Message-ID: <20241112-qps615_pwr-v3-6-29a1e98aa2b0@quicinc.com>
Date: Tue, 12 Nov 2024 20:31:38 +0530
From: Krishna chaitanya chundru <quic_krichai@...cinc.com>
To: <andersson@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo
 Pieralisi" <lpieralisi@...nel.org>,
        Krzysztof Wilczyński
	<kw@...ux.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        "Rob Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor Dooley" <conor+dt@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        <cros-qcom-dts-watchers@...omium.org>,
        Jingoo Han <jingoohan1@...il.com>, Bartosz Golaszewski <brgl@...ev.pl>
CC: <quic_vbadigan@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Krishna chaitanya chundru
	<quic_krichai@...cinc.com>
Subject: [PATCH v3 6/6] PCI: pwrctl: Add power control driver for qps615

QPS615 is the PCIe switch which has one upstream and three downstream
ports. To one of the downstream ports ethernet MAC is connected as endpoint
device. Other two downstream ports are supposed to connect to external
device. One Host can connect to QPS615 by upstream port. QPS615 switch
needs to be configured after powering on and before PCIe link was up.

The PCIe controller driver already enables link training at the host side
even before qps615 driver probe happens, due to this when driver enables
power to the switch it participates in the link training and PCIe link
may come up before configuring the switch through i2c. To prevent the
host from participating in link training, disable link training on the
host side to ensure the link does not come up before the switch is
configured via I2C.

Based up on dt property and type of the port, qps615 is configured
through i2c.

Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
---
 drivers/pci/pwrctl/Kconfig             |   8 +
 drivers/pci/pwrctl/Makefile            |   1 +
 drivers/pci/pwrctl/pci-pwrctl-qps615.c | 630 +++++++++++++++++++++++++++++++++
 3 files changed, 639 insertions(+)

diff --git a/drivers/pci/pwrctl/Kconfig b/drivers/pci/pwrctl/Kconfig
index 54589bb2403b..fe945d176b8b 100644
--- a/drivers/pci/pwrctl/Kconfig
+++ b/drivers/pci/pwrctl/Kconfig
@@ -10,3 +10,11 @@ config PCI_PWRCTL_PWRSEQ
 	tristate
 	select POWER_SEQUENCING
 	select PCI_PWRCTL
+
+config PCI_PWRCTL_QPS615
+	tristate "PCI Power Control driver for QPS615"
+	select PCI_PWRCTL
+	help
+	  Say Y here to enable the pwrctl driver for Qualcomm
+	  QPS615 PCIe switch which enables and configures it
+	  through i2c.
diff --git a/drivers/pci/pwrctl/Makefile b/drivers/pci/pwrctl/Makefile
index d308aae4800c..ac563a70c023 100644
--- a/drivers/pci/pwrctl/Makefile
+++ b/drivers/pci/pwrctl/Makefile
@@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_PWRCTL)		+= pci-pwrctl-core.o
 pci-pwrctl-core-y			:= core.o
 
 obj-$(CONFIG_PCI_PWRCTL_PWRSEQ)		+= pci-pwrctl-pwrseq.o
+obj-$(CONFIG_PCI_PWRCTL_QPS615)		+= pci-pwrctl-qps615.o
diff --git a/drivers/pci/pwrctl/pci-pwrctl-qps615.c b/drivers/pci/pwrctl/pci-pwrctl-qps615.c
new file mode 100644
index 000000000000..c338e35c9083
--- /dev/null
+++ b/drivers/pci/pwrctl/pci-pwrctl-qps615.c
@@ -0,0 +1,630 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/pci-pwrctl.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/unaligned.h>
