Merge tag 'soc-drivers-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc

Pull SoC driver updates from Arnd Bergmann:
 "The driver updates seem larger this time around, with changes is many
  of the SoC specific drivers, both the custom drivers/soc ones and the
  closely related subsystems (memory, bus, firmware, reset, ...).

  The at91 platform gains support for sam9x7 chips in the soc and power
  management code. This is the latest variant of one of the oldest still
  supported SoC families, using the ARM9 (ARMv5) core.

  As usual, the qualcomm snapdragon platform gets a ton of updates in
  many of their drivers to add more features and additional SoC support.
  Most of these are somewhat firmware related as the platform has a
  number of firmware based interfaces to the kernel. A notable addition
  here is the inclusion of trace events to two of these drivers.

  Herve Codina and Christophe Leroy are now sending updates for
  drivers/soc/fsl/ code through the SoC tree, this contains both PowerPC
  and Arm specific platforms and has previously been problematic to
  maintain. The first update here contains support for newer PowerPC
  variants and some cleanups.

  The turris mox firmware driver has a number of updates, mostly
  cleanups.

  The Arm SCMI firmware driver gets a major rework to modularize the
  existing code into separately loadable drivers for the various
  transports, the addition of custom NXP i.MX9 interfaces and a number
  of smaller updates.

  The Arm FF-A firmware driver gets a feature update to support the v1.2
  version of the specification.

  The reset controller drivers have some smaller cleanups and a newly
  added driver for the Intel/Mobileye EyeQ5/EyeQ6 MIPS SoCs.

  The memory controller drivers get some cleanups and refactoring for
  Tegra, TI, Freescale/NXP and a couple more platforms.

  Finally there are lots of minor updates to firmware (raspberry pi,
  tegra, imx), bus (sunxi, omap, tegra) and soc (rockchips, tegra,
  amlogic, mediatek) drivers and their DT bindings"

* tag 'soc-drivers-6.12' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (212 commits)
  firmware: imx: remove duplicate scmi_imx_misc_ctrl_get()
  platform: cznic: turris-omnia-mcu: Fix error check in omnia_mcu_register_trng()
  bus: sunxi-rsb: Simplify code with dev_err_probe()
  soc: fsl: qe: ucc: Export ucc_mux_set_grant_tsa_bkpt
  soc: fsl: cpm1: qmc: Fix dependency on fsl_soc.h
  dt-bindings: arm: rockchip: Add rk3576 compatible string to pmu.yaml
  soc: fsl: qbman: Remove redundant warnings
  soc: fsl: qbman: Use iommu_paging_domain_alloc()
  MAINTAINERS: Add QE files related to the Freescale QMC controller
  soc: fsl: cpm1: qmc: Handle QUICC Engine (QE) soft-qmc firmware
  soc: fsl: cpm1: qmc: Add support for QUICC Engine (QE) implementation
  soc: fsl: qe: Add missing PUSHSCHED command
  soc: fsl: qe: Add resource-managed muram allocators
  soc: fsl: cpm1: qmc: Introduce qmc_version
  soc: fsl: cpm1: qmc: Rename SCC_GSMRL_MODE_QMC
  soc: fsl: cpm1: qmc: Handle RPACK initialization
  soc: fsl: cpm1: qmc: Rename qmc_chan_command()
  soc: fsl: cpm1: qmc: Introduce qmc_{init,exit}_xcc() and their CPM1 version
  soc: fsl: cpm1: qmc: Introduce qmc_init_resource() and its CPM1 version
  soc: fsl: cpm1: qmc: Re-order probe() operations
  ...

