linux-kernel - Re: [PATCH v7 0/4] Add generic driver for on-chip SRAM

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Date:	Tue, 4 Dec 2012 08:19:18 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Philipp Zabel <p.zabel@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Richard Zhao <richard.zhao@...escale.com>,
	Huang Shijie <shijie8@...il.com>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Matt Porter <mporter@...com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Javier Martin <javier.martin@...ta-silicon.com>,
	kernel@...gutronix.de, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH v7 0/4] Add generic driver for on-chip SRAM

On Tue, Dec 04, 2012 at 09:53:38AM +0100, Philipp Zabel wrote:
> Hi,
> 
> On Fri, 2012-11-23 at 15:24 +0100, Philipp Zabel wrote:
> > These patches add support to configure on-chip SRAM via device-tree
> > node or platform data and to obtain the resulting genalloc pool from
> > the physical address or a phandle pointing at the device tree node.
> > This allows drivers to allocate SRAM with the genalloc API without
> > hard-coding the genalloc pool pointer.
> 
> are there any further comments on this series?
> 
> > The on-chip SRAM on i.MX53 and i.MX6q can be registered via device tree
> > and changed to use the simple generic SRAM driver:
> > 
> >                 ocram: ocram@...00000 {
> >                         compatible = "fsl,imx-ocram", "sram";
> >                         reg = <0x00900000 0x3f000>;
> >                 };
> > 
> > A driver that needs to allocate SRAM buffers, like the video processing
> > unit on i.MX53, can retrieve the genalloc pool from a phandle in the
> > device tree using of_get_named_gen_pool(node, "iram", 0) from patch 1:
> > 
> >                 vpu@...f4000 {
> >                         /* ... */
> >                         iram = <&ocram>;
> >                 };
> > 
> > The allocation granularity is hard-coded to 32 bytes for now,
> > until a way to configure it can be agreed upon. There is overhead
> > for bigger SRAMs, where only a much coarser allocation granularity
> > is needed: At 32 bytes minimum allocation size, a 256 KiB SRAM
> > needs a 1 KiB bitmap to track allocations.
> > 
> > Once everybody is ok with it, could the first two patches be merged
> > through the char-misc tree? I'll resend the i.MX and coda patches to
> > the respective lists afterwards.
> 
> Arnd, Greg, would you take the first patch "genalloc: add a global pool
> list, allow to find pools by phys address" into the char-misc tree if
> there are no vetoes? Or should I try and get it merged separately,
> first?

It's too late for anything new for 3.8, so how about resending this all
after 3.8-rc1 is out and we can take it from there?

thanks,

greg k-h
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