From: Chunyan Zhang <chunyan.zhang@xxxxxxxxxx> Changes since v4 (https://lkml.org/lkml/2021/2/4/85): * Rebased on v5.12-rc1; * Dropped using syscon node for mapping registers according to Rob's comments. Changes since v3 (https://lkml.org/lkml/2021/2/3/161): * Rebased on iommu/next, and fixed compile error reported by kernel test robot <lkp@xxxxxxxxx>; * %s/iommu/IOMMU/ properly in the whole patchset. Changes since v2 (https://lkml.org/lkml/2021/2/2/106): * Added a WARN and return 0 if an invalid iova was passed to sprd_iommu_iova_to_phys(); * Changed the name of sprd_iommu_write(); * Revised CONFIG_SPRD_IOMMU help graph in Kconfig. * Revised comments for the struct sprd_iommu_device; * Converted to use "GPL" instread of "GPL v2", they are same as license-rules.rst shows. Changes since v1 (https://lkml.org/lkml/2021/1/21/563): * Fixed compile errors reported by kernel test robot <lkp@xxxxxxxxx>. * Changed to use syscon to get mapped registers for iommu and media devices to avoid double map issue. * Addressed Robin's comments: - Added including offset in the returned physical address if the input virtual address isn't page-aligned; - Added platform_device_put() after calling of_find_device_by_node(); - Removed iommu register offset from driver, it will be defined as the cell of DT reference to syscon phandle; - Removed multi compatible strings which are not needed; - Added comments for the function sprd_iommu_clk_enable(); - Added clocks property in bindings; - Set device_driver.suppress_bind_attrs to disable unbind the devices via sysfs; - A few trivial fixes. Changes since RFC v2 (https://lkml.org/lkml/2021/1/8/277): * Addressed Robin's comments: - Add COMPILE_TEST support; - Use DMA allocator for PTE; - Revised to avoid resource leak issue; - Added ->iotlb_sync implemented; - Moved iommu group allocation to probe; - Changed some function names to make them sprd specific; * Added support for more iommu instance; Changes since RFC v1 (https://lkml.org/lkml/2020/12/23/209): * Rebased on v5.11-rc1; * Changed sprd-iommu to tristate; * Removed check for args_count of iommu OF node, since there's no args for sprd-iommu device node; * Added another IP version (i.e. vau); * Removed unnecessary configs selection from CONFIG_SPRD_IOMMU; * Changed to get zeroed pages. Chunyan Zhang (2): dt-bindings: iommu: add bindings for sprd IOMMU iommu: add Unisoc IOMMU basic driver .../devicetree/bindings/iommu/sprd,iommu.yaml | 57 ++ drivers/iommu/Kconfig | 12 + drivers/iommu/Makefile | 1 + drivers/iommu/sprd-iommu.c | 577 ++++++++++++++++++ 4 files changed, 647 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/sprd,iommu.yaml create mode 100644 drivers/iommu/sprd-iommu.c -- 2.25.1
