[PATCH v1] ARM: imx: add imx7d-m4

[Oleksij Rempel]

Provide basic support for Cortex-M4 located on NXP iMX7D.
This code was tested in combination with imx-rproc driver
which will upload with specially formatted ELF image containing
kernel, device and CPIO rootfs.

Signed-off-by: Oleksij Rempel <o.rempel at pengutronix.de>
---
 arch/arm/boot/dts/Makefile         |  2 +-
 arch/arm/mach-imx/Kconfig          | 33 +++++++++++++++++++++------------
 arch/arm/mach-imx/Makefile         |  3 ++-
 arch/arm/mach-imx/mach-imx7d-cm4.c | 21 +++++++++++++++++++++
 4 files changed, 45 insertions(+), 14 deletions(-)
 create mode 100644 arch/arm/mach-imx/mach-imx7d-cm4.c

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 852452515bea..d49bb9a58aee 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -527,7 +527,7 @@ dtb-$(CONFIG_SOC_IMX6UL) += \
 	imx6ul-tx6ul-0011.dtb \
 	imx6ul-tx6ul-mainboard.dtb \
 	imx6ull-14x14-evk.dtb
-dtb-$(CONFIG_SOC_IMX7D) += \
+dtb-$(CONFIG_SOC_IMX7D_CA7) += \
 	imx7d-cl-som-imx7.dtb \
 	imx7d-colibri-emmc-eval-v3.dtb \
 	imx7d-colibri-eval-v3.dtb \
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 782699e67600..101c8599d952 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -528,18 +528,6 @@ config SOC_IMX6UL
 	help
 	  This enables support for Freescale i.MX6 UltraLite processor.
 
-config SOC_IMX7D
-	bool "i.MX7 Dual support"
-	select PINCTRL_IMX7D
-	select ARM_GIC
-	select HAVE_ARM_ARCH_TIMER
-	select HAVE_IMX_ANATOP
-	select HAVE_IMX_MMDC
-	select HAVE_IMX_SRC
-	select IMX_GPCV2
-	help
-		This enables support for Freescale i.MX7 Dual processor.
-
 config SOC_LS1021A
 	bool "Freescale LS1021A support"
 	select ARM_GIC
@@ -554,6 +542,27 @@ comment "Cortex-A/Cortex-M asymmetric multiprocessing platforms"
 
 if ARCH_MULTI_V7 || ARM_SINGLE_ARMV7M
 
+config SOC_IMX7D_CA7
+	bool
+	select ARM_GIC
+	select HAVE_ARM_ARCH_TIMER
+	select HAVE_IMX_ANATOP
+	select HAVE_IMX_MMDC
+	select HAVE_IMX_SRC
+	select IMX_GPCV2
+
+config SOC_IMX7D_CM4
+	bool
+	select ARMV7M_SYSTICK
+
+config SOC_IMX7D
+	bool "i.MX7 Dual support"
+	select PINCTRL_IMX7D
+	select SOC_IMX7D_CA7 if ARCH_MULTI_V7
+	select SOC_IMX7D_CM4 if ARM_SINGLE_ARMV7M
+	help
+		This enables support for Freescale i.MX7 Dual processor.
+
 config SOC_VF610
 	bool "Vybrid Family VF610 support"
 	select ARM_GIC if ARCH_MULTI_V7
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 8ff71058207d..68640f100ef3 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -80,7 +80,8 @@ obj-$(CONFIG_SOC_IMX6Q) += mach-imx6q.o
 obj-$(CONFIG_SOC_IMX6SL) += mach-imx6sl.o
 obj-$(CONFIG_SOC_IMX6SX) += mach-imx6sx.o
 obj-$(CONFIG_SOC_IMX6UL) += mach-imx6ul.o
-obj-$(CONFIG_SOC_IMX7D) += mach-imx7d.o
+obj-$(CONFIG_SOC_IMX7D_CA7) += mach-imx7d.o
+obj-$(CONFIG_SOC_IMX7D_CM4) += mach-imx7d-cm4.o
 
 ifeq ($(CONFIG_SUSPEND),y)
 AFLAGS_suspend-imx6.o :=-Wa,-march=armv7-a
diff --git a/arch/arm/mach-imx/mach-imx7d-cm4.c b/arch/arm/mach-imx/mach-imx7d-cm4.c
new file mode 100644
index 000000000000..c36dea79aeb8
--- /dev/null
+++ b/arch/arm/mach-imx/mach-imx7d-cm4.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright 2017 Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <asm/v7m.h>
+#include <asm/mach/arch.h>
+
+static const char * const imx7d_cm4_dt_compat[] __initconst = {
+	"fsl,imx7d-cm4",
+	NULL,
+};
+
+DT_MACHINE_START(IMX7D, "Freescale i.MX7 Dual Cortex-M4 (Device Tree)")
+	.dt_compat = imx7d_cm4_dt_compat,
+	.restart = armv7m_restart,
+MACHINE_END
-- 
2.16.1