[PATCH RFC v6 7/9] interconnect: imx: Add platform driver for imx8mn

[Leonard Crestez <leonard.crestez@nxp.com>]

Add a platform driver for the i.MX8MN SoC describing bus topology, based
on internal documentation.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
---
 drivers/interconnect/imx/Kconfig          |  4 +
 drivers/interconnect/imx/Makefile         |  1 +
 drivers/interconnect/imx/imx8mn.c         | 94 +++++++++++++++++++++++
 include/dt-bindings/interconnect/imx8mn.h | 41 ++++++++++
 4 files changed, 140 insertions(+)
 create mode 100644 drivers/interconnect/imx/imx8mn.c
 create mode 100644 include/dt-bindings/interconnect/imx8mn.h

diff --git a/drivers/interconnect/imx/Kconfig b/drivers/interconnect/imx/Kconfig
index e0d36355eeb8..bc311e86d255 100644
--- a/drivers/interconnect/imx/Kconfig
+++ b/drivers/interconnect/imx/Kconfig
@@ -6,8 +6,12 @@ config INTERCONNECT_IMX
 
 config INTERCONNECT_IMX8MM
 	def_bool y
 	depends on INTERCONNECT_IMX
 
+config INTERCONNECT_IMX8MN
+	def_bool y
+	depends on INTERCONNECT_IMX
+
 config INTERCONNECT_IMX8MQ
 	def_bool y
 	depends on INTERCONNECT_IMX
diff --git a/drivers/interconnect/imx/Makefile b/drivers/interconnect/imx/Makefile
index 8c5d6f9e47f5..e39d6c6af3b7 100644
--- a/drivers/interconnect/imx/Makefile
+++ b/drivers/interconnect/imx/Makefile
@@ -1,3 +1,4 @@
 obj-$(CONFIG_INTERCONNECT_IMX) += imx.o
 obj-$(CONFIG_INTERCONNECT_IMX8MM) += imx8mm.o
+obj-$(CONFIG_INTERCONNECT_IMX8MN) += imx8mn.o
 obj-$(CONFIG_INTERCONNECT_IMX8MQ) += imx8mq.o
diff --git a/drivers/interconnect/imx/imx8mn.c b/drivers/interconnect/imx/imx8mn.c
new file mode 100644
index 000000000000..3141ac42c8e6
--- /dev/null
+++ b/drivers/interconnect/imx/imx8mn.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Interconnect framework driver for i.MX SoC
+ *
+ * Copyright (c) 2019, NXP
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+#include <dt-bindings/interconnect/imx8mn.h>
+
+#include "imx.h"
+
+static const struct imx_icc_node_adj_desc imx8mn_dram_adj = {
+	.bw_mul = 1,
+	.bw_div = 4,
+};
+
+static const struct imx_icc_node_adj_desc imx8mn_noc_adj = {
+	.bw_mul = 1,
+	.bw_div = 4,
+};
+
+/*
+ * Describe bus masters, slaves and connections between them
+ *
+ * This is a simplified subset of the bus diagram, there are several other
+ * PL301 nics which are skipped/merged into PL301_MAIN
+ */
+static struct imx_icc_node_desc nodes[] = {
+	DEFINE_BUS_INTERCONNECT("NOC", IMX8MN_ICN_NOC, &imx8mn_noc_adj,
+			IMX8MN_ICS_DRAM, IMX8MN_ICN_MAIN),
+
+	DEFINE_BUS_SLAVE("DRAM", IMX8MN_ICS_DRAM, &imx8mn_dram_adj),
+	DEFINE_BUS_SLAVE("OCRAM", IMX8MN_ICS_OCRAM, NULL),
+	DEFINE_BUS_MASTER("A53", IMX8MN_ICM_A53, IMX8MN_ICN_NOC),
+
+	/* GPUMIX */
+	DEFINE_BUS_MASTER("GPU", IMX8MN_ICM_GPU, IMX8MN_ICN_GPU),
+	DEFINE_BUS_INTERCONNECT("PL301_GPU", IMX8MN_ICN_GPU, NULL, IMX8MN_ICN_NOC),
+
+	/* DISPLAYMIX */
