Messages in this thread | | | Subject | Re: [PATCH V2 3/9] ARM: stm32: prepare stm32 family to welcome armv7 architecture | From | Alexandre Torgue <> | Date | Tue, 19 Dec 2017 15:38:38 +0100 |
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On 12/18/2017 09:24 PM, Arnd Bergmann wrote: > On Mon, Dec 18, 2017 at 4:17 PM, Ludovic Barre <ludovic.Barre@st.com> wrote: >> From: Ludovic Barre <ludovic.barre@st.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 >> ARM_SINGLE_ARMV7M or ARCH_MULTI_V7 flag. >> >> Signed-off-by: Ludovic Barre <ludovic.barre@st.com> > > Looks good overall. Two more small comments: > > >> >> +if ARCH_STM32 >> + >> config MACH_STM32F429 >> - bool "STMicrolectronics STM32F429" >> - depends on ARCH_STM32 >> + bool "STMicroelectronics STM32F429" >> + depends on ARM_SINGLE_ARMV7M >> default y > > Instead of the explicit dependency for each board, I'd leave the surrounding > 'if ARM_SINGLE_ARMV7M'. I think you had in v1. > >> diff --git a/arch/arm/mach-stm32/Makefile b/arch/arm/mach-stm32/Makefile >> index bd0b7b5..5940af1 100644 >> --- a/arch/arm/mach-stm32/Makefile >> +++ b/arch/arm/mach-stm32/Makefile >> @@ -1 +1 @@ >> -obj-y += board-dt.o >> +obj-$(CONFIG_ARM_SINGLE_ARMV7M) += 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 > > Why the rename? I don't expect the new machines to have any notable > contents in a board file, if any at all, so just use one file for both. > I see the board-dt.c file refers to armv7m_restart, we can either put > that in an #ifdef, or find a way to make it the default for all armv7-m > platforms that don't provide any other restart method. > Currently "restart" is not functional on stm32 MCU (at least for stm32f746, I will check on others MCU). My fear is if Ludovic made some patches to make "armv7m_restart" the default ".restart" function for all armv7-m platform, he will not be able to test it on stm32 MCU (as it is not currently working). I propose to do it in 2 steps:
1-Keep as you suggest only one board-dt.c file for both (MCU and MPU) and remove ".restart" function.
2-Investigate and send patches around ".restart" for both in an other series.
regards Alex
> Arnd >
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