+
+#include "../pci.h"
+
+#define QPS615_GPIO_CONFIG		0x801208
+#define QPS615_RESET_GPIO		0x801210
+
+#define QPS615_BUS_CONTROL		0x801014
+
+#define QPS615_PORT_L0S_DELAY		0x82496c
+#define QPS615_PORT_L1_DELAY		0x824970
+
+#define QPS615_EMBEDDED_ETH_DELAY	0x8200d8
+#define QPS615_ETH_L1_DELAY_MASK	GENMASK(27, 18)
+#define QPS615_ETH_L1_DELAY_VALUE(x)	FIELD_PREP(QPS615_ETH_L1_DELAY_MASK, x)
+#define QPS615_ETH_L0S_DELAY_MASK	GENMASK(17, 13)
+#define QPS615_ETH_L0S_DELAY_VALUE(x)	FIELD_PREP(QPS615_ETH_L0S_DELAY_MASK, x)
+
+#define QPS615_NFTS_2_5_GT		0x824978
+#define QPS615_NFTS_5_GT		0x82497c
+
+#define QPS615_PORT_LANE_ACCESS_ENABLE	0x828000
+
+#define QPS615_PHY_RATE_CHANGE_OVERRIDE	0x828040
+#define QPS615_PHY_RATE_CHANGE		0x828050
+
+#define QPS615_TX_MARGIN		0x828234
+
+#define QPS615_DFE_ENABLE		0x828a04
+#define QPS615_DFE_EQ0_MODE		0x828a08
+#define QPS615_DFE_EQ1_MODE		0x828a0c
+#define QPS615_DFE_EQ2_MODE		0x828a14
+#define QPS615_DFE_PD_MASK		0x828254
+
+#define QPS615_PORT_SELECT		0x82c02c
+#define QPS615_PORT_ACCESS_ENABLE	0x82c030
+
+#define QPS615_POWER_CONTROL		0x82b09c
+#define QPS615_POWER_CONTROL_OVREN	0x82b2c8
+
+#define QPS615_FREQ_125_MHZ		125000000
+#define QPS615_FREQ_250_MHZ		250000000
+
+#define QPS615_GPIO_MASK		0xfffffff3
+
+struct qps615_pwrctl_reg_setting {
+	unsigned int offset;
+	unsigned int val;
+};
+
+enum qps615_pwrctl_ports {
+	QPS615_USP,
+	QPS615_DSP1,
+	QPS615_DSP2,
+	QPS615_DSP3,
+	QPS615_ETHERNET,
+	QPS615_MAX
+};
+
+struct qps615_pwrctl_cfg {
+	u32 l0s_delay;
+	u32 l1_delay;
+	u32 tx_amp;
+	u32 nfts;
+	bool disable_dfe;
+	bool disable_port;
+	bool axi_freq_125;
+};
+
+#define QPS615_PWRCTL_MAX_SUPPLY	6
+
+struct qps615_pwrctl_ctx {
+	struct regulator_bulk_data supplies[QPS615_PWRCTL_MAX_SUPPLY];
+	struct qps615_pwrctl_cfg cfg[QPS615_MAX];
+	struct gpio_desc *reset_gpio;
+	struct i2c_adapter *adapter;
+	struct i2c_client *client;
+	struct pci_pwrctl pwrctl;
+};
+
+/*
+ * downstream port power off sequence, hardcoding the address
+ * as we don't know register names for these register offsets.
+ */
+static const struct qps615_pwrctl_reg_setting common_pwroff_seq[] = {
+	{0x82900c, 0x1},
+	{0x829010, 0x1},
+	{0x829018, 0x0},
+	{0x829020, 0x1},
+	{0x82902c, 0x1},
+	{0x829030, 0x1},
+	{0x82903c, 0x1},
+	{0x829058, 0x0},
+	{0x82905c, 0x1},
+	{0x829060, 0x1},
+	{0x8290cc, 0x1},
+	{0x8290d0, 0x1},
+	{0x8290d8, 0x1},
+	{0x8290e0, 0x1},
+	{0x8290e8, 0x1},
+	{0x8290ec, 0x1},
+	{0x8290f4, 0x1},
+	{0x82910c, 0x1},
+	{0x829110, 0x1},
+	{0x829114, 0x1},
+};
+
+static const struct qps615_pwrctl_reg_setting dsp1_pwroff_seq[] = {
+	{QPS615_PORT_ACCESS_ENABLE, 0x2},
+	{QPS615_PORT_LANE_ACCESS_ENABLE, 0x3},
+	{QPS615_POWER_CONTROL, 0x014f4804},
+	{QPS615_POWER_CONTROL_OVREN, 0x1},
+	{QPS615_PORT_ACCESS_ENABLE, 0x4},
+};
+
+static const struct qps615_pwrctl_reg_setting dsp2_pwroff_seq[] = {
+	{QPS615_PORT_ACCESS_ENABLE, 0x8},
+	{QPS615_PORT_LANE_ACCESS_ENABLE, 0x1},
+	{QPS615_POWER_CONTROL, 0x014f4804},
+	{QPS615_POWER_CONTROL_OVREN, 0x1},
+	{QPS615_PORT_ACCESS_ENABLE, 0x8},
+};
+
+/*
+ * Since all transfers are initiated by the probe, no locks are necessary,
+ * ensuring there are no concurrent calls.
