Re: [PATCH v3 2/7] dt-bindings: serial: 8250: aspeed: add aspeed,vuart-over-pci bool prop

Krzysztof Kozlowski <[email protected]> Thu, 25 Jun 2026 08:36:08 +0200

Newsgroups	org.ozlabs.lists.linux-aspeed,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-kernel,org.kernel.vger.linux-serial
Message-ID	<[email protected]>

On 24/06/2026 14:48, Grégoire Layet wrote:
> Hi Krzysztof,
> 
>> What does that mean? How UART can be accessible over PCI bus?
> 
> It's a Virtual UART. Internally, it's two FIFOs accessible via
> 8250-compatible register sets on both ends.

I do not know what is Virtual UART...

> There is 4 Virtuals UARTs on the LPC bus of the AST2600 and 2 of them
> are bridged over the PCI bus.
> So, from the host, you can access the 8250 register set on the PCI bus.

You mean these appear (or are) as PCI devices?

> 
Best regards,
Krzysztof