[PATCH 2/6] ARM: stm32: add initial support for STM32MP157

[Ludovic Barre]

From: Ludovic Barre <ludovic.barre at st.com>

This patch adds initial support of STM32MP157 microprocessor (MPU)
based on Arm Cortex-A7. Under new ARCH_STM32_MPU flag we select the
needed Cortex-A infrastructure (like gic, timer,...)

Signed-off-by: Ludovic Barre <ludovic.barre at st.com>
---
 Documentation/arm/stm32/stm32mp157-overview.txt | 12 ++++++++++++
 Documentation/devicetree/bindings/arm/stm32.txt |  1 +
 arch/arm/mach-stm32/Kconfig                     | 22 ++++++++++++++++++++--
 arch/arm/mach-stm32/Makefile                    |  1 +
 arch/arm/mach-stm32/board-mpu-dt.c              | 16 ++++++++++++++++
 5 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/arm/stm32/stm32mp157-overview.txt
 create mode 100644 arch/arm/mach-stm32/board-mpu-dt.c

diff --git a/Documentation/arm/stm32/stm32mp157-overview.txt b/Documentation/arm/stm32/stm32mp157-overview.txt
new file mode 100644
index 0000000..8a3e7cb
--- /dev/null
+++ b/Documentation/arm/stm32/stm32mp157-overview.txt
@@ -0,0 +1,12 @@
+			STM32MP157 Overview
+			===================
+
+  Introduction
+  ------------
+	The STM32MP157 is a Cortex-A MPU aimed at various applications.
+	It features:
+	- Dual core Cortex-A7 application core
+	- 2D/3D image composition with GPU
+	- Standard memories interface support
+	- Standard connectivity, widely inherited from the STM32 MCU family
+	- Comprehensive security support
diff --git a/Documentation/devicetree/bindings/arm/stm32.txt b/Documentation/devicetree/bindings/arm/stm32.txt
index 05762b0..6808ed9 100644
--- a/Documentation/devicetree/bindings/arm/stm32.txt
+++ b/Documentation/devicetree/bindings/arm/stm32.txt
@@ -7,3 +7,4 @@ using one of the following compatible strings:
   st,stm32f469
   st,stm32f746
   st,stm32h743
+  st,stm32mp157
diff --git a/arch/arm/mach-stm32/Kconfig b/arch/arm/mach-stm32/Kconfig
index c8059ea..2b227c7 100644
--- a/arch/arm/mach-stm32/Kconfig
+++ b/arch/arm/mach-stm32/Kconfig
@@ -1,12 +1,12 @@
 menuconfig ARCH_STM32
-	bool "STMicrolectronics STM32 family" if ARM_SINGLE_ARMV7M
+	bool "STMicrolectronics STM32 family" if ARM_SINGLE_ARMV7M || ARCH_MULTI_V7
 	select ARCH_HAS_RESET_CONTROLLER
 	select CLKSRC_STM32
 	select PINCTRL
 	select RESET_CONTROLLER
 	select STM32_EXTI
 	help
-	  Support for STMicroelectronics STM32 MCU family
+	  Support for STMicroelectronics STM32 MCU/MPU family
 
 if ARCH_STM32
 
@@ -40,4 +40,22 @@ config MACH_STM32H743
 
 endif
 
+if ARCH_MULTI_V7
+
+config ARCH_STM32_MPU
+	bool "STMicrolectronics STM32 MPU"
+	default y
+	select ARM_GIC
+	select HAVE_ARM_ARCH_TIMER
+	select ARM_PSCI
+	help
+	  Support for STMicroelectronics STM32 Microprocessors.
+
+config MACH_STM32MP157
+	bool "STMicrolectronics STM32MP157"
+	depends on ARCH_STM32_MPU
+	default y
+
+endif
+
 endif
diff --git a/arch/arm/mach-stm32/Makefile b/arch/arm/mach-stm32/Makefile
index 90c1b71..a405eb6 100644
--- a/arch/arm/mach-stm32/Makefile
+++ b/arch/arm/mach-stm32/Makefile
@@ -1 +1,2 @@
 obj-$(CONFIG_ARCH_STM32_MCU) += board-mcu-dt.o
+obj-$(CONFIG_ARCH_STM32_MPU) += board-mpu-dt.o
diff --git a/arch/arm/mach-stm32/board-mpu-dt.c b/arch/arm/mach-stm32/board-mpu-dt.c
new file mode 100644
index 0000000..9e18405
--- /dev/null
+++ b/arch/arm/mach-stm32/board-mpu-dt.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2017 - All Rights Reserved
+ * Author: Ludovic Barre <ludovic.barre at st.com> for STMicroelectronics.
+ */
+#include <asm/mach/arch.h>
+#include <linux/of_platform.h>
+
+static const char *const stm32mp_compat[] __initconst = {
+	"st,stm32mp157",
+	NULL
+};
+
+DT_MACHINE_START(STM32MPDT, "STM32 MP (Device Tree Support)")
+	.dt_compat = stm32mp_compat,
+MACHINE_END
-- 
2.7.4