+ */
+static int qps615_pwrctl_i2c_write(struct i2c_client *client,
+				   u32 reg_addr, u32 reg_val)
+{
+	struct i2c_msg msg;
+	u8 msg_buf[7];
+	int ret;
+
+	msg.addr = client->addr;
+	msg.len = 7;
+	msg.flags = 0;
+
+	/* Big Endian for reg addr */
+	put_unaligned_be24(reg_addr, &msg_buf[0]);
+
+	/* Little Endian for reg val */
+	put_unaligned_le32(reg_val, &msg_buf[3]);
+
+	msg.buf = msg_buf;
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	return ret == 1 ? 0 : ret;
+}
+
+static int qps615_pwrctl_i2c_read(struct i2c_client *client,
+				  u32 reg_addr, u32 *reg_val)
+{
+	struct i2c_msg msg[2];
+	u8 wr_data[3];
+	u32 rd_data;
+	int ret;
+
+	msg[0].addr = client->addr;
+	msg[0].len = 3;
+	msg[0].flags = 0;
+
+	/* Big Endian for reg addr */
+	put_unaligned_be24(reg_addr, &wr_data[0]);
+
+	msg[0].buf = wr_data;
+
+	msg[1].addr = client->addr;
+	msg[1].len = 4;
+	msg[1].flags = I2C_M_RD;
+
+	msg[1].buf = (u8 *)&rd_data;
+
+	ret = i2c_transfer(client->adapter, &msg[0], 2);
+	if (ret == 2) {
+		*reg_val = get_unaligned_le32(&rd_data);
+		return 0;
+	}
+
+	/* If only one message successfully completed, return -ENODEV */
+	return ret == 1 ? -ENODEV : ret;
+}
+
+static int qps615_pwrctl_i2c_bulk_write(struct i2c_client *client,
+					const struct qps615_pwrctl_reg_setting *seq, int len)
+{
+	int ret, i;
+
+	for (i = 0; i < len; i++) {
+		ret = qps615_pwrctl_i2c_write(client, seq[i].offset, seq[i].val);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int qps615_pwrctl_disable_port(struct qps615_pwrctl_ctx *ctx,
+				      enum qps615_pwrctl_ports port)
+{
+	const struct qps615_pwrctl_reg_setting *seq;
+	int ret, len;
+
+	if (port == QPS615_DSP1) {
+		seq = dsp1_pwroff_seq;
+		len = ARRAY_SIZE(dsp1_pwroff_seq);
+	} else {
+		seq = dsp2_pwroff_seq;
+		len = ARRAY_SIZE(dsp2_pwroff_seq);
+	}
+
+	ret = qps615_pwrctl_i2c_bulk_write(ctx->client, seq, len);
+	if (ret)
+		return ret;
+
+	return qps615_pwrctl_i2c_bulk_write(ctx->client,
+					    common_pwroff_seq, ARRAY_SIZE(common_pwroff_seq));
+}
+
+static int qps615_pwrctl_set_l0s_l1_entry_delay(struct qps615_pwrctl_ctx *ctx,
+						enum qps615_pwrctl_ports port, bool is_l1, u32 ns)
+{
+	u32 rd_val, units, mask;
+	int ret;
+
+	/* convert to units of 256ns */
+	units = ns / 256;
+
+	if (port == QPS615_ETHERNET) {
+		ret = qps615_pwrctl_i2c_read(ctx->client, QPS615_EMBEDDED_ETH_DELAY, &rd_val);
+		if (ret)
+			return ret;
+		mask = is_l1 ? QPS615_ETH_L1_DELAY_MASK : QPS615_ETH_L0S_DELAY_MASK;
+		rd_val = u32_replace_bits(rd_val, units, mask);
+		return qps615_pwrctl_i2c_write(ctx->client, QPS615_EMBEDDED_ETH_DELAY, rd_val);
+	}
+
+	ret = qps615_pwrctl_i2c_write(ctx->client, QPS615_PORT_SELECT, BIT(port));
+	if (ret)
+		return ret;
+
+	return qps615_pwrctl_i2c_write(ctx->client,
+				       is_l1 ? QPS615_PORT_L1_DELAY : QPS615_PORT_L0S_DELAY, units);
+}
+
+static int qps615_pwrctl_set_tx_amplitude(struct qps615_pwrctl_ctx *ctx,
+					  enum qps615_pwrctl_ports port, u32 amp)
+{
+	int port_access;
+
+	switch (port) {
+	case QPS615_USP:
+		port_access = 0x1;
+		break;
+	case QPS615_DSP1:
+		port_access = 0x2;
+		break;
+	case QPS615_DSP2:
