new file mode 100644
@@ -0,0 +1,222 @@
+Upstream-Status: Pending [Not submitted to upstream yet]
+Signed-off-by: Emekcan Aras <emekcan.aras@arm.com>
+
+From e683c37ee51717e625c8a598056cf4bb1bdadcbc Mon Sep 17 00:00:00 2001
+From: Emekcan <emekcan.aras@arm.com>
+Date: Wed, 17 Aug 2022 14:21:42 +0100
+Subject: [PATCH] Add rpsmg driver for corstone1000
+
+Adds rpsmg driver to communicate with external
+system in corstone1000 platform.
+
+Signed-off-by: Emekcan Aras <emekcan.aras@arm.com>
+---
+ drivers/rpmsg/Kconfig | 10 ++
+ drivers/rpmsg/Makefile | 1 +
+ drivers/rpmsg/rpmsg_arm_mailbox.c | 164 ++++++++++++++++++++++
+ 3 files changed, 175 insertions(+)
+ create mode 100644 drivers/rpmsg/rpmsg_arm_mailbox.c
+
+diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig
+index 0b4407abdf13..c276bd17bffe 100644
+--- a/drivers/rpmsg/Kconfig
++++ b/drivers/rpmsg/Kconfig
+@@ -73,4 +73,14 @@ config RPMSG_VIRTIO
+ select RPMSG_NS
+ select VIRTIO
+
++config RPMSG_ARM
++ tristate "ARM RPMSG driver"
++ select RPMSG
++ depends on HAS_IOMEM
++ depends on MAILBOX
++ help
++ Say y here to enable support for rpmsg lient driver which is built
++ around mailbox client using Arm MHUv2.1 as physical medium.This
++ driver enables communication which remote processor using MHU.
++
+ endmenu
+diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
+index 8d452656f0ee..34e9c146cd64 100644
+--- a/drivers/rpmsg/Makefile
++++ b/drivers/rpmsg/Makefile
+@@ -1,5 +1,6 @@
+ # SPDX-License-Identifier: GPL-2.0
+ obj-$(CONFIG_RPMSG) += rpmsg_core.o
++obj-$(CONFIG_RPMSG_ARM) += rpmsg_arm_mailbox.o
+ obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o
+ obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o
+ obj-$(CONFIG_RPMSG_MTK_SCP) += mtk_rpmsg.o
+diff --git a/drivers/rpmsg/rpmsg_arm_mailbox.c b/drivers/rpmsg/rpmsg_arm_mailbox.c
+new file mode 100644
+index 000000000000..4a80102669f6
+--- /dev/null
++++ b/drivers/rpmsg/rpmsg_arm_mailbox.c
+@@ -0,0 +1,164 @@
++// SPDX-License-Identifier: GPL-2.0
++/*
++ * rpmsg client driver using mailbox client interface
++ *
++ * Copyright (C) 2019 ARM Ltd.
++ *
++ */
++
++#include <linux/bitmap.h>
++#include <linux/export.h>
++#include <linux/io.h>
++#include <linux/kernel.h>
++#include <linux/ktime.h>
++#include <linux/mailbox_client.h>
++#include <linux/module.h>
++#include <linux/of_address.h>
++#include <linux/of_device.h>
++#include <linux/processor.h>
++#include <linux/semaphore.h>
++#include <linux/slab.h>
++#include <linux/rpmsg.h>
++#include "rpmsg_internal.h"
++#include <linux/mailbox/arm_mhuv2_message.h>
++
++#define RPMSG_NAME "arm_rpmsg"
++#define RPMSG_ADDR_ANY 0xFFFFFFFF
++
++struct arm_channel {
++ struct rpmsg_endpoint ept;
++ struct mbox_client cl;
++ struct mbox_chan *mbox;
++};
++
++#define arm_channel_from_rpmsg(_ept) container_of(_ept, struct arm_channel, ept)
++#define arm_channel_from_mbox(_ept) container_of(_ept, struct arm_channel, cl)
++
++
++static void arm_msg_rx_handler(struct mbox_client *cl, void *mssg)
++{
++ struct arm_mhuv2_mbox_msg *msg = mssg;
++ struct arm_channel* channel = arm_channel_from_mbox(cl);
++ int err = channel->ept.cb(channel->ept.rpdev, msg->data, 4, channel->ept.priv, RPMSG_ADDR_ANY);
++ if(err) {
++ printk("ARM Mailbox: Endpoint callback failed with error: %d", err);
++ }
++}
++
++
++static void arm_destroy_ept(struct rpmsg_endpoint *ept)
++{
++ struct arm_channel *channel = arm_channel_from_rpmsg(ept);
++ mbox_free_channel(channel->mbox);
++ kfree(channel);
++}
++