1 files changed, 632 insertions, 0 deletions

diff --git a/drivers/firmware/arm_scmi/transports/optee.c b/drivers/firmware/arm_scmi/transports/optee.c
new file mode 100644
index 000000000000..56fc63edf51e
--- /dev/null
+++ b/drivers/firmware/arm_scmi/transports/optee.c
@@ -0,0 +1,632 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019-2021 Linaro Ltd.
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include <linux/uuid.h>
+#include <uapi/linux/tee.h>
+
+#include "../common.h"
+
+#define SCMI_OPTEE_MAX_MSG_SIZE		128
+
+enum scmi_optee_pta_cmd {
+	/*
+	 * PTA_SCMI_CMD_CAPABILITIES - Get channel capabilities
+	 *
+	 * [out]    value[0].a: Capability bit mask (enum pta_scmi_caps)
+	 * [out]    value[0].b: Extended capabilities or 0
+	 */
+	PTA_SCMI_CMD_CAPABILITIES = 0,
+
+	/*
+	 * PTA_SCMI_CMD_PROCESS_SMT_CHANNEL - Process SCMI message in SMT buffer
+	 *
+	 * [in]     value[0].a: Channel handle
+	 *
+	 * Shared memory used for SCMI message/response exhange is expected
+	 * already identified and bound to channel handle in both SCMI agent
+	 * and SCMI server (OP-TEE) parts.
+	 * The memory uses SMT header to carry SCMI meta-data (protocol ID and
+	 * protocol message ID).
+	 */
+	PTA_SCMI_CMD_PROCESS_SMT_CHANNEL = 1,
+
+	/*
+	 * PTA_SCMI_CMD_PROCESS_SMT_CHANNEL_MESSAGE - Process SMT/SCMI message
+	 *
+	 * [in]     value[0].a: Channel handle
+	 * [in/out] memref[1]: Message/response buffer (SMT and SCMI payload)
+	 *
+	 * Shared memory used for SCMI message/response is a SMT buffer
+	 * referenced by param[1]. It shall be 128 bytes large to fit response
+	 * payload whatever message playload size.
+	 * The memory uses SMT header to carry SCMI meta-data (protocol ID and
+	 * protocol message ID).
+	 */
+	PTA_SCMI_CMD_PROCESS_SMT_CHANNEL_MESSAGE = 2,
+
+	/*
+	 * PTA_SCMI_CMD_GET_CHANNEL - Get channel handle
+	 *
+	 * SCMI shm information are 0 if agent expects to use OP-TEE regular SHM
+	 *
+	 * [in]     value[0].a: Channel identifier
+	 * [out]    value[0].a: Returned channel handle
+	 * [in]     value[0].b: Requested capabilities mask (enum pta_scmi_caps)
+	 */
+	PTA_SCMI_CMD_GET_CHANNEL = 3,
+
+	/*
+	 * PTA_SCMI_CMD_PROCESS_MSG_CHANNEL - Process SCMI message in a MSG
+	 * buffer pointed by memref parameters
+	 *
+	 * [in]     value[0].a: Channel handle
+	 * [in]     memref[1]: Message buffer (MSG and SCMI payload)
+	 * [out]    memref[2]: Response buffer (MSG and SCMI payload)
+	 *
+	 * Shared memories used for SCMI message/response are MSG buffers
+	 * referenced by param[1] and param[2]. MSG transport protocol
+	 * uses a 32bit header to carry SCMI meta-data (protocol ID and
+	 * protocol message ID) followed by the effective SCMI message
+	 * payload.
+	 */
+	PTA_SCMI_CMD_PROCESS_MSG_CHANNEL = 4,
+};
+
+/*
+ * OP-TEE SCMI service capabilities bit flags (32bit)
+ *
+ * PTA_SCMI_CAPS_SMT_HEADER
+ * When set, OP-TEE supports command using SMT header protocol (SCMI shmem) in
+ * shared memory buffers to carry SCMI protocol synchronisation information.
+ *
+ * PTA_SCMI_CAPS_MSG_HEADER
+ * When set, OP-TEE supports command using MSG header protocol in an OP-TEE
+ * shared memory to carry SCMI protocol synchronisation information and SCMI
+ * message payload.
+ */
+#define PTA_SCMI_CAPS_NONE		0
+#define PTA_SCMI_CAPS_SMT_HEADER	BIT(0)
+#define PTA_SCMI_CAPS_MSG_HEADER	BIT(1)
+#define PTA_SCMI_CAPS_MASK		(PTA_SCMI_CAPS_SMT_HEADER | \
+					 PTA_SCMI_CAPS_MSG_HEADER)
+
+/**
+ * struct scmi_optee_channel - Description of an OP-TEE SCMI channel
