diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig
index e841c10..300b2db 100644
--- a/drivers/bus/mhi/Kconfig
+++ b/drivers/bus/mhi/Kconfig
@@ -20,3 +20,11 @@ config MHI_BUS_DEBUG
 	  Enable debugfs support for use with the MHI transport. Allows
 	  reading and/or modifying some values within the MHI controller
 	  for debug and test purposes.
+
+config MHI_BUS_PCI_MODEM
+	tristate "MHI WWAN modem PCI controller driver"
+	depends on MHI_BUS
+	depends on PCI
+	help
+	  This driver provides PCI controller driver for MHI WWAN modem
+	  devices such as Qualcomm SDX55 based PCIe modems.
diff --git a/drivers/bus/mhi/Makefile b/drivers/bus/mhi/Makefile
index 19e6443..94ca2aa 100644
--- a/drivers/bus/mhi/Makefile
+++ b/drivers/bus/mhi/Makefile
@@ -1,2 +1,4 @@
 # core layer
 obj-y += core/
+
+obj-$(CONFIG_MHI_BUS_PCI_MODEM) := mhi_pci_modem.o
diff --git a/drivers/bus/mhi/mhi_pci_modem.c b/drivers/bus/mhi/mhi_pci_modem.c
new file mode 100644
index 0000000..b69b5ad
--- /dev/null
+++ b/drivers/bus/mhi/mhi_pci_modem.c
@@ -0,0 +1,313 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MHI PCI driver - MHI over PCI controller driver
+ *
+ * This module is a generic driver for registering pure MHI-over-PCI devices,
+ * such as PCIe QCOM modems.
+ *
+ * Copyright (C) 2020 Linaro Ltd <loic.poulain@linaro.org>
+ */
+
+#include <linux/device.h>
+#include <linux/mhi.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+
+#define MHI_PCI_BAR_NUM 0
+
+struct mhi_pci_dev_info {
+	const struct mhi_controller_config *config;
+	const char *name;
+};
+
+#define MHI_CHANNEL_CONFIG_SIMPLE_TX(cnum, cname, elems, event)	\
+	{							\
+		.num = cnum,					\
+		.name = cname,					\
+		.num_elements = elems,				\
+		.event_ring = event,				\
+		.dir = DMA_TO_DEVICE,				\
+		.ee_mask = BIT(MHI_EE_AMSS),			\
+		.pollcfg = 0,					\
+		.doorbell = MHI_DB_BRST_DISABLE,		\
+		.lpm_notify = false,				\
+		.offload_channel = false,			\
+		.doorbell_mode_switch = false,			\
+	}							\
+
+#define MHI_CHANNEL_CONFIG_SIMPLE_RX(cnum, cname, elems, event) \
+	{							\
+		.num = cnum,					\
+		.name = cname,					\
+		.num_elements = elems,				\
+		.event_ring = event,				\
+		.dir = DMA_FROM_DEVICE,				\
+		.ee_mask = BIT(MHI_EE_AMSS),			\
+		.pollcfg = 0,					\
+		.doorbell = MHI_DB_BRST_DISABLE,		\
+		.lpm_notify = false,				\
+		.offload_channel = false,			\
+		.doorbell_mode_switch = false,			\
+	}
+
+#define MHI_EVENT_CONFIG_SIMPLE_CTRL(enum)	\
+	{					\
+		.num_elements = 64,		\
+		.irq_moderation_ms = 5,		\
+		.irq = enum,			\
+		.priority = 1,			\
+		.mode = MHI_DB_BRST_DISABLE,	\
+		.data_type = MHI_ER_CTRL,	\
+		.hardware_event = false,	\
+		.client_managed = false,	\
+		.offload_channel = false,	\
+	}
+
+#define MHI_EVENT_CONFIG_SIMPLE_DATA(enum)	\
+	{					\
+		.num_elements = 64,		\
+		.irq_moderation_ms = 5,		\
+		.irq = enum,			\
+		.priority = 1,			\
+		.mode = MHI_DB_BRST_DISABLE,	\
+		.data_type = MHI_ER_DATA,	\
+		.hardware_event = false,	\
