linux-kernel - Re: [PATCH v3 2/2] remoteproc: add support to handle internal memories

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Message-ID: <CAK=WgbaK+TNJR1UHm7orcFk7kaGTWMQsW0XhX_t7qvWwe+YJEg@mail.gmail.com>
Date:	Fri, 13 Feb 2015 07:20:16 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Suman Anna <s-anna@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...aro.org>,
	Dave Gerlach <d-gerlach@...com>, Robert Tivy <rtivy@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 2/2] remoteproc: add support to handle internal memories

On Thu, Feb 12, 2015 at 10:54 PM, Suman Anna <s-anna@...com> wrote:
> My original motivation was that it would only need to be added on
> firmwares requiring support for loading into internal memories,
> otherwise, these are something left to be managed by the software
> running on the remote processor completely, and MPU will not even touch
> them.

Sure. But even if you guys will use this interface correctly, this
patch essentially exposes ioremap to user space, which is something we
generally want to avoid.

> So, let me know if this is a NAK. If so, we have two options - one to go
> the sram node model where each of them have to be defined separately,
> and have a specific property in the rproc nodes to be able to get the
> gen_pool handles. The other one is simply to define these as <reg> and
> use devm_ioremap_resource() (so use DT for defining the regions instead
> of a resource table entry).

Any approach where these regions are defined explicitly really sounds
better. If you could look into these two alternatives that would be
great.

Thanks,
Ohad.
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