ARM: imx: Provide support for NXP i.MX7D Cortex-M4

Cortex M4 part can be started from a boot loader or over
Linux remoteproc framework.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

3 files changed, 41 insertions, 13 deletions

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 6f4232384774..abc337111eff 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -523,18 +523,6 @@ 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
@@ -549,6 +537,27 @@ 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 127fdf3ff600..146ebf97b7eb 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -81,7 +81,8 @@ obj-$(CONFIG_SOC_IMX6SL) += mach-imx6sl.o
 obj-$(CONFIG_SOC_IMX6SLL) += 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..0800b5891d2a
--- /dev/null
+++ b/arch/arm/mach-imx/mach-imx7d-cm4.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@pengutronix.de>
+ */
+
+#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