+		port_access = 0x8;
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	struct qps615_pwrctl_reg_setting tx_amp_seq[] = {
+		{QPS615_PORT_ACCESS_ENABLE, port_access},
+		{QPS615_PORT_LANE_ACCESS_ENABLE, 0x3},
+		{QPS615_TX_MARGIN, amp},
+	};
+
+	return qps615_pwrctl_i2c_bulk_write(ctx->client, tx_amp_seq, ARRAY_SIZE(tx_amp_seq));
+}
+
+static int qps615_pwrctl_disable_dfe(struct qps615_pwrctl_ctx *ctx,
+				     enum qps615_pwrctl_ports port)
+{
+	int port_access, lane_access = 0x3;
+	u32 phy_rate = 0x21;
+
+	switch (port) {
+	case QPS615_USP:
+		phy_rate = 0x1;
+		port_access = 0x1;
+		break;
+	case QPS615_DSP1:
+		port_access = 0x2;
+		break;
+	case QPS615_DSP2:
+		port_access = 0x8;
+		lane_access = 0x1;
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	struct qps615_pwrctl_reg_setting disable_dfe_seq[] = {
+		{QPS615_PORT_ACCESS_ENABLE, port_access},
+		{QPS615_PORT_LANE_ACCESS_ENABLE, lane_access},
+		{QPS615_DFE_ENABLE, 0x0},
+		{QPS615_DFE_EQ0_MODE, 0x411},
+		{QPS615_DFE_EQ1_MODE, 0x11},
+		{QPS615_DFE_EQ2_MODE, 0x11},
+		{QPS615_DFE_PD_MASK, 0x7},
+		{QPS615_PHY_RATE_CHANGE_OVERRIDE, 0x10},
+		{QPS615_PHY_RATE_CHANGE, phy_rate},
+		{QPS615_PHY_RATE_CHANGE, 0x0},
+		{QPS615_PHY_RATE_CHANGE_OVERRIDE, 0x0},
+	};
+
+	return qps615_pwrctl_i2c_bulk_write(ctx->client,
+					    disable_dfe_seq, ARRAY_SIZE(disable_dfe_seq));
+}
+
+static int qps615_pwrctl_set_nfts(struct qps615_pwrctl_ctx *ctx,
+				  enum qps615_pwrctl_ports port, u32 nfts)
+{
+	int ret;
+	struct qps615_pwrctl_reg_setting nfts_seq[] = {
+		{QPS615_NFTS_2_5_GT, nfts},
+		{QPS615_NFTS_5_GT, nfts},
+	};
+
+	ret =  qps615_pwrctl_i2c_write(ctx->client, QPS615_PORT_SELECT, BIT(port));
+	if (ret)
+		return ret;
+
+	return qps615_pwrctl_i2c_bulk_write(ctx->client, nfts_seq, ARRAY_SIZE(nfts_seq));
+}
+
+static int qps615_pwrctl_assert_deassert_reset(struct qps615_pwrctl_ctx *ctx, bool deassert)
+{
+	int ret, val;
+
+	ret = qps615_pwrctl_i2c_write(ctx->client, QPS615_GPIO_CONFIG, QPS615_GPIO_MASK);
+	if (ret)
+		return ret;
+
+	val = deassert ? 0xc : 0;
+
+	return qps615_pwrctl_i2c_write(ctx->client, QPS615_RESET_GPIO, val);
+}
+
+static int qps615_pwrctl_parse_device_dt(struct qps615_pwrctl_ctx *ctx, struct device_node *node,
+					 enum qps615_pwrctl_ports port)
+{
+	struct qps615_pwrctl_cfg *cfg;
+	u32 axi_freq = 0;
+	int ret;
+
+	cfg = &ctx->cfg[port];
+
+	if (!of_device_is_available(node)) {
+		cfg->disable_port = true;
+		return 0;
+	};
+
+	ret = of_property_read_u32(node, "qcom,axi-clk-freq-hz", &axi_freq);
+	if (ret && ret != -EINVAL)
+		return ret;
+	else if (axi_freq && (axi_freq != QPS615_FREQ_125_MHZ || axi_freq != QPS615_FREQ_250_MHZ))
+		return -EINVAL;
+	else if (axi_freq == QPS615_FREQ_125_MHZ)
+		cfg->axi_freq_125 = true;
+
+	ret = of_property_read_u32(node, "qcom,l0s-entry-delay-ns", &cfg->l0s_delay);
+	if (ret && ret != -EINVAL)
+		return ret;
+
+	ret = of_property_read_u32(node, "qcom,l1-entry-delay-ns", &cfg->l1_delay);
+	if (ret && ret != -EINVAL)
+		return ret;
+
+	ret = of_property_read_u32(node, "qcom,tx-amplitude-millivolt", &cfg->tx_amp);
+	if (ret && ret != -EINVAL)
+		return ret;
