On some Qualcomm SoCs, there is a remote processor, which controls some of
the Network-On-Chip interconnect resources. Other CPUs express their needs
by communicating with this processor. Add a driver to handle comminication
with this remote processor.

Signed-off-by: Georgi Djakov <redacted>
---
 .../bindings/interconnect/qcom-smd.txt        | 32 +++++++
 drivers/interconnect/qcom/Makefile            |  2 +
 drivers/interconnect/qcom/smd-rpm.c           | 90 +++++++++++++++++++
 drivers/interconnect/qcom/smd-rpm.h           | 15 ++++
 4 files changed, 139 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/interconnect/qcom-smd.txt
 create mode 100644 drivers/interconnect/qcom/Makefile
 create mode 100644 drivers/interconnect/qcom/smd-rpm.c
 create mode 100644 drivers/interconnect/qcom/smd-rpm.h

diff --git a/Documentation/devicetree/bindings/interconnect/qcom-smd.txt b/Documentation/devicetree/bindings/interconnect/qcom-smd.txt
new file mode 100644
index 000000000000..88a5aeb50935
--- /dev/null
+++ b/Documentation/devicetree/bindings/interconnect/qcom-smd.txt

@@ -0,0 +1,32 @@
+Qualcomm SMD-RPM interconnect driver binding
+------------------------------------------------
+The RPM (Resource Power Manager) is a dedicated hardware engine
+for managing the shared SoC resources in order to keep the lowest
+power profile. It communicates with other hardware subsystems via
+the shared memory driver (SMD) back-end and accepts requests for
+various resources.
+
+Required properties :
+- compatible : shall contain only one of the following:
+                       "qcom,interconnect-smd-rpm"
+
+Example:
+       smd {
+               compatible = "qcom,smd";
+
+               rpm {
+                       interrupts = <0 168 1>;
+                       qcom,ipc = <&apcs 8 0>;
+                       qcom,smd-edge = <15>;
+
+                       rpm_requests {
+                               compatible = "qcom,rpm-msm8916";
+                               qcom,smd-channels = "rpm_requests";
+
+                               interconnect-smd-rpm {
+                                       compatible = "qcom,interconnect-smd-rpm";
+                               };
+
+                       };
+               };
+       };

diff --git a/drivers/interconnect/qcom/Makefile b/drivers/interconnect/qcom/Makefile
new file mode 100644
index 000000000000..2a0c41db91c4
--- /dev/null
+++ b/drivers/interconnect/qcom/Makefile

@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-y += smd-rpm.o

diff --git a/drivers/interconnect/qcom/smd-rpm.c b/drivers/interconnect/qcom/smd-rpm.c
new file mode 100644
index 000000000000..0cf772f51642
--- /dev/null
+++ b/drivers/interconnect/qcom/smd-rpm.c

@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RPM over SMD communication wrapper for interconects
+ *
+ * Copyright (C) 2018 Linaro Ltd
+ * Author: Georgi Djakov <georgi.djakov@linaro.org>
+ */
+
+#include <linux/interconnect-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/soc/qcom/smd-rpm.h>
+#include "smd-rpm.h"
+
+#define        RPM_KEY_BW      0x00007762
+
+static struct qcom_icc_rpm {
+       struct qcom_smd_rpm *rpm;
+} icc_rpm_smd;
+
+struct icc_rpm_smd_req {
+       __le32 key;
+       __le32 nbytes;
+       __le32 value;
+};
+
+bool qcom_icc_rpm_smd_available(void)
+{
+       if (!icc_rpm_smd.rpm)
+               return false;
+
+       return true;
+}
+
+int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val)
+{
+       struct icc_rpm_smd_req req = {
+               .key = cpu_to_le32(RPM_KEY_BW),
+               .nbytes = cpu_to_le32(sizeof(u32)),
+               .value = cpu_to_le32(val),
+       };
+
+       return qcom_rpm_smd_write(icc_rpm_smd.rpm, ctx, rsc_type, id, &req,
+                                 sizeof(req));
+}
+EXPORT_SYMBOL(qcom_icc_rpm_smd_send);
+
+static int qcom_icc_rpm_smd_probe(struct platform_device *pdev)
+{
+       icc_rpm_smd.rpm = dev_get_drvdata(pdev->dev.parent);
+       if (!icc_rpm_smd.rpm) {
+               dev_err(&pdev->dev, "unable to retrieve handle to RPM\n");
+               return -ENODEV;
+       }
+
+       return 0;
+}
+
+static const struct of_device_id qcom_icc_rpm_smd_dt_match[] = {
+       { .compatible = "qcom,interconnect-smd-rpm", },
+       { },
+};
+
+MODULE_DEVICE_TABLE(of, qcom_interconnect_rpm_smd_dt_match);
+
+static struct platform_driver qcom_interconnect_rpm_smd_driver = {
+       .driver = {
+               .name           = "qcom-interconnect-smd-rpm",
+               .of_match_table = qcom_icc_rpm_smd_dt_match,
+       },
+       .probe = qcom_icc_rpm_smd_probe,
+};
+
+static int __init rpm_smd_interconnect_init(void)
+{
+       return platform_driver_register(&qcom_interconnect_rpm_smd_driver);
+}
+subsys_initcall(rpm_smd_interconnect_init);
+
+static void __exit rpm_smd_interconnect_exit(void)
+{
+       platform_driver_unregister(&qcom_interconnect_rpm_smd_driver);
+}
+module_exit(rpm_smd_interconnect_exit)
+
+MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>");
+MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect driver");
+MODULE_LICENSE("GPL v2");

diff --git a/drivers/interconnect/qcom/smd-rpm.h b/drivers/interconnect/qcom/smd-rpm.h
new file mode 100644
index 000000000000..0f4a3da31cf6
--- /dev/null
+++ b/drivers/interconnect/qcom/smd-rpm.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018, Linaro Ltd.
+ * Author: Georgi Djakov <georgi.djakov@linaro.org>
+ */
+
+#ifndef __LINUX_INTERCONNECT_QCOM_RPM_H
+#define __LINUX_INTERCONNECT_QCOM_RPM_H