[PATCH v2 0/2] Add Unisoc iommu basic driver

From: Chunyan Zhang <zhang.lyra@gmail.com>
To: Robin Murphy <robin.murphy@arm.com>,
	Rob Herring <robh+dt@kernel.org>, Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
	Baolin Wang <baolin.wang7@gmail.com>,
	linux-kernel@vger.kernel.org, Orson Zhai <orsonzhai@gmail.com>,
	Chunyan Zhang <zhang.lyra@gmail.com>,
	Sheng Xu <sheng.xu@unisoc.com>,
	Chunyan Zhang <chunyan.zhang@unisoc.com>
Subject: [PATCH v2 0/2] Add Unisoc iommu basic driver
Date: Tue,  2 Feb 2021 15:32:56 +0800	[thread overview]
Message-ID: <20210202073258.559443-1-zhang.lyra@gmail.com> (raw)

From: Chunyan Zhang <chunyan.zhang@unisoc.com>

Changes since v1:
* Fixed compile errors reported by kernel test robot <lkp@intel.com>.
* 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:
* 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:
* 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 |  72 +++
 drivers/iommu/Kconfig                         |  12 +
 drivers/iommu/Makefile                        |   1 +
 drivers/iommu/sprd-iommu.c                    | 581 ++++++++++++++++++
 4 files changed, 666 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iommu/sprd,iommu.yaml
 create mode 100644 drivers/iommu/sprd-iommu.c

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2.25.1