+
+	ret = of_property_read_u32(node, "qcom,nfts", &cfg->nfts);
+	if (ret && ret != -EINVAL)
+		return ret;
+
+	cfg->disable_dfe = of_property_read_bool(node, "qcom,no-dfe-support");
+
+	return 0;
+}
+
+static void qps615_pwrctl_power_off(struct qps615_pwrctl_ctx *ctx)
+{
+	gpiod_set_value(ctx->reset_gpio, 1);
+
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+}
+
+static int qps615_pwrctl_power_on(struct qps615_pwrctl_ctx *ctx)
+{
+	struct qps615_pwrctl_cfg *cfg;
+	int ret, i;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return dev_err_probe(ctx->pwrctl.dev, ret, "cannot enable regulators\n");
+
+	gpiod_set_value(ctx->reset_gpio, 0);
+
+	 /* wait for the internal osc frequency to stablise */
+	usleep_range(10000, 10500);
+
+	ret = qps615_pwrctl_assert_deassert_reset(ctx, false);
+	if (ret)
+		goto out;
+
+	if (ctx->cfg[QPS615_USP].axi_freq_125) {
+		ret = qps615_pwrctl_i2c_write(ctx->client, QPS615_BUS_CONTROL, BIT(16));
+		if (ret)
+			dev_err(ctx->pwrctl.dev, "Setting AXI clk freq failed %d\n", ret);
+	}
+
+	for (i = 0; i < QPS615_MAX; i++) {
+		cfg = &ctx->cfg[i];
+		if (cfg->disable_port) {
+			ret = qps615_pwrctl_disable_port(ctx, i);
+			if (ret) {
+				dev_err(ctx->pwrctl.dev, "Disabling port failed\n");
+				goto out;
+			}
+		}
+
+		if (cfg->l0s_delay) {
+			ret = qps615_pwrctl_set_l0s_l1_entry_delay(ctx, i, false, cfg->l0s_delay);
+			if (ret) {
+				dev_err(ctx->pwrctl.dev, "Setting L0s entry delay failed\n");
+				goto out;
+			}
+		}
+
+		if (cfg->l1_delay) {
+			ret = qps615_pwrctl_set_l0s_l1_entry_delay(ctx, i, true, cfg->l1_delay);
+			if (ret) {
+				dev_err(ctx->pwrctl.dev, "Setting L1 entry delay failed\n");
+				goto out;
+			}
+		}
+
+		if (cfg->tx_amp) {
+			ret = qps615_pwrctl_set_tx_amplitude(ctx, i, cfg->tx_amp);
+			if (ret) {
+				dev_err(ctx->pwrctl.dev, "Setting Tx amplitube failed\n");
+				goto out;
+			}
+		}
+
+		if (cfg->nfts) {
+			ret = qps615_pwrctl_set_nfts(ctx, i, cfg->nfts);
+			if (ret) {
+				dev_err(ctx->pwrctl.dev, "Setting nfts failed\n");
+				goto out;
+			}
+		}
+
+		if (cfg->disable_dfe) {
+			ret = qps615_pwrctl_disable_dfe(ctx, i);
+			if (ret) {
+				dev_err(ctx->pwrctl.dev, "Disabling DFE failed\n");
+				goto out;
+			}
+		}
+	}
+
+	ret = qps615_pwrctl_assert_deassert_reset(ctx, true);
+	if (!ret)
+		return 0;
+
+out:
+	qps615_pwrctl_power_off(ctx);
+	return ret;
+}
+
+static int qps615_pwrctl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct pci_host_bridge *bridge;
+	enum qps615_pwrctl_ports port;
+	struct qps615_pwrctl_ctx *ctx;
+	int ret, addr;
+
+	bridge = pci_find_host_bridge(to_pci_dev(dev->parent)->bus);
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ret = of_property_read_u32_index(pdev->dev.of_node, "i2c-parent", 1, &addr);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to read i2c-parent property\n");
+
+	ctx->adapter = of_find_i2c_adapter_by_node(of_parse_phandle(dev->of_node, "i2c-parent", 0));
+	of_node_put(dev->of_node);
+	if (!ctx->adapter)
+		return dev_err_probe(dev, -EPROBE_DEFER, "Failed to find I2C adapter\n");
+
+	ctx->client = i2c_new_dummy_device(ctx->adapter, addr);
