linux-kernel - [PATCH v2 0/6] iommu/exynos: Convert to a module

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Date:   Thu,  3 Nov 2022 20:51:48 +0100
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        David Virag <virag.david003@...il.com>, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH v2 0/6] iommu/exynos: Convert to a module

As exynos-iommu driver is not a critical platform driver, it can be
converted to a loadable module to avoid loading it on non-Exynos
platforms in order to improve the RAM footprint. This patch series
converts it to a module and does some related cleanups. IOMMU/DMA
specifics were taken into the account, so remove/exit methods weren't
added.

There are two drivers using CONFIG_EXYNOS_IOMMU in their code:
DRM_EXYNOS and S5P_MFC. Both were checked, and only a slight change was
needed for S5P_MFC driver (patch #6).

Changes in v2:
  - Extracted the "shutdown" method addition into a separate patch
  - Added MODULE_DEVICE_TABLE(of, ...) to support hot-plug loading
  - Added MODULE_ALIAS("platform:exynos-sysmmu")
  - Added fix for S5P_MFC driver to work correctly with EXYNOS_IOMMU=m
  - Fixed checkpatch coding style suggestion with "--strict" flag
  - Rebased on top of most recent joro/iommu.git:next

Sam Protsenko (6):
  iommu: Export iommu_group_default_domain() API
  iommu/exynos: Fix retval on getting clocks in probe
  iommu/exynos: Modularize the driver
  iommu/exynos: Implement shutdown driver method
  iommu/exynos: Rearrange the platform driver code
  media: platform: Use IS_ENABLED() to check EXYNOS_IOMMU in s5p_mfc

 drivers/iommu/Kconfig                         |   2 +-
 drivers/iommu/exynos-iommu.c                  | 355 +++++++++---------
 drivers/iommu/iommu.c                         |   1 +
 .../platform/samsung/s5p-mfc/s5p_mfc_iommu.h  |   4 +-
 4 files changed, 191 insertions(+), 171 deletions(-)

-- 
2.35.1