linux-kernel - [PATCH v3 0/8] irqchip/stm32-exti: split MCU and MPU code, allow module build

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Message-ID: <20240620083115.204362-1-antonio.borneo@foss.st.com>
Date: Thu, 20 Jun 2024 10:31:07 +0200
From: Antonio Borneo <antonio.borneo@...s.st.com>
To: Russell King <linux@...linux.org.uk>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Thomas Gleixner <tglx@...utronix.de>
CC: Antonio Borneo <antonio.borneo@...s.st.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 0/8] irqchip/stm32-exti: split MCU and MPU code, allow module build

The file 'irq-stm32-exti.c' contains two drivers:
- EXTI for ARMv7m STM32 MCUs;
- EXTI for ARMv7a & ARMv8a STM32MPxxx MPUs.

The current arrangement causes some issue:
- the growing code for MPUs uses precious space on memory constraint
  MCUs devices;
- the driver for MPU cannot be built as module;
- there are risks to break one of the two drivers while working on
  the other.

Since there are only 4 minor functions shared among the two drivers:
- stm32_exti_set_type();
- stm32_chip_resume();
- stm32_chip_suspend();
- stm32_exti_chip_init();

this series splits the file in two independent files, each containing
a single driver.
To guarantee bisect-ability, the series first introduces some hook in
Kconfig, then splits the file and at the end enables module build on
MPU while cleaning-up Kconfig.
The symbols in the MPU file are renamed to better match the new name
of the driver.

The patches are created with 'git format-patch -C' to correctly show
the deleted parts and the tiny modifications between the original
monolithic file and the two extracted ones.

The series is rebased on irq/core branch of tip as it depends on a
previous series already queued for v6.10 merge window.


v1 -> v2
- fix module dependency from IRQ_DOMAIN_HIERARCHY, detected by kernel
  test robot <lkp@...el.com>

v2 -> v3
- rebase on v6.10-rc1, fixing one conflict

Antonio Borneo (8):
  irqchip/stm32-exti: add CONFIG_STM32MP_EXTI
  ARM: stm32: use different EXTI driver on ARMv7m and ARMv7a
  arm64: Kconfig: select STM32MP_EXTI on STM32 platforms
  irqchip/stm32-exti: split MCU and MPU code
  irqchip/stm32mp-exti: rename internal symbols
  irqchip/stm32mp-exti: allow build as module
  ARM: stm32: allow build irq-stm32mp-exti driver as module
  arm64: Kconfig: allow build irq-stm32mp-exti driver as module

 arch/arm/mach-stm32/Kconfig        |   2 +-
 arch/arm64/Kconfig.platforms       |   1 -
 drivers/irqchip/Kconfig            |   9 +
 drivers/irqchip/Makefile           |   1 +
 drivers/irqchip/irq-stm32-exti.c   | 670 +-------------------------
 drivers/irqchip/irq-stm32mp-exti.c | 737 +++++++++++++++++++++++++++++
 6 files changed, 752 insertions(+), 668 deletions(-)
 create mode 100644 drivers/irqchip/irq-stm32mp-exti.c


base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
-- 
2.34.1