+		.client_managed = false,	\
+		.offload_channel = false,	\
+	}
+
+static const struct mhi_channel_config modem_qcom_v1_mhi_channels[] = {
+	MHI_CHANNEL_CONFIG_SIMPLE_TX(12, "MBIM", 4, 0),
+	MHI_CHANNEL_CONFIG_SIMPLE_RX(13, "MBIM", 4, 0),
+	MHI_CHANNEL_CONFIG_SIMPLE_TX(14, "QMI", 4, 0),
+	MHI_CHANNEL_CONFIG_SIMPLE_RX(15, "QMI", 4, 0),
+	MHI_CHANNEL_CONFIG_SIMPLE_TX(20, "IPCR", 16, 0),
+	MHI_CHANNEL_CONFIG_SIMPLE_RX(21, "IPCR", 4, 0),
+	MHI_CHANNEL_CONFIG_SIMPLE_TX(34, "IP_SW0", 16, 1),
+	MHI_CHANNEL_CONFIG_SIMPLE_RX(35, "IP_SW0", 16, 1)
+};
+
+static const struct mhi_event_config modem_qcom_v1_mhi_events[] = {
+	/* first ring is control+data ring */
+	MHI_EVENT_CONFIG_SIMPLE_CTRL(0),
+	/* dedicated ring for IP data */
+	MHI_EVENT_CONFIG_SIMPLE_DATA(1)
+};
+
+static const struct mhi_controller_config modem_qcom_v1_mhi_config = {
+	.max_channels = 128,
+	.timeout_ms = 5000,
+	.num_channels = ARRAY_SIZE(modem_qcom_v1_mhi_channels),
+	.ch_cfg = modem_qcom_v1_mhi_channels,
+	.num_events = ARRAY_SIZE(modem_qcom_v1_mhi_events),
+	.event_cfg = modem_qcom_v1_mhi_events,
+};
+
+static const struct mhi_pci_dev_info mhi_qcom_sdx55_info = {
+	.name = "qcom-sdx55",
+	.config = &modem_qcom_v1_mhi_config
+};
+
+static const struct pci_device_id mhi_pci_id_table[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306),
+		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info },
+	{  }
+};
+MODULE_DEVICE_TABLE(pci, mhi_pci_id_table);
+
+static int mhi_pci_read_reg(struct mhi_controller *mhic, void __iomem *addr,
+			    u32 *out)
+{
+	*out = readl(addr);
+	return 0;
+}
+
+static void mhi_pci_write_reg(struct mhi_controller *mhic, void __iomem *addr,
+			      u32 val)
+{
+	writel(val, addr);
+}
+
+static void mhi_pci_status_cb(struct mhi_controller *mhi_cntrl,
+			      enum mhi_callback cb)
+{
+	return;
+}
+
+static int mhi_pci_claim(struct mhi_controller *mhic)
+{
+	struct pci_dev *pdev = to_pci_dev(mhic->cntrl_dev);
+	int err;
+
+	err = pci_assign_resource(pdev, MHI_PCI_BAR_NUM);
+	if (err)
+		return err;
+
+	err = pcim_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "failed to enable pci device: %d\n", err);
+		return err;
+	}
+
+	err = pcim_iomap_regions(pdev, 1 << MHI_PCI_BAR_NUM, pci_name(pdev));
+	if (err) {
+		dev_err(&pdev->dev, "failed to map pci region: %d\n", err);
+		return err;
+	}
+	mhic->regs = pcim_iomap_table(pdev)[MHI_PCI_BAR_NUM];
+
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+	if (err) {
+		dev_err(&pdev->dev, "Cannot set proper DMA mask\n");
+		return err;
+	}
+
+	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+	if (err) {
+		dev_err(&pdev->dev, "set consistent dma mask failed\n");
+		return err;
+	}
+
+	pci_set_master(pdev);
+
+	return 0;
+}
+
+static int mhi_pci_get_irqs(struct mhi_controller *mhic,
+			    const struct mhi_controller_config *mhic_config)
+{
+	struct pci_dev *pdev = to_pci_dev(mhic->cntrl_dev);
+	int num_vectors, i;
+	int *irq;
+
+	/*
+	 * Alloc one MSI vector per event ring, ideally...