+ *
+ * @channel_id: OP-TEE channel ID used for this transport
+ * @tee_session: TEE session identifier
+ * @caps: OP-TEE SCMI channel capabilities
+ * @rx_len: Response size
+ * @mu: Mutex protection on channel access
+ * @cinfo: SCMI channel information
+ * @req: union for SCMI interface
+ * @req.shmem: Virtual base address of the shared memory
+ * @req.msg: Shared memory protocol handle for SCMI request and
+ *   synchronous response
+ * @tee_shm: TEE shared memory handle @req or NULL if using IOMEM shmem
+ * @link: Reference in agent's channel list
+ */
+struct scmi_optee_channel {
+	u32 channel_id;
+	u32 tee_session;
+	u32 caps;
+	u32 rx_len;
+	struct mutex mu;
+	struct scmi_chan_info *cinfo;
+	union {
+		struct scmi_shared_mem __iomem *shmem;
+		struct scmi_msg_payld *msg;
+	} req;
+	struct tee_shm *tee_shm;
+	struct list_head link;
+};
+
+/**
+ * struct scmi_optee_agent - OP-TEE transport private data
+ *
+ * @dev: Device used for communication with TEE
+ * @tee_ctx: TEE context used for communication
+ * @caps: Supported channel capabilities
+ * @mu: Mutex for protection of @channel_list
+ * @channel_list: List of all created channels for the agent
+ */
+struct scmi_optee_agent {
+	struct device *dev;
+	struct tee_context *tee_ctx;
+	u32 caps;
+	struct mutex mu;
+	struct list_head channel_list;
+};
+
+static struct scmi_transport_core_operations *core;
+
+/* There can be only 1 SCMI service in OP-TEE we connect to */
+static struct scmi_optee_agent *scmi_optee_private;
+
+/* Open a session toward SCMI OP-TEE service with REE_KERNEL identity */
+static int open_session(struct scmi_optee_agent *agent, u32 *tee_session)
+{
+	struct device *dev = agent->dev;
+	struct tee_client_device *scmi_pta = to_tee_client_device(dev);
+	struct tee_ioctl_open_session_arg arg = { };
+	int ret;
+
+	memcpy(arg.uuid, scmi_pta->id.uuid.b, TEE_IOCTL_UUID_LEN);
+	arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL;
+
+	ret = tee_client_open_session(agent->tee_ctx, &arg, NULL);
+	if (ret < 0 || arg.ret) {
+		dev_err(dev, "Can't open tee session: %d / %#x\n", ret, arg.ret);
+		return -EOPNOTSUPP;
+	}
+
+	*tee_session = arg.session;
+
+	return 0;
+}
+
+static void close_session(struct scmi_optee_agent *agent, u32 tee_session)
+{
+	tee_client_close_session(agent->tee_ctx, tee_session);
+}
+
+static int get_capabilities(struct scmi_optee_agent *agent)
+{
+	struct tee_ioctl_invoke_arg arg = { };
+	struct tee_param param[1] = { };
+	u32 caps;
+	u32 tee_session;
+	int ret;
+
+	ret = open_session(agent, &tee_session);
+	if (ret)
+		return ret;
+
+	arg.func = PTA_SCMI_CMD_CAPABILITIES;
+	arg.session = tee_session;
+	arg.num_params = 1;
+
+	param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
+
+	ret = tee_client_invoke_func(agent->tee_ctx, &arg, param);
+
+	close_session(agent, tee_session);
+
+	if (ret < 0 || arg.ret) {
+		dev_err(agent->dev, "Can't get capabilities: %d / %#x\n", ret, arg.ret);
+		return -EOPNOTSUPP;
+	}
+
+	caps = param[0].u.value.a;
+
+	if (!(caps & (PTA_SCMI_CAPS_SMT_HEADER | PTA_SCMI_CAPS_MSG_HEADER))) {
+		dev_err(agent->dev, "OP-TEE SCMI PTA doesn't support SMT and MSG\n");
+		return -EOPNOTSUPP;
+	}
+
+	agent->caps = caps;
+
+	return 0;
+}
+
+static int get_channel(struct scmi_optee_channel *channel)
+{
+	struct device *dev = scmi_optee_private->dev;
+	struct tee_ioctl_invoke_arg arg = { };
+	struct tee_param param[1] = { };
+	unsigned int caps = 0;
+	int ret;
+