++static int arm_send(struct rpmsg_endpoint *ept, void *data, int len)
++{
++ struct arm_channel *channel = arm_channel_from_rpmsg(ept);
++
++ mbox_send_message(channel->mbox, data);
++ return 0;
++}
++
++static int arm_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dest)
++{
++ struct arm_mhuv2_mbox_msg msg;
++ struct arm_channel *channel = arm_channel_from_rpmsg(ept);
++ msg.data = data;
++ msg.len = len;
++ mbox_send_message(channel->mbox, &msg);
++ return 0;
++}
++
++
++static const struct rpmsg_endpoint_ops arm_endpoint_ops = {
++ .destroy_ept = arm_destroy_ept,
++ .send = arm_send,
++ .sendto = arm_sendto,
++};
++
++
++static struct rpmsg_endpoint *arm_create_ept(struct rpmsg_device *rpdev,
++ rpmsg_rx_cb_t cb, void *priv, struct rpmsg_channel_info chinfo)
++{
++ struct arm_channel *channel;
++
++ channel = kzalloc(sizeof(*channel), GFP_KERNEL);
++
++ // Initialize rpmsg endpoint
++ kref_init(&channel->ept.refcount);
++ channel->ept.rpdev = rpdev;
++ channel->ept.cb = cb;
++ channel->ept.priv = priv;
++ channel->ept.ops = &arm_endpoint_ops;
++
++ // Initialize mailbox client
++ channel->cl.dev = rpdev->dev.parent;
++ channel->cl.rx_callback = arm_msg_rx_handler;
++ channel->cl.tx_done = NULL; /* operate in blocking mode */
++ channel->cl.tx_block = true;
++ channel->cl.tx_tout = 500; /* by half a second */
++ channel->cl.knows_txdone = false; /* depending upon protocol */
++
++ channel->mbox = mbox_request_channel_byname(&channel->cl, chinfo.name);
++ if (IS_ERR_OR_NULL(channel->mbox)) {
++ printk("RPMsg ARM: Cannot get channel by name: '%s'\n", chinfo.name);
++ return -1;
++ }
++
++ return &channel->ept;
++}
++
++static const struct rpmsg_device_ops arm_device_ops = {
++ .create_ept = arm_create_ept,
++};
++
++
++static void arm_release_device(struct device *dev)
++{
++ struct rpmsg_device *rpdev = to_rpmsg_device(dev);
++
++ kfree(rpdev);
++}
++
++
++static int client_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct rpmsg_device *rpdev;
++
++ rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
++ if (!rpdev)
++ return -ENOMEM;
++
++ /* Assign callbacks for rpmsg_device */
++ rpdev->ops = &arm_device_ops;
++
++ /* Assign public information to the rpmsg_device */
++ memcpy(rpdev->id.name, RPMSG_NAME, strlen(RPMSG_NAME));
++
++ rpdev->dev.parent = dev;
++ rpdev->dev.release = arm_release_device;
++
++ return rpmsg_chrdev_register_device(rpdev);
++}
++
++static const struct of_device_id client_of_match[] = {
++ { .compatible = "arm,client", .data = NULL },
++ { /* Sentinel */ },
++};
++
++static struct platform_driver client_driver = {
++ .driver = {
++ .name = "arm-mhu-client",
++ .of_match_table = client_of_match,
++ },
++ .probe = client_probe,
++};
++
++module_platform_driver(client_driver);
++
++MODULE_LICENSE("GPL v2");
++MODULE_DESCRIPTION("ARM RPMSG Driver");
++MODULE_AUTHOR("Tushar Khandelwal <tushar.khandelwal@arm.com>");
+--
+2.17.1
+
@@ -92,4 +92,9 @@ CONFIG_LIBCRC32C=y
CONFIG_DEBUG_FS=y
CONFIG_PANIC_TIMEOUT=5
CONFIG_STACKTRACE=y
-CONFIG_EXTSYS_CTRL=y
\ No newline at end of file
+CONFIG_EXTSYS_CTRL=y
+CONFIG_MAILBOX=y
+CONFIG_ARM_MHU_V2=y
+CONFIG_RPMSG=y
+CONFIG_RPMSG_CHAR=y
+CONFIG_RPMSG_ARM=y
@@ -42,6 +42,7 @@ SRC_URI:append:corstone1000 = " \
file://defconfig \
file://0001-UPSTREAM-firmware-arm_ffa-Handle-compatibility-with-.patch \
file://0002-Add-external-system-driver.patch \
+ file://0003-Add-rpsmg-driver-for-corstone1000.patch \
"
SRC_URI:append:corstone1000 = " ${@bb.utils.contains('MACHINE_FEATURES', \