linux-kernel - [PATCH 1/6] ARM: stm32: prepare stm32 family to welcome armv7 architecture

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Message-ID: <1512742277-28205-2-git-send-email-ludovic.Barre@st.com>
Date:   Fri, 8 Dec 2017 15:11:12 +0100
From:   Ludovic Barre <ludovic.Barre@...com>
To:     Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
CC:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Ludovic Barre <ludovic.barre@...com>
Subject: [PATCH 1/6] ARM: stm32: prepare stm32 family to welcome armv7 architecture

From: Ludovic Barre <ludovic.barre@...com>

This patch prepares the STM32 machine for the integration of Cortex-A
based microprocessor (MPU), on top of the existing Cortex-M
microcontroller family (MCU). Since both MCUs and MPUs are sharing
common hardware blocks we can keep using ARCH_STM32 flag for most of
them. If a hardware block is specific to one family we can use either
ARCH_STM32_MCU or ARCH_STM32_MPU flag.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
---
 Documentation/arm/stm32/overview.txt               | 21 +++++++--------
 arch/arm/mach-stm32/Kconfig                        | 30 +++++++++++++++-------
 arch/arm/mach-stm32/Makefile                       |  2 +-
 arch/arm/mach-stm32/{board-dt.c => board-mcu-dt.c} |  0
 4 files changed, 33 insertions(+), 20 deletions(-)
 rename arch/arm/mach-stm32/{board-dt.c => board-mcu-dt.c} (100%)

diff --git a/Documentation/arm/stm32/overview.txt b/Documentation/arm/stm32/overview.txt
index a03b035..384cc7f 100644
--- a/Documentation/arm/stm32/overview.txt
+++ b/Documentation/arm/stm32/overview.txt
@@ -4,17 +4,17 @@
 Introduction
 ------------
 
-  The STMicroelectronics family of Cortex-M based MCUs are supported by the
-  'STM32' platform of ARM Linux. Currently only the STM32F429 (Cortex-M4)
-  and STM32F746 (Cortex-M7) are supported.
-
+  The STMicroelectronics STM32 family of Cortex-A microprocessors (MPUs) and
+  Cortex-M microcontrollers (MCUs) are supported by the 'STM32' platform of
+  ARM Linux.
 
 Configuration
 -------------
 
-  A generic configuration is provided for STM32 family, and can be used as the
-  default by
+  For MCUs, use the provided default configuration:
 	make stm32_defconfig
+  For MPUs, use multi_v7 configuration:
+	make multi_v7_defconfig
 
 Layout
 ------
@@ -22,12 +22,13 @@ Layout
   All the files for multiple machine families are located in the platform code
   contained in arch/arm/mach-stm32
 
-  There is a generic board board-dt.c in the mach folder which support
-  Flattened Device Tree, which means, it works with any compatible board with
-  Device Trees.
-
+  There are generic boards board-mcu-dt.c and board-mpu-dt.c files in the mach
+  folder which support Flattened Device Tree, which means, they work with any
+  compatible board with Device Trees.
 
 Document Author
 ---------------
 
   Maxime Coquelin <mcoquelin.stm32@...il.com>
+  Ludovic Barre <ludovic.barre@...com>
+  Gerald Baeza <gerald.baeza@...com>
diff --git a/arch/arm/mach-stm32/Kconfig b/arch/arm/mach-stm32/Kconfig
index 0d1889b..c8059ea 100644
--- a/arch/arm/mach-stm32/Kconfig
+++ b/arch/arm/mach-stm32/Kconfig
@@ -1,31 +1,43 @@
-config ARCH_STM32
-	bool "STMicrolectronics STM32"
-	depends on ARM_SINGLE_ARMV7M
+menuconfig ARCH_STM32
+	bool "STMicrolectronics STM32 family" if ARM_SINGLE_ARMV7M
 	select ARCH_HAS_RESET_CONTROLLER
-	select ARMV7M_SYSTICK
 	select CLKSRC_STM32
 	select PINCTRL
 	select RESET_CONTROLLER
 	select STM32_EXTI
 	help
-	  Support for STMicroelectronics STM32 processors.
+	  Support for STMicroelectronics STM32 MCU family
+
+if ARCH_STM32
+
+if ARM_SINGLE_ARMV7M
+
+config ARCH_STM32_MCU
+	bool "STMicrolectronics STM32 MCU"
+	select ARMV7M_SYSTICK
+	help
+	  Support for STMicroelectronics STM32 Microcontrollers.
 
 config MACH_STM32F429
 	bool "STMicrolectronics STM32F429"
-	depends on ARCH_STM32
+	depends on ARCH_STM32_MCU
 	default y
 
 config MACH_STM32F469
 	bool "STMicrolectronics STM32F469"
-	depends on ARCH_STM32
+	depends on ARCH_STM32_MCU
 	default y
 
 config MACH_STM32F746
 	bool "STMicrolectronics STM32F746"
-	depends on ARCH_STM32
+	depends on ARCH_STM32_MCU
 	default y
 
 config MACH_STM32H743
 	bool "STMicrolectronics STM32H743"
-	depends on ARCH_STM32
+	depends on ARCH_STM32_MCU
 	default y
+
+endif
+
+endif
diff --git a/arch/arm/mach-stm32/Makefile b/arch/arm/mach-stm32/Makefile
index bd0b7b5..90c1b71 100644
--- a/arch/arm/mach-stm32/Makefile
+++ b/arch/arm/mach-stm32/Makefile
@@ -1 +1 @@
-obj-y += board-dt.o
+obj-$(CONFIG_ARCH_STM32_MCU) += board-mcu-dt.o
diff --git a/arch/arm/mach-stm32/board-dt.c b/arch/arm/mach-stm32/board-mcu-dt.c
similarity index 100%
rename from arch/arm/mach-stm32/board-dt.c
rename to arch/arm/mach-stm32/board-mcu-dt.c
-- 
2.7.4