+	if (channel->tee_shm)
+		caps = PTA_SCMI_CAPS_MSG_HEADER;
+	else
+		caps = PTA_SCMI_CAPS_SMT_HEADER;
+
+	arg.func = PTA_SCMI_CMD_GET_CHANNEL;
+	arg.session = channel->tee_session;
+	arg.num_params = 1;
+
+	param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
+	param[0].u.value.a = channel->channel_id;
+	param[0].u.value.b = caps;
+
+	ret = tee_client_invoke_func(scmi_optee_private->tee_ctx, &arg, param);
+
+	if (ret || arg.ret) {
+		dev_err(dev, "Can't get channel with caps %#x: %d / %#x\n", caps, ret, arg.ret);
+		return -EOPNOTSUPP;
+	}
+
+	/* From now on use channel identifer provided by OP-TEE SCMI service */
+	channel->channel_id = param[0].u.value.a;
+	channel->caps = caps;
+
+	return 0;
+}
+
+static int invoke_process_smt_channel(struct scmi_optee_channel *channel)
+{
+	struct tee_ioctl_invoke_arg arg = {
+		.func = PTA_SCMI_CMD_PROCESS_SMT_CHANNEL,
+		.session = channel->tee_session,
+		.num_params = 1,
+	};
+	struct tee_param param[1] = { };
+	int ret;
+
+	param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
+	param[0].u.value.a = channel->channel_id;
+
+	ret = tee_client_invoke_func(scmi_optee_private->tee_ctx, &arg, param);
+	if (ret < 0 || arg.ret) {
+		dev_err(scmi_optee_private->dev, "Can't invoke channel %u: %d / %#x\n",
+			channel->channel_id, ret, arg.ret);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int invoke_process_msg_channel(struct scmi_optee_channel *channel, size_t msg_size)
+{
+	struct tee_ioctl_invoke_arg arg = {
+		.func = PTA_SCMI_CMD_PROCESS_MSG_CHANNEL,
+		.session = channel->tee_session,
+		.num_params = 3,
+	};
+	struct tee_param param[3] = { };
+	int ret;
+
+	param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
+	param[0].u.value.a = channel->channel_id;
+
+	param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
+	param[1].u.memref.shm = channel->tee_shm;
+	param[1].u.memref.size = msg_size;
+
+	param[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
+	param[2].u.memref.shm = channel->tee_shm;
+	param[2].u.memref.size = SCMI_OPTEE_MAX_MSG_SIZE;
+
+	ret = tee_client_invoke_func(scmi_optee_private->tee_ctx, &arg, param);
+	if (ret < 0 || arg.ret) {
+		dev_err(scmi_optee_private->dev, "Can't invoke channel %u: %d / %#x\n",
+			channel->channel_id, ret, arg.ret);
+		return -EIO;
+	}
+
+	/* Save response size */
+	channel->rx_len = param[2].u.memref.size;
+
+	return 0;
+}
+
+static bool scmi_optee_chan_available(struct device_node *of_node, int idx)
+{
+	u32 channel_id;
+
+	return !of_property_read_u32_index(of_node, "linaro,optee-channel-id",
+					   idx, &channel_id);
+}
+
+static void scmi_optee_clear_channel(struct scmi_chan_info *cinfo)
+{
+	struct scmi_optee_channel *channel = cinfo->transport_info;
+
+	if (!channel->tee_shm)
+		core->shmem->clear_channel(channel->req.shmem);
+}
+
+static int setup_dynamic_shmem(struct device *dev, struct scmi_optee_channel *channel)
+{
+	const size_t msg_size = SCMI_OPTEE_MAX_MSG_SIZE;
+	void *shbuf;
+
+	channel->tee_shm = tee_shm_alloc_kernel_buf(scmi_optee_private->tee_ctx, msg_size);
+	if (IS_ERR(channel->tee_shm)) {
+		dev_err(channel->cinfo->dev, "shmem allocation failed\n");
+		return -ENOMEM;
+	}
+
+	shbuf = tee_shm_get_va(channel->tee_shm, 0);
+	memset(shbuf, 0, msg_size);
+	channel->req.msg = shbuf;
+	channel->rx_len = msg_size;
+
+	return 0;
+}
+
+static int setup_static_shmem(struct device *dev, struct scmi_chan_info *cinfo,
+			      struct scmi_optee_channel *channel)
+{
