interconnect: imx: Add platform driver for imx8mq

Add a platform driver for the i.MX8MQ SoC describing bus topology,
based on internal documentation.

Signed-off-by: Leonard Crestez <[e-mail]>
Tested-by: Martin Kepplinger <[e-mail]>
Link: https://lore.kernel.org/r/864310d[e-mail]
Signed-off-by: Georgi Djakov <[e-mail]>

drivers/interconnect/imx/Kconfig

···
 config INTERCONNECT_IMX8MM
 	tristate "i.MX8MM interconnect driver"
 	depends on INTERCONNECT_IMX
+
+config INTERCONNECT_IMX8MQ
+	tristate "i.MX8MQ interconnect driver"
+	depends on INTERCONNECT_IMX

drivers/interconnect/imx/Makefile

···
 imx-interconnect-objs			:= imx.o
 imx8mm-interconnect-objs       		:= imx8mm.o
+imx8mq-interconnect-objs       		:= imx8mq.o
 
 obj-$(CONFIG_INTERCONNECT_IMX)		+= imx-interconnect.o
 obj-$(CONFIG_INTERCONNECT_IMX8MM)	+= imx8mm-interconnect.o
+obj-$(CONFIG_INTERCONNECT_IMX8MQ)	+= imx8mq-interconnect.o

drivers/interconnect/imx/imx8mq.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Interconnect framework driver for i.MX8MQ SoC
+ *
+ * Copyright (c) 2019-2020, NXP
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/interconnect/imx8mq.h>
+
+#include "imx.h"
+
+static const struct imx_icc_node_adj_desc imx8mq_dram_adj = {
+	.bw_mul = 1,
+	.bw_div = 4,
+	.phandle_name = "fsl,ddrc",
+};
+
+static const struct imx_icc_node_adj_desc imx8mq_noc_adj = {
+	.bw_mul = 1,
+	.bw_div = 4,
+	.main_noc = true,
+};
+
+/*
+ * 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", IMX8MQ_ICN_NOC, &imx8mq_noc_adj,
+			IMX8MQ_ICS_DRAM, IMX8MQ_ICN_MAIN),
+
+	DEFINE_BUS_SLAVE("DRAM", IMX8MQ_ICS_DRAM, &imx8mq_dram_adj),
+	DEFINE_BUS_SLAVE("OCRAM", IMX8MQ_ICS_OCRAM, NULL),
+	DEFINE_BUS_MASTER("A53", IMX8MQ_ICM_A53, IMX8MQ_ICN_NOC),
+
+	/* VPUMIX */
+	DEFINE_BUS_MASTER("VPU", IMX8MQ_ICM_VPU, IMX8MQ_ICN_VIDEO),
+	DEFINE_BUS_INTERCONNECT("PL301_VIDEO", IMX8MQ_ICN_VIDEO, NULL, IMX8MQ_ICN_NOC),
+
+	/* GPUMIX */
+	DEFINE_BUS_MASTER("GPU", IMX8MQ_ICM_GPU, IMX8MQ_ICN_GPU),
+	DEFINE_BUS_INTERCONNECT("PL301_GPU", IMX8MQ_ICN_GPU, NULL, IMX8MQ_ICN_NOC),
+
+	/* DISPMIX (only for DCSS) */
+	DEFINE_BUS_MASTER("DC", IMX8MQ_ICM_DCSS, IMX8MQ_ICN_DCSS),
+	DEFINE_BUS_INTERCONNECT("PL301_DC", IMX8MQ_ICN_DCSS, NULL, IMX8MQ_ICN_NOC),
+
+	/* USBMIX */
+	DEFINE_BUS_MASTER("USB1", IMX8MQ_ICM_USB1, IMX8MQ_ICN_USB),
+	DEFINE_BUS_MASTER("USB2", IMX8MQ_ICM_USB2, IMX8MQ_ICN_USB),
+	DEFINE_BUS_INTERCONNECT("PL301_USB", IMX8MQ_ICN_USB, NULL, IMX8MQ_ICN_NOC),
+
+	/* PL301_DISPLAY (IPs other than DCSS, inside SUPERMIX) */
+	DEFINE_BUS_MASTER("CSI1", IMX8MQ_ICM_CSI1, IMX8MQ_ICN_DISPLAY),
+	DEFINE_BUS_MASTER("CSI2", IMX8MQ_ICM_CSI2, IMX8MQ_ICN_DISPLAY),
+	DEFINE_BUS_MASTER("LCDIF", IMX8MQ_ICM_LCDIF, IMX8MQ_ICN_DISPLAY),
+	DEFINE_BUS_INTERCONNECT("PL301_DISPLAY", IMX8MQ_ICN_DISPLAY, NULL, IMX8MQ_ICN_MAIN),
+
+	/* AUDIO */
+	DEFINE_BUS_MASTER("SDMA2", IMX8MQ_ICM_SDMA2, IMX8MQ_ICN_AUDIO),
+	DEFINE_BUS_INTERCONNECT("PL301_AUDIO", IMX8MQ_ICN_AUDIO, NULL, IMX8MQ_ICN_DISPLAY),
+
+	/* ENET */
+	DEFINE_BUS_MASTER("ENET", IMX8MQ_ICM_ENET, IMX8MQ_ICN_ENET),
+	DEFINE_BUS_INTERCONNECT("PL301_ENET", IMX8MQ_ICN_ENET, NULL, IMX8MQ_ICN_MAIN),
+
+	/* OTHER */
+	DEFINE_BUS_MASTER("SDMA1", IMX8MQ_ICM_SDMA1, IMX8MQ_ICN_MAIN),
+	DEFINE_BUS_MASTER("NAND", IMX8MQ_ICM_NAND, IMX8MQ_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC1", IMX8MQ_ICM_USDHC1, IMX8MQ_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC2", IMX8MQ_ICM_USDHC2, IMX8MQ_ICN_MAIN),
+	DEFINE_BUS_MASTER("PCIE1", IMX8MQ_ICM_PCIE1, IMX8MQ_ICN_MAIN),
+	DEFINE_BUS_MASTER("PCIE2", IMX8MQ_ICM_PCIE2, IMX8MQ_ICN_MAIN),
+	DEFINE_BUS_INTERCONNECT("PL301_MAIN", IMX8MQ_ICN_MAIN, NULL,
+			IMX8MQ_ICN_NOC, IMX8MQ_ICS_OCRAM),
+};
+
+static int imx8mq_icc_probe(struct platform_device *pdev)
+{
+	return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
+}
+
+static int imx8mq_icc_remove(struct platform_device *pdev)
+{
+	return imx_icc_unregister(pdev);
+}
+
+static struct platform_driver imx8mq_icc_driver = {
+	.probe = imx8mq_icc_probe,
+	.remove = imx8mq_icc_remove,
+	.driver = {
+		.name = "imx8mq-interconnect",
+	},
+};
+
+module_platform_driver(imx8mq_icc_driver);
+MODULE_ALIAS("platform:imx8mq-interconnect");
+MODULE_AUTHOR("Leonard Crestez <[e-mail]>");
+MODULE_LICENSE("GPL v2");

