[PATCH v4 0/3] Add UFS Host driver support for SpacemiT K3 SoC

[Yixun Lan]

This series try to add UFS support for SpacemiT K3 SoC, the controller
components consists of System Bus Interface Unit, UFS Host Controller
Interface, UFS Transport Protocol Layer, UFS Host Registers, Device
Management Entity (DME), Transport Layer, Network Layer, Data Link
Layer, PHY Adapter Layer, and M-PHY Interface. A more detail functional
block diagram can be found in SpacemiT website, chapter 9.7.3 [1]

One known issue is that the device will occasionally raise BKOPS interrupt
when doing some high load test, log from dmesg shows

[  806.710763] ufshcd-spacemit c0e00000.ufshc: ufshcd_bkops_exception_event_handler: device raised urgent BKOPS exception for bkops status 1

Link: https://spacemit.com/community/document/info?nodepath=hardware/key_stone/k3/k3_docs/k3_usermanual/09_memory_storage.md&lang=en [1]
Signed-off-by: Yixun Lan <dlan at kernel.org>
---
Changes in v4:
- fix clock and reset settings
- drop function which retrieve value of tx_lanes
- propagate return error of ufs_spacemit_dme_set()
- check return value ufs_spacemit_check_hibern8()
- drop call to ufshcd_vops_phy_initialization()
- handle compiling warning if CONFIG_OF not enabled
 add __maybe_unused to ufs_spacemit_of_match
- Link to v3: https://patch.msgid.link/20260806-08-k3-ufs-support-v3-0-037fb322acdb@kernel.org

Changes in v3:
- collect tags
- fix dt-binding warning reported-by sashiko
- fix low freq in opp-2 table
- fix err checking in check_hibern8()
- propagate err code in link_startup_notify()
- update documents for event_notify()
- ufs clock driver is merged into v7.3-rc1, update cover letter
- Link to v2: https://patch.msgid.link/20260725-08-k3-ufs-support-v2-0-45036a2a2418@kernel.org

Changes in v2:
- fix missing interrupts property
- move ufs node to k3-com260.dtsi
- convert freq-table-hz to operating-points-v2
- rework reset_control, fix header and drop global variable
- drop dump_host_regs() debug interface
- converge and refactor dme_set() operations
- massive reduce of busy delay() loops
- drop vendor specific hce_enable_notify(), fallback to default
- drop unused member from struct ufs_spacemit_host
- add COMPILE_TEST support to Kconfig
- comment style fix
- Link to v1: https://patch.msgid.link/20260702-08-k3-ufs-support-v1-0-1a64a3ab128f@kernel.org

---
Yixun Lan (3):
      scsi: ufs: spacemit: dt-bindings: Add UFS controller for K3 SoC
      scsi: ufs: spacemit: k3: Add UFS Host Controller driver
      riscv: dts: spacemit: k3: Add UFS support

 .../devicetree/bindings/ufs/spacemit,k3-ufshc.yaml |  56 ++
 arch/riscv/boot/dts/spacemit/k3-com260.dtsi        |   4 +
 arch/riscv/boot/dts/spacemit/k3-pico-itx.dts       |   4 +
 arch/riscv/boot/dts/spacemit/k3.dtsi               |  22 +
 drivers/ufs/host/Kconfig                           |  12 +
 drivers/ufs/host/Makefile                          |   1 +
 drivers/ufs/host/ufs-spacemit.c                    | 678 +++++++++++++++++++++
 drivers/ufs/host/ufs-spacemit.h                    |  79 +++
 8 files changed, 856 insertions(+)
---
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
change-id: 20260605-08-k3-ufs-support-c8b308e415e2

Best regards,
--  
Yixun Lan <dlan at kernel.org>