+	DEFINE_BUS_MASTER("CSI1", IMX8MN_ICM_CSI1, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_MASTER("CSI2", IMX8MN_ICM_CSI2, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_MASTER("ISI", IMX8MN_ICM_ISI, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_MASTER("LCDIF", IMX8MN_ICM_LCDIF, IMX8MN_ICN_MIPI),
+	DEFINE_BUS_INTERCONNECT("PL301_MIPI", IMX8MN_ICN_MIPI, NULL, IMX8MN_ICN_NOC),
+
+	/* USB goes straight to NOC */
+	DEFINE_BUS_MASTER("USB", IMX8MN_ICM_USB, IMX8MN_ICN_NOC),
+
+	/* Audio */
+	DEFINE_BUS_MASTER("SDMA2", IMX8MN_ICM_SDMA2, IMX8MN_ICN_AUDIO),
+	DEFINE_BUS_MASTER("SDMA3", IMX8MN_ICM_SDMA3, IMX8MN_ICN_AUDIO),
+	DEFINE_BUS_INTERCONNECT("PL301_AUDIO", IMX8MN_ICN_AUDIO, NULL, IMX8MN_ICN_MAIN),
+
+	/* Ethernet */
+	DEFINE_BUS_MASTER("ENET", IMX8MN_ICM_ENET, IMX8MN_ICN_ENET),
+	DEFINE_BUS_INTERCONNECT("PL301_ENET", IMX8MN_ICN_ENET, NULL, IMX8MN_ICN_MAIN),
+
+	/* Other */
+	DEFINE_BUS_MASTER("SDMA1", IMX8MN_ICM_SDMA1, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("NAND", IMX8MN_ICM_NAND, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC1", IMX8MN_ICM_USDHC1, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC2", IMX8MN_ICM_USDHC2, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC3", IMX8MN_ICM_USDHC3, IMX8MN_ICN_MAIN),
+	DEFINE_BUS_INTERCONNECT("PL301_MAIN", IMX8MN_ICN_MAIN, NULL,
+			IMX8MN_ICN_NOC, IMX8MN_ICS_OCRAM),
+};
+
+static int imx8mn_icc_probe(struct platform_device *pdev)
+{
+	return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
+}
+
+static int imx8mn_icc_remove(struct platform_device *pdev)
+{
+	return imx_icc_unregister(pdev);
+}
+
+static struct platform_driver imx8mn_icc_driver = {
+	.probe = imx8mn_icc_probe,
+	.remove = imx8mn_icc_remove,
+	.driver = {
+		.name = "imx8mn-interconnect",
+	},
+};
+
+module_platform_driver(imx8mn_icc_driver);
+MODULE_AUTHOR("Leonard Crestez <leonard.crestez@nxp.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/dt-bindings/interconnect/imx8mn.h b/include/dt-bindings/interconnect/imx8mn.h
new file mode 100644
index 000000000000..03d099dd71f8
--- /dev/null
+++ b/include/dt-bindings/interconnect/imx8mn.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Interconnect framework driver for i.MX SoC
+ *
+ * Copyright (c) 2019, NXP
+ */
+
+#ifndef __IMX8MN_ICM_INTERCONNECT_IDS_H
+#define __IMX8MN_ICM_INTERCONNECT_IDS_H
+
+#define IMX8MN_ICN_NOC		1
+#define IMX8MN_ICS_DRAM		2
+#define IMX8MN_ICS_OCRAM	3
+#define IMX8MN_ICM_A53		4
+
+#define IMX8MN_ICM_GPU		5
+#define IMX8MN_ICN_GPU		6
+
+#define IMX8MN_ICM_CSI1		7
+#define IMX8MN_ICM_CSI2		8
+#define IMX8MN_ICM_ISI		9
+#define IMX8MN_ICM_LCDIF	10
+#define IMX8MN_ICN_MIPI		11
+
+#define IMX8MN_ICM_USB		12
+
+#define IMX8MN_ICM_SDMA2	13
+#define IMX8MN_ICM_SDMA3	14
+#define IMX8MN_ICN_AUDIO	15
+
+#define IMX8MN_ICN_ENET		16
+#define IMX8MN_ICM_ENET		17
+
+#define IMX8MN_ICM_NAND		18
+#define IMX8MN_ICM_SDMA1	19
+#define IMX8MN_ICM_USDHC1	20
+#define IMX8MN_ICM_USDHC2	21
+#define IMX8MN_ICM_USDHC3	22
+#define IMX8MN_ICN_MAIN		23
+
+#endif /* __IMX8MN_ICM_INTERCONNECT_IDS_H */
-- 
2.17.1