include/dt-bindings/interconnect/imx8mq.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Interconnect framework driver for i.MX SoC
+ *
+ * Copyright (c) 2019-2020, NXP
+ */
+
+#ifndef __DT_BINDINGS_INTERCONNECT_IMX8MQ_H
+#define __DT_BINDINGS_INTERCONNECT_IMX8MQ_H
+
+#define IMX8MQ_ICN_NOC		1
+#define IMX8MQ_ICS_DRAM		2
+#define IMX8MQ_ICS_OCRAM	3
+#define IMX8MQ_ICM_A53		4
+
+#define IMX8MQ_ICM_VPU		5
+#define IMX8MQ_ICN_VIDEO	6
+
+#define IMX8MQ_ICM_GPU		7
+#define IMX8MQ_ICN_GPU		8
+
+#define IMX8MQ_ICM_DCSS		9
+#define IMX8MQ_ICN_DCSS		10
+
+#define IMX8MQ_ICM_USB1		11
+#define IMX8MQ_ICM_USB2		12
+#define IMX8MQ_ICN_USB		13
+
+#define IMX8MQ_ICM_CSI1		14
+#define IMX8MQ_ICM_CSI2		15
+#define IMX8MQ_ICM_LCDIF	16
+#define IMX8MQ_ICN_DISPLAY	17
+
+#define IMX8MQ_ICM_SDMA2	18
+#define IMX8MQ_ICN_AUDIO	19
+
+#define IMX8MQ_ICN_ENET		20
+#define IMX8MQ_ICM_ENET		21
+
+#define IMX8MQ_ICM_SDMA1	22
+#define IMX8MQ_ICM_NAND		23
+#define IMX8MQ_ICM_USDHC1	24
+#define IMX8MQ_ICM_USDHC2	25
+#define IMX8MQ_ICM_PCIE1	26
+#define IMX8MQ_ICM_PCIE2	27
+#define IMX8MQ_ICN_MAIN		28
+
+#endif /* __DT_BINDINGS_INTERCONNECT_IMX8MQ_H */