interconnect: imx: Add platform driver for imx8mm

Add a platform driver for the i.MX8MM SoC describing bus topology.

Bandwidth adjustments is currently only supported on the DDRC and main
NOC. Scaling for the vpu/gpu/display NICs could be added in the future.

Signed-off-by: Alexandre Bailon <[e-mail]>
Signed-off-by: Leonard Crestez <[e-mail]>
Link: https://lore.kernel.org/r/b14eef1[e-mail]
Signed-off-by: Georgi Djakov <[e-mail]>

drivers/interconnect/imx/Kconfig

···
 	depends on ARCH_MXC || COMPILE_TEST
 	help
 	  Generic interconnect drivers for i.MX SOCs
+
+config INTERCONNECT_IMX8MM
+	tristate "i.MX8MM interconnect driver"
+	depends on INTERCONNECT_IMX

drivers/interconnect/imx/Makefile

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

drivers/interconnect/imx/imx8mm.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Interconnect framework driver for i.MX8MM SoC
+ *
+ * Copyright (c) 2019, BayLibre
+ * Copyright (c) 2019-2020, NXP
+ * Author: Alexandre Bailon <[e-mail]>
+ * Author: Leonard Crestez <[e-mail]>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/interconnect/imx8mm.h>
+
+#include "imx.h"
+
+static const struct imx_icc_node_adj_desc imx8mm_dram_adj = {
+	.bw_mul = 1,
+	.bw_div = 16,
+	.phandle_name = "fsl,ddrc",
+};
+
+static const struct imx_icc_node_adj_desc imx8mm_noc_adj = {
+	.bw_mul = 1,
+	.bw_div = 16,
+	.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", IMX8MM_ICN_NOC, &imx8mm_noc_adj,
+			IMX8MM_ICS_DRAM, IMX8MM_ICN_MAIN),
+
+	DEFINE_BUS_SLAVE("DRAM", IMX8MM_ICS_DRAM, &imx8mm_dram_adj),
+	DEFINE_BUS_SLAVE("OCRAM", IMX8MM_ICS_OCRAM, NULL),
+	DEFINE_BUS_MASTER("A53", IMX8MM_ICM_A53, IMX8MM_ICN_NOC),
+
+	/* VPUMIX */
+	DEFINE_BUS_MASTER("VPU H1", IMX8MM_ICM_VPU_H1, IMX8MM_ICN_VIDEO),
+	DEFINE_BUS_MASTER("VPU G1", IMX8MM_ICM_VPU_G1, IMX8MM_ICN_VIDEO),
+	DEFINE_BUS_MASTER("VPU G2", IMX8MM_ICM_VPU_G2, IMX8MM_ICN_VIDEO),
+	DEFINE_BUS_INTERCONNECT("PL301_VIDEO", IMX8MM_ICN_VIDEO, NULL, IMX8MM_ICN_NOC),
+
+	/* GPUMIX */
+	DEFINE_BUS_MASTER("GPU 2D", IMX8MM_ICM_GPU2D, IMX8MM_ICN_GPU),
+	DEFINE_BUS_MASTER("GPU 3D", IMX8MM_ICM_GPU3D, IMX8MM_ICN_GPU),
+	DEFINE_BUS_INTERCONNECT("PL301_GPU", IMX8MM_ICN_GPU, NULL, IMX8MM_ICN_NOC),
+
+	/* DISPLAYMIX */
+	DEFINE_BUS_MASTER("CSI", IMX8MM_ICM_CSI, IMX8MM_ICN_MIPI),
+	DEFINE_BUS_MASTER("LCDIF", IMX8MM_ICM_LCDIF, IMX8MM_ICN_MIPI),
+	DEFINE_BUS_INTERCONNECT("PL301_MIPI", IMX8MM_ICN_MIPI, NULL, IMX8MM_ICN_NOC),
+
+	/* HSIO */
+	DEFINE_BUS_MASTER("USB1", IMX8MM_ICM_USB1, IMX8MM_ICN_HSIO),
+	DEFINE_BUS_MASTER("USB2", IMX8MM_ICM_USB2, IMX8MM_ICN_HSIO),
+	DEFINE_BUS_MASTER("PCIE", IMX8MM_ICM_PCIE, IMX8MM_ICN_HSIO),
+	DEFINE_BUS_INTERCONNECT("PL301_HSIO", IMX8MM_ICN_HSIO, NULL, IMX8MM_ICN_NOC),
+
+	/* Audio */
+	DEFINE_BUS_MASTER("SDMA2", IMX8MM_ICM_SDMA2, IMX8MM_ICN_AUDIO),
+	DEFINE_BUS_MASTER("SDMA3", IMX8MM_ICM_SDMA3, IMX8MM_ICN_AUDIO),
+	DEFINE_BUS_INTERCONNECT("PL301_AUDIO", IMX8MM_ICN_AUDIO, NULL, IMX8MM_ICN_MAIN),
+
+	/* Ethernet */
+	DEFINE_BUS_MASTER("ENET", IMX8MM_ICM_ENET, IMX8MM_ICN_ENET),
+	DEFINE_BUS_INTERCONNECT("PL301_ENET", IMX8MM_ICN_ENET, NULL, IMX8MM_ICN_MAIN),
+
+	/* Other */
+	DEFINE_BUS_MASTER("SDMA1", IMX8MM_ICM_SDMA1, IMX8MM_ICN_MAIN),
+	DEFINE_BUS_MASTER("NAND", IMX8MM_ICM_NAND, IMX8MM_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC1", IMX8MM_ICM_USDHC1, IMX8MM_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC2", IMX8MM_ICM_USDHC2, IMX8MM_ICN_MAIN),
+	DEFINE_BUS_MASTER("USDHC3", IMX8MM_ICM_USDHC3, IMX8MM_ICN_MAIN),
+	DEFINE_BUS_INTERCONNECT("PL301_MAIN", IMX8MM_ICN_MAIN, NULL,
+			IMX8MM_ICN_NOC, IMX8MM_ICS_OCRAM),
+};
+
+static int imx8mm_icc_probe(struct platform_device *pdev)
+{
+	return imx_icc_register(pdev, nodes, ARRAY_SIZE(nodes));
+}
+
+static int imx8mm_icc_remove(struct platform_device *pdev)
+{
+	return imx_icc_unregister(pdev);
+}
+
+static struct platform_driver imx8mm_icc_driver = {
+	.probe = imx8mm_icc_probe,
+	.remove = imx8mm_icc_remove,
+	.driver = {
+		.name = "imx8mm-interconnect",
+	},
+};
+
+module_platform_driver(imx8mm_icc_driver);
+MODULE_AUTHOR("Alexandre Bailon <[e-mail]>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:imx8mm-interconnect");

