Re: [PATCH v4 2/2] usb: host: xhci-plat: add support for multi memory regions

[Andy Shevchenko]

On Fri, Mar 08, 2024 at 09:53:20AM +0000, Howard Yen wrote:
> The reason why it needs multiple regions is that in my system there is
> an always-on subsystem which includes a small size memory, and several
> functions need to run and occupy the memory from the small memory if
> they need to run on the always-on subsystem. These functions must
> allocate the memory from the small memory region, so that they can get
> benefit from the always-on subsystem. So the small memory is split for
> multiple functions which are satisfied with their generic use cases.
> But in specific use cases, like USB3 devices which support the stream
> trasnsfer or multiple devices connect to the host, they required more
> memory than their pre-allocated memory region, so I tried to propose
> this patch to give it the ability to get the memory from the other
> larger memory to solve the issue.

..

> +	count = of_property_count_elems_of_size(sysdev->of_node, "memory-region",
> +						sizeof(u32));

Open coded of_property_count_u32_elems().

-- 
With Best Regards,
Andy Shevchenko