	void __iomem *pbase = inst->port_base;
+
+	if (inst->efuse_intr)
+		mtk_phy_update_field(xsphy->glb_base + SSPXTP_PHYA_GLB_00,
+				     RG_XTP_GLB_BIAS_INTR_CTRL, inst->efuse_intr);
+
+	if (inst->efuse_tx_imp)
+		mtk_phy_update_field(pbase + SSPXTP_PHYA_LN_04,
+				     RG_XTP_LN0_TX_IMPSEL, inst->efuse_tx_imp);
+
+	if (inst->efuse_rx_imp)
+		mtk_phy_update_field(pbase + SSPXTP_PHYA_LN_14,
+				     RG_XTP_LN0_RX_IMPSEL, inst->efuse_rx_imp);
+}
+
+/* type switch for usb3/pcie/sgmii */
+static int phy_type_syscon_get(struct xsphy_instance *instance,
+			       struct device_node *dn)
+{
+	struct of_phandle_args args;
+	int ret;
+
+	/* type switch function is optional */
+	if (!of_property_present(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 xsphy_instance *instance)
+{
+	int type;
+	u32 offset;
+
+	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_USB2:
+	default:
+		return 0;
+	}
+
+	offset = instance->type_sw_index * BITS_PER_BYTE;
+	regmap_update_bits(instance->type_sw, instance->type_sw_reg,
+			   RG_PHY_SW_TYPE << offset, type << offset);
+
+	return 0;
+}
+
+static int mtk_phy_init(struct phy *phy)
+{
+	struct xsphy_instance *inst = phy_get_drvdata(phy);
+	struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+	int ret;
+
+	ret = clk_prepare_enable(inst->ref_clk);
+	if (ret) {
+		dev_err(xsphy->dev, "failed to enable ref_clk\n");
+		return ret;
+	}
+
+	switch (inst->type) {
+	case PHY_TYPE_USB2:
+		u2_phy_instance_init(xsphy, inst);
+		u2_phy_props_set(xsphy, inst);
+		break;
+	case PHY_TYPE_USB3:
+		u3_phy_props_set(xsphy, inst);
+		break;
+	case PHY_TYPE_PCIE:
+	case PHY_TYPE_SGMII:
+		/* nothing to do, only used to set type */
+		break;
+	default:
+		dev_err(xsphy->dev, "incompatible phy type\n");
+		clk_disable_unprepare(inst->ref_clk);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int mtk_phy_power_on(struct phy *phy)
+{
+	struct xsphy_instance *inst = phy_get_drvdata(phy);
+	struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+
+	if (inst->type == PHY_TYPE_USB2) {
+		u2_phy_instance_power_on(xsphy, inst);
+		u2_phy_slew_rate_calibrate(xsphy, inst);
+	}
+
+	return 0;
+}
+
+static int mtk_phy_power_off(struct phy *phy)
+{
+	struct xsphy_instance *inst = phy_get_drvdata(phy);
+	struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+
+	if (inst->type == PHY_TYPE_USB2)
+		u2_phy_instance_power_off(xsphy, inst);
+
+	return 0;
+}
+
+static int mtk_phy_exit(struct phy *phy)
+{
+	struct xsphy_instance *inst = phy_get_drvdata(phy);
+
+	clk_disable_unprepare(inst->ref_clk);
+	return 0;
+}
+
+static int mtk_phy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
+{
+	struct xsphy_instance *inst = phy_get_drvdata(phy);
+	struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
+
+	if (inst->type == PHY_TYPE_USB2)
+		u2_phy_instance_set_mode(xsphy, inst, mode);
+
+	return 0;
+}
+
+static struct phy *mtk_phy_xlate(struct device *dev,
+				 const struct of_phandle_args *args)
+{
+	struct mtk_xsphy *xsphy = dev_get_drvdata(dev);
+	struct xsphy_instance *inst = NULL;
+	struct device_node *phy_np = args->np;
+	int index;
+
+	if (args->args_count != 1) {
+		dev_err(dev, "invalid number of cells in 'phy' property\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	for (index = 0; index < xsphy->nphys; index++)
+		if (phy_np == xsphy->phys[index]->phy->dev.of_node) {
+			inst = xsphy->phys[index];
+			break;
+		}
+
+	if (!inst) {