include/dt-bindings/interconnect/imx8mm.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Interconnect framework driver for i.MX SoC
+ *
+ * Copyright (c) 2019, BayLibre
+ * Copyright (c) 2019-2020, NXP
+ * Author: Alexandre Bailon <[e-mail]>
+ */
+
+#ifndef __DT_BINDINGS_INTERCONNECT_IMX8MM_H
+#define __DT_BINDINGS_INTERCONNECT_IMX8MM_H
+
+#define IMX8MM_ICN_NOC		1
+#define IMX8MM_ICS_DRAM		2
+#define IMX8MM_ICS_OCRAM	3
+#define IMX8MM_ICM_A53		4
+
+#define IMX8MM_ICM_VPU_H1	5
+#define IMX8MM_ICM_VPU_G1	6
+#define IMX8MM_ICM_VPU_G2	7
+#define IMX8MM_ICN_VIDEO	8
+
+#define IMX8MM_ICM_GPU2D	9
+#define IMX8MM_ICM_GPU3D	10
+#define IMX8MM_ICN_GPU		11
+
+#define IMX8MM_ICM_CSI		12
+#define IMX8MM_ICM_LCDIF	13
+#define IMX8MM_ICN_MIPI		14
+
+#define IMX8MM_ICM_USB1		15
+#define IMX8MM_ICM_USB2		16
+#define IMX8MM_ICM_PCIE		17
+#define IMX8MM_ICN_HSIO		18
+
+#define IMX8MM_ICM_SDMA2	19
+#define IMX8MM_ICM_SDMA3	20
+#define IMX8MM_ICN_AUDIO	21
+
+#define IMX8MM_ICN_ENET		22
+#define IMX8MM_ICM_ENET		23
+
+#define IMX8MM_ICN_MAIN		24
+#define IMX8MM_ICM_NAND		25
+#define IMX8MM_ICM_SDMA1	26
+#define IMX8MM_ICM_USDHC1	27
+#define IMX8MM_ICM_USDHC2	28
+#define IMX8MM_ICM_USDHC3	29
+
+#endif /* __DT_BINDINGS_INTERCONNECT_IMX8MM_H */