linux-kernel - Re: [PATCH V2 3/9] ARM: stm32: prepare stm32 family to welcome armv7 architecture

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Message-ID: <CAK8P3a1WzkVQ3591XjVQPLCqP0_zZ4ksqJqWvm7de_OnkE3oaQ@mail.gmail.com>
Date:   Mon, 18 Dec 2017 21:24:45 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ludovic Barre <ludovic.Barre@...com>
Cc:     Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Gerald Baeza <gerald.baeza@...com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH V2 3/9] ARM: stm32: prepare stm32 family to welcome armv7 architecture

On Mon, Dec 18, 2017 at 4:17 PM, Ludovic Barre <ludovic.Barre@...com> wrote:
> 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
> ARM_SINGLE_ARMV7M or ARCH_MULTI_V7 flag.
>
> Signed-off-by: Ludovic Barre <ludovic.barre@...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.

     Arnd