+		dev_err(dev, "failed to find appropriate phy\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	inst->type = args->args[0];
+	if (!(inst->type == PHY_TYPE_USB2 ||
+	      inst->type == PHY_TYPE_USB3 ||
+	      inst->type == PHY_TYPE_PCIE ||
+	      inst->type == PHY_TYPE_SGMII)) {
+		dev_err(dev, "unsupported phy type: %d\n", inst->type);
+		return ERR_PTR(-EINVAL);
+	}
+
+	phy_parse_property(xsphy, inst);
+	phy_type_set(inst);
+
+	return inst->phy;
+}
+
+static const struct phy_ops mtk_xsphy_ops = {
+	.init		= mtk_phy_init,
+	.exit		= mtk_phy_exit,
+	.power_on	= mtk_phy_power_on,
+	.power_off	= mtk_phy_power_off,
+	.set_mode	= mtk_phy_set_mode,
+	.owner		= THIS_MODULE,
+};
+
+static const struct of_device_id mtk_xsphy_id_table[] = {
+	{ .compatible = "mediatek,xsphy", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, mtk_xsphy_id_table);
+
+static int mtk_xsphy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct phy_provider *provider;
+	struct resource *glb_res;
+	struct mtk_xsphy *xsphy;
+	struct resource res;
+	size_t nphys;
+	int port;
+
+	nphys = of_get_child_count(np);
+	xsphy = devm_kzalloc(dev, struct_size(xsphy, phys, nphys), GFP_KERNEL);
+	if (!xsphy)
+		return -ENOMEM;
+
+	xsphy->nphys = nphys;
+	xsphy->dev = dev;
+	platform_set_drvdata(pdev, xsphy);
+
+	glb_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	/* optional, may not exist if no u3 phys */
+	if (glb_res) {
+		/* get banks shared by multiple u3 phys */
+		xsphy->glb_base = devm_ioremap_resource(dev, glb_res);
+		if (IS_ERR(xsphy->glb_base)) {
+			dev_err(dev, "failed to remap glb regs\n");
+			return PTR_ERR(xsphy->glb_base);
+		}
+	}
+
+	xsphy->src_ref_clk = XSP_REF_CLK;
+	xsphy->src_coef = XSP_SLEW_RATE_COEF;
+	/* update parameters of slew rate calibrate if exist */
+	device_property_read_u32(dev, "mediatek,src-ref-clk-mhz",
+				 &xsphy->src_ref_clk);
+	device_property_read_u32(dev, "mediatek,src-coef", &xsphy->src_coef);
+
+	port = 0;
+	for_each_child_of_node_scoped(np, child_np) {
+		struct xsphy_instance *inst;
+		struct phy *phy;
+		int retval;
+
+		inst = devm_kzalloc(dev, sizeof(*inst), GFP_KERNEL);
+		if (!inst)
+			return -ENOMEM;
+
+		xsphy->phys[port] = inst;
+
+		phy = devm_phy_create(dev, child_np, &mtk_xsphy_ops);
+		if (IS_ERR(phy)) {
+			dev_err(dev, "failed to create phy\n");
+			return PTR_ERR(phy);
+		}
+
+		retval = of_address_to_resource(child_np, 0, &res);
+		if (retval) {
+			dev_err(dev, "failed to get address resource(id-%d)\n",
+				port);
+			return retval;
+		}
+
+		inst->port_base = devm_ioremap_resource(&phy->dev, &res);
+		if (IS_ERR(inst->port_base)) {
+			dev_err(dev, "failed to remap phy regs\n");
+			return PTR_ERR(inst->port_base);
+		}
+
+		inst->phy = phy;
+		inst->index = port;
+		phy_set_drvdata(phy, inst);
+		port++;
+
+		inst->ref_clk = devm_clk_get(&phy->dev, "ref");
+		if (IS_ERR(inst->ref_clk)) {
+			dev_err(dev, "failed to get ref_clk(id-%d)\n", port);
+			return PTR_ERR(inst->ref_clk);
+		}
+
+		retval = phy_type_syscon_get(inst, child_np);
+		if (retval)
+			return retval;
+	}
+
+	provider = devm_of_phy_provider_register(dev, mtk_phy_xlate);
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+static struct platform_driver mtk_xsphy_driver = {
+	.probe		= mtk_xsphy_probe,
+	.driver		= {
+		.name	= "mtk-xsphy",
+		.of_match_table = mtk_xsphy_id_table,
+	},
+};
+
+module_platform_driver(mtk_xsphy_driver);
+
+MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek USB XS-PHY driver");
+MODULE_LICENSE("GPL v2");