Jl-spp Driver Official

Using devm_platform_ioremap_resource() ensures automatic resource cleanup. Registers should be accessed via readl()/writel() with proper barriers to prevent reordering.

In an actual project (anonymized), a JL-SPP driver initially achieved 12 MB/s due to per-byte interrupts. After converting to descriptor-based DMA and NAPI, throughput rose to 480 MB/s, limited only by the memory bus. This highlights the importance of reducing interrupt frequency and maximizing data per DMA transfer. jl-spp driver

Implement suspend/resume callbacks to save/restore registers. The JL-SPP might lose context during system suspend, so the driver must reinitialize DMA queues upon resume. throughput rose to 480 MB/s