+	 * No explicit pci_free_irq_vectors required, done by pcim_release
+	 */
+	num_vectors = pci_alloc_irq_vectors(pdev, 1, mhic_config->num_events,
+					    PCI_IRQ_MSI);
+	if (num_vectors < 0) {
+		dev_err(&pdev->dev, "Error allocating MSI vectors %d\n",
+			num_vectors);
+		return num_vectors;
+	}
+
+	if (num_vectors < mhic_config->num_events) {
+		dev_warn(&pdev->dev, "Not enough MSI vectors (%d/%d)\n",
+			 num_vectors, mhic_config->num_events);
+		/* use shared IRQ */
+	}
+
+	irq = devm_kcalloc(&pdev->dev, mhic_config->num_events, sizeof(int),
+			   GFP_KERNEL);
+	if (!irq)
+		return -ENOMEM;
+
+	for (i = 0; i < mhic_config->num_events; i++) {
+		int vector = i >= num_vectors ? (num_vectors - 1) : i;
+
+		irq[i] = pci_irq_vector(pdev, vector);
+	}
+
+	mhic->irq = irq;
+	mhic->nr_irqs = mhic_config->num_events;
+
+	return 0;
+}
+
+static int mhi_pci_runtime_get(struct mhi_controller *mhi_cntrl)
+{
+	/* no PM for now */
+	return 0;
+}
+
+static void mhi_pci_runtime_put(struct mhi_controller *mhi_cntrl)
+{
+	/* no PM for now */
+	return;
+}
+
+static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	const struct mhi_pci_dev_info *info = (struct mhi_pci_dev_info *) id->driver_data;
+	const struct mhi_controller_config *mhic_config;
+	struct mhi_controller *mhic;
+	int err;
+
+	dev_info(&pdev->dev, "MHI PCI device found: %s\n", info->name);
+
+	mhic = devm_kzalloc(&pdev->dev, sizeof(*mhic), GFP_KERNEL);
+	if (!mhic)
+		return -ENOMEM;
+
+	mhic_config = info->config;
+	mhic->cntrl_dev = &pdev->dev;
+	mhic->iova_start = 0;
+	mhic->iova_stop = 0xffffffff;
+	mhic->fw_image = NULL;
+	mhic->edl_image = NULL;
+
+	mhic->read_reg = mhi_pci_read_reg;
+	mhic->write_reg = mhi_pci_write_reg;
+	mhic->status_cb = mhi_pci_status_cb;
+	mhic->runtime_get = mhi_pci_runtime_get;
+	mhic->runtime_put = mhi_pci_runtime_put;
+
+	err = mhi_pci_claim(mhic);
+	if (err)
+		return err;
+
+	err = mhi_pci_get_irqs(mhic, mhic_config);
+	if (err)
+		return err;
+
+	pci_set_drvdata(pdev, mhic);
+
+	err = mhi_register_controller(mhic, mhic_config);
+	if (err)
+		return err;
+
+	/* MHI bus does not power up the controller by default */
+	err = mhi_prepare_for_power_up(mhic);
+	if (err) {
+		dev_err(&pdev->dev, "failed to prepare MHI controller\n");
+		goto err_unregister;
+	}
+
+	err = mhi_sync_power_up(mhic);
+	if (err) {
+		dev_err(&pdev->dev, "failed to power up MHI controller\n");
+		goto err_unprepare;
+	}
+
+	return 0;
+
+err_unprepare:
+	mhi_unprepare_after_power_down(mhic);
+
+err_unregister:
+	mhi_unregister_controller(mhic);
+
+	return err;
+}
+
+static void mhi_pci_remove(struct pci_dev *pdev)
+{
+	struct mhi_controller *mhic = pci_get_drvdata(pdev);
+
+	mhi_power_down(mhic, true);
+	mhi_unprepare_after_power_down(mhic);
+	mhi_unregister_controller(mhic);
+}
+
+static struct pci_driver mhi_pci_driver = {
+	.name		= "mhi-pci-modem",
+	.id_table	= mhi_pci_id_table,
+	.probe		= mhi_pci_probe,
+	.remove		= mhi_pci_remove
+};
+module_pci_driver(mhi_pci_driver);
+
+MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro,org>");
+MODULE_DESCRIPTION("MHI WWAN modem PCI controller driver");
+MODULE_LICENSE("GPL");
