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    SubjectRe: [PATCH v6 00/12] iommu/exynos: Fixes and Enhancements of System MMU driver with DT
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    On Wed, Jan 16, 2013 at 7:53 PM, Will Deacon <will.deacon@arm.com> wrote:
    > On Wed, Dec 26, 2012 at 01:53:15AM +0000, Cho KyongHo wrote:
    >> notice: v6 patch-set is rebased on next/iommu-exynos branch of
    >> linux-samsung.git. This patch-set does not include 2 patches (05 and 06
    >> patches in v5 patch-se) because they alread exist already in the branch.
    >
    > Given that devicetree-discuss has been notably absent from discussion
    > surrounding the proposed binding, I think that including that patch in
    > linux-samsung.git and dropping it from this series is rather premature.
    >
    > I have comments on the binding, so I'll dig up the version you posted in v5
    > and add devicetree-discuss to CC.

    Thank you.

    >> The current exynos-iommu(System MMU) driver does not work autonomously
    >> since it is lack of support for power management of peripheral blocks.
    >> For example, MFC device driver must ensure that its System MMU is disabled
    >> before MFC block is power-down not to invalidate IOTLB in the System MMU
    >> when I/O memory mapping is changed. Because A System MMU is resides in the
    >> same H/W block, access to control registers of System MMU while the H/W
    >> block is turned off must be prohibited.
    >>
    >> This set of changes solves the above problem with setting each System MMUs
    >> as the parent of the device which owns the System MMU to recieve the
    >> information when the device is turned off or turned on.
    >>
    >> Another big change to the driver is the support for devicetree.
    >> The bindings for System MMU is described in
    >> Documentation/devicetree/bindings/arm/samsung/system-mmu.txt
    >
    > This should probably be Documentation/devicetree/bindings/iommu/ no?

    Please let me check it.

    Thank you.

    KyongHo.


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