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Date: Fri, 8 Mar 2024 15:43:14 +0200
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Howard Yen <howardyen@google.com>
Cc: gregkh@linuxfoundation.org, rafael@kernel.org, mathias.nyman@intel.com,
	hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com,
	petr.tesarik.ext@huawei.com, broonie@kernel.org, james@equiv.tech,
	james.clark@arm.com, masahiroy@kernel.org,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	iommu@lists.linux.dev
Subject: Re: [PATCH v4 2/2] usb: host: xhci-plat: add support for multi
 memory regions
Message-ID: <ZesV8iKdf1tQQtXu@smile.fi.intel.com>
References: <20240308095320.1961469-1-howardyen@google.com>
 <20240308095320.1961469-3-howardyen@google.com>
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Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo

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