+	channel->req.shmem = core->shmem->setup_iomap(cinfo, dev, true, NULL);
+	if (IS_ERR(channel->req.shmem))
+		return PTR_ERR(channel->req.shmem);
+
+	return 0;
+}
+
+static int setup_shmem(struct device *dev, struct scmi_chan_info *cinfo,
+		       struct scmi_optee_channel *channel)
+{
+	if (of_property_present(cinfo->dev->of_node, "shmem"))
+		return setup_static_shmem(dev, cinfo, channel);
+	else
+		return setup_dynamic_shmem(dev, channel);
+}
+
+static int scmi_optee_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, bool tx)
+{
+	struct scmi_optee_channel *channel;
+	uint32_t channel_id;
+	int ret;
+
+	if (!tx)
+		return -ENODEV;
+
+	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
+	if (!channel)
+		return -ENOMEM;
+
+	ret = of_property_read_u32_index(cinfo->dev->of_node, "linaro,optee-channel-id",
+					 0, &channel_id);
+	if (ret)
+		return ret;
+
+	cinfo->transport_info = channel;
+	channel->cinfo = cinfo;
+	channel->channel_id = channel_id;
+	mutex_init(&channel->mu);
+
+	ret = setup_shmem(dev, cinfo, channel);
+	if (ret)
+		return ret;
+
+	ret = open_session(scmi_optee_private, &channel->tee_session);
+	if (ret)
+		goto err_free_shm;
+
+	ret = tee_client_system_session(scmi_optee_private->tee_ctx, channel->tee_session);
+	if (ret)
+		dev_warn(dev, "Could not switch to system session, do best effort\n");
+
+	ret = get_channel(channel);
+	if (ret)
+		goto err_close_sess;
+
+	/* Enable polling */
+	cinfo->no_completion_irq = true;
+
+	mutex_lock(&scmi_optee_private->mu);
+	list_add(&channel->link, &scmi_optee_private->channel_list);
+	mutex_unlock(&scmi_optee_private->mu);
+
+	return 0;
+
+err_close_sess:
+	close_session(scmi_optee_private, channel->tee_session);
+err_free_shm:
+	if (channel->tee_shm)
+		tee_shm_free(channel->tee_shm);
+
+	return ret;
+}
+
+static int scmi_optee_chan_free(int id, void *p, void *data)
+{
+	struct scmi_chan_info *cinfo = p;
+	struct scmi_optee_channel *channel = cinfo->transport_info;
+
+	/*
+	 * Different protocols might share the same chan info, so a previous
+	 * call might have already freed the structure.
+	 */
+	if (!channel)
+		return 0;
+
+	mutex_lock(&scmi_optee_private->mu);
+	list_del(&channel->link);
+	mutex_unlock(&scmi_optee_private->mu);
+
+	close_session(scmi_optee_private, channel->tee_session);
+
+	if (channel->tee_shm) {
+		tee_shm_free(channel->tee_shm);
+		channel->tee_shm = NULL;
+	}
+
+	cinfo->transport_info = NULL;
+	channel->cinfo = NULL;
+
+	return 0;
+}
+
+static int scmi_optee_send_message(struct scmi_chan_info *cinfo,
+				   struct scmi_xfer *xfer)
+{
+	struct scmi_optee_channel *channel = cinfo->transport_info;
+	int ret;
+
+	mutex_lock(&channel->mu);
+
+	if (channel->tee_shm) {
+		core->msg->tx_prepare(channel->req.msg, xfer);
+		ret = invoke_process_msg_channel(channel,
+						 core->msg->command_size(xfer));
+	} else {
+		core->shmem->tx_prepare(channel->req.shmem, xfer, cinfo);
+		ret = invoke_process_smt_channel(channel);
+	}
+
+	if (ret)
+		mutex_unlock(&channel->mu);
+
+	return ret;
+}
+
+static void scmi_optee_fetch_response(struct scmi_chan_info *cinfo,
+				      struct scmi_xfer *xfer)
+{
+	struct scmi_optee_channel *channel = cinfo->transport_info;
+
+	if (channel->tee_shm)
+		core->msg->fetch_response(channel->req.msg,
+					  channel->rx_len, xfer);
+	else
+		core->shmem->fetch_response(channel->req.shmem, xfer);
+}
+
+static void scmi_optee_mark_txdone(struct scmi_chan_info *cinfo, int ret,
+				   struct scmi_xfer *__unused)
+{
