Re: [PATCH v3 2/5] PCI: endpoint: Add DMA auxiliary resource metadata

[sashiko-bot@kernel.org]

> Extend EPC auxiliary resource metadata so endpoint functions can
> discover controller-owned DMA registers, logical DMA channels, and
> descriptor memory.
> 
> The DMA metadata is intentionally generic at the EPC layer. A backend
> reports the register layout, channel counts, logical channel resources,
> and descriptor memory resources. Logical channels carry hardware channel
> numbers and refer to descriptor memory by ID; reserving or delegating
> those channels is handled by separate EPC operations so resource metadata
> stays independent of any backend-specific DMA provider. Descriptor memory
> is identified separately so one memory resource can be shared by multiple
> channels.
> 
> For DesignWare controllers, reg_layout_data carries the eDMA/HDMA map
> format so a consumer can distinguish legacy, unroll, HDMA compatible,
> and HDMA native register layouts without making the EPC API itself
> DesignWare-specific.
> 
> Signed-off-by: Koichiro Den <den@valinux.co.jp>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260620170438.3756593-1-den@valinux.co.jp?part=2