[PATCH v8 02/10] accel/rocket: Add a new driver for Rockchip's NPU

[Jeff Hugo]

On 7/13/2025 2:38 AM, Tomeu Vizoso wrote:
> This initial version supports the NPU as shipped in the RK3588 SoC and
> described in the first part of its TRM, in Chapter 36.
> 
> This NPU contains 3 independent cores that the driver can submit jobs
> to.
> 
> This commit adds just hardware initialization and power management.
> 
> v2:
> - Split cores and IOMMUs as independent devices (Sebastian Reichel)
> - Add some documentation (Jeffrey Hugo)
> - Be more explicit in the Kconfig documentation (Jeffrey Hugo)
> - Remove resets, as these haven't been found useful so far (Zenghui Yu)
> - Repack structs (Jeffrey Hugo)
> - Use DEFINE_DRM_ACCEL_FOPS (Jeffrey Hugo)
> - Use devm_drm_dev_alloc (Jeffrey Hugo)
> - Use probe log helper (Jeffrey Hugo)
> - Introduce UABI header in a later patch (Jeffrey Hugo)
> 
> v3:
> - Adapt to a split of the register block in the DT bindings (Nicolas
>    Frattaroli)
> - Move registers header to its own commit (Thomas Zimmermann)
> - Misc. cleanups (Thomas Zimmermann and Jeff Hugo)
> - Make use of GPL-2.0-only for the copyright notice (Jeff Hugo)
> - PM improvements (Nicolas Frattaroli)
> 
> v4:
> - Use bulk clk API (Krzysztof Kozlowski)
> 
> v6:
> - Remove mention to NVDLA, as the hardware is only incidentally related
>    (Kever Yang)
> - Use calloc instead of GFP_ZERO (Jeff Hugo)
> - Explicitly include linux/container_of.h (Jeff Hugo)
> - pclk and npu clocks are now needed by all cores (Rob Herring)
> 
> v7:
> - Assign its own IOMMU domain to each client, for isolation (Daniel
>    Stone and Robin Murphy)
> 
> v8:
> - Kconfig: fix depends to be more explicit about Rockchip, and remove
>    superfluous selects (Robin Murphy)
> - Use reset lines to reset the cores (Robin Murphy)
> - Reference count the module
> - Set dma_set_max_seg_size
> - Correctly acquire a reference to the IOMMU (Robin Murphy)
> - Remove notion of top core (Robin Murphy)
> 
> Reviewed-by: Robert Foss <rfoss at kernel.org>
> Tested-by: Heiko Stuebner <heiko at sntech.de>
> Signed-off-by: Tomeu Vizoso <tomeu at tomeuvizoso.net>

Reviewed-by: Jeff Hugo <jeff.hugo at oss.qualcomm.com>