+	struct scmi_optee_channel *channel = cinfo->transport_info;
+
+	mutex_unlock(&channel->mu);
+}
+
+static struct scmi_transport_ops scmi_optee_ops = {
+	.chan_available = scmi_optee_chan_available,
+	.chan_setup = scmi_optee_chan_setup,
+	.chan_free = scmi_optee_chan_free,
+	.send_message = scmi_optee_send_message,
+	.mark_txdone = scmi_optee_mark_txdone,
+	.fetch_response = scmi_optee_fetch_response,
+	.clear_channel = scmi_optee_clear_channel,
+};
+
+static int scmi_optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
+{
+	return ver->impl_id == TEE_IMPL_ID_OPTEE;
+}
+
+static struct scmi_desc scmi_optee_desc = {
+	.ops = &scmi_optee_ops,
+	.max_rx_timeout_ms = 30,
+	.max_msg = 20,
+	.max_msg_size = SCMI_OPTEE_MAX_MSG_SIZE,
+	.sync_cmds_completed_on_ret = true,
+};
+
+static const struct of_device_id scmi_of_match[] = {
+	{ .compatible = "linaro,scmi-optee" },
+	{ /* Sentinel */ },
+};
+
+DEFINE_SCMI_TRANSPORT_DRIVER(scmi_optee, scmi_optee_driver, scmi_optee_desc,
+			     scmi_of_match, core);
+
+static int scmi_optee_service_probe(struct device *dev)
+{
+	struct scmi_optee_agent *agent;
+	struct tee_context *tee_ctx;
+	int ret;
+
+	/* Only one SCMI OP-TEE device allowed */
+	if (scmi_optee_private) {
+		dev_err(dev, "An SCMI OP-TEE device was already initialized: only one allowed\n");
+		return -EBUSY;
+	}
+
+	tee_ctx = tee_client_open_context(NULL, scmi_optee_ctx_match, NULL, NULL);
+	if (IS_ERR(tee_ctx))
+		return -ENODEV;
+
+	agent = devm_kzalloc(dev, sizeof(*agent), GFP_KERNEL);
+	if (!agent) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	agent->dev = dev;
+	agent->tee_ctx = tee_ctx;
+	INIT_LIST_HEAD(&agent->channel_list);
+	mutex_init(&agent->mu);
+
+	ret = get_capabilities(agent);
+	if (ret)
+		goto err;
+
+	/* Ensure agent resources are all visible before scmi_optee_private is */
+	smp_mb();
+	scmi_optee_private = agent;
+
+	ret = platform_driver_register(&scmi_optee_driver);
+	if (ret) {
+		scmi_optee_private = NULL;
+		goto err;
+	}
+
+	return 0;
+
+err:
+	tee_client_close_context(tee_ctx);
+
+	return ret;
+}
+
+static int scmi_optee_service_remove(struct device *dev)
+{
+	struct scmi_optee_agent *agent = scmi_optee_private;
+
+	if (!scmi_optee_private)
+		return -EINVAL;
+
+	platform_driver_unregister(&scmi_optee_driver);
+
+	if (!list_empty(&scmi_optee_private->channel_list))
+		return -EBUSY;
+
+	/* Ensure cleared reference is visible before resources are released */
+	smp_store_mb(scmi_optee_private, NULL);
+
+	tee_client_close_context(agent->tee_ctx);
+
+	return 0;
+}
+
+static const struct tee_client_device_id scmi_optee_service_id[] = {
+	{
+		UUID_INIT(0xa8cfe406, 0xd4f5, 0x4a2e,
+			  0x9f, 0x8d, 0xa2, 0x5d, 0xc7, 0x54, 0xc0, 0x99)
+	},
+	{ }
+};
+
+MODULE_DEVICE_TABLE(tee, scmi_optee_service_id);
+
+static struct tee_client_driver scmi_optee_service_driver = {
+	.id_table	= scmi_optee_service_id,
+	.driver		= {
+		.name = "scmi-optee",
+		.bus = &tee_bus_type,
+		.probe = scmi_optee_service_probe,
+		.remove = scmi_optee_service_remove,
+	},
+};
+
+static int __init scmi_transport_optee_init(void)
+{
+	return driver_register(&scmi_optee_service_driver.driver);
+}
+module_init(scmi_transport_optee_init);
+
+static void __exit scmi_transport_optee_exit(void)
+{
+	driver_unregister(&scmi_optee_service_driver.driver);
+}
+module_exit(scmi_transport_optee_exit);
+
+MODULE_AUTHOR("Etienne Carriere <etienne.carriere@foss.st.com>");
+MODULE_DESCRIPTION("SCMI OPTEE Transport driver");
+MODULE_LICENSE("GPL");