+	if (IS_ERR(ctx->client)) {
+		dev_err(dev, "Failed to create I2C client\n");
+		i2c_put_adapter(ctx->adapter);
+		return PTR_ERR(ctx->client);
+	}
+
+	ctx->supplies[0].supply = "vddc";
+	ctx->supplies[1].supply = "vdd18";
+	ctx->supplies[2].supply = "vdd09";
+	ctx->supplies[3].supply = "vddio1";
+	ctx->supplies[4].supply = "vddio2";
+	ctx->supplies[5].supply = "vddio18";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret) {
+		dev_err_probe(dev, ret,
+			      "failed to get supply regulator\n");
+		goto remove_i2c;
+	}
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(ctx->reset_gpio)) {
+		ret = dev_err_probe(dev, PTR_ERR(ctx->reset_gpio), "failed to get reset GPIO\n");
+		goto remove_i2c;
+	}
+
+	platform_set_drvdata(pdev, ctx);
+
+	pci_pwrctl_init(&ctx->pwrctl, dev);
+
+	port = QPS615_USP;
+	ret = qps615_pwrctl_parse_device_dt(ctx, pdev->dev.of_node, port);
+	if (ret) {
+		dev_err(dev, "failed to parse device tree properties: %d\n", ret);
+		goto remove_i2c;
+	}
+
+	/*
+	 * Downstream ports are always children of the upstream port.
+	 * The first node represents DSP1, the second node represents DSP2, and so on.
+	 */
+	for_each_child_of_node_scoped(pdev->dev.of_node, child) {
+		ret = qps615_pwrctl_parse_device_dt(ctx, child, port++);
+		if (ret)
+			break;
+		/* Embedded ethernet device are under DSP3 */
+		if (port == QPS615_DSP3)
+			for_each_child_of_node_scoped(child, child1) {
+				ret = qps615_pwrctl_parse_device_dt(ctx, child1, port++);
+				if (ret)
+					break;
+			}
+	}
+	if (ret) {
+		dev_err(dev, "failed to parse device tree properties: %d\n", ret);
+		goto remove_i2c;
+	}
+
+	if (bridge->ops->stop_link)
+		bridge->ops->stop_link(to_pci_dev(dev->parent)->bus);
+
+	ret = qps615_pwrctl_power_on(ctx);
+	if (ret)
+		goto remove_i2c;
+
+	if (bridge->ops->start_link) {
+		ret = bridge->ops->start_link(to_pci_dev(dev->parent)->bus);
+		if (ret)
+			goto power_off;
+	}
+
+	ret = devm_pci_pwrctl_device_set_ready(dev, &ctx->pwrctl);
+	if (ret)
+		goto power_off;
+
+	return 0;
+
+power_off:
+	qps615_pwrctl_power_off(ctx);
+remove_i2c:
+	i2c_unregister_device(ctx->client);
+	i2c_put_adapter(ctx->adapter);
+	return ret;
+}
+
+static void qps615_pwrctl_remove(struct platform_device *pdev)
+{
+	struct qps615_pwrctl_ctx *ctx = platform_get_drvdata(pdev);
+
+	qps615_pwrctl_power_off(ctx);
+	i2c_unregister_device(ctx->client);
+	i2c_put_adapter(ctx->adapter);
+}
+
+static const struct of_device_id qps615_pwrctl_of_match[] = {
+	{ .compatible = "pci1179,0623"},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, qps615_pwrctl_of_match);
+
+static struct platform_driver qps615_pwrctl_driver = {
+	.driver = {
+		.name = "pwrctl-qps615",
+		.of_match_table = qps615_pwrctl_of_match,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
+	.probe = qps615_pwrctl_probe,
+	.remove_new = qps615_pwrctl_remove,
+};
+module_platform_driver(qps615_pwrctl_driver);
+
+MODULE_AUTHOR("Krishna chaitanya chundru <quic_krichai@...cinc.com>");
+MODULE_DESCRIPTION("Qualcomm QPS615 power control driver");
+MODULE_LICENSE("GPL");

-- 
2.34.1

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