linux-kernel - Re: [PATCH v9 RESEND 0/4] Add generic driver for on-chip SRAM

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Message-ID: <1364373214.5442.1.camel@pizza.hi.pengutronix.de>
Date:	Wed, 27 Mar 2013 09:33:34 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	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 v9 RESEND 0/4] Add generic driver for on-chip SRAM

Am Mittwoch, den 20.03.2013, 11:52 +0100 schrieb Philipp Zabel:
> Hi, last time I posted was a bit close to the merge window, so I'm
> reposting now. Greg, Arnd, could you take the first two patches?

Ping,

can I do anything to help move this along?

regards
Philipp

> 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 struct device pointer 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.
> 
> 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", "mmio-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>;
>  		};
> 
> Changes since v8:
>  - The sram driver now matches against the "mmio-sram" compatible string.
>  - Removed a whitespace error in the device tree binding documentation.
> 
> regards
> Philipp
> 
> ---
>  Documentation/devicetree/bindings/media/coda.txt |   30 ++++++
>  Documentation/devicetree/bindings/misc/sram.txt  |   16 +++
>  arch/arm/boot/dts/imx53.dtsi                     |    5 +
>  arch/arm/boot/dts/imx6q.dtsi                     |    6 ++
>  drivers/media/platform/Kconfig                   |    1 -
>  drivers/media/platform/coda.c                    |   45 +++++---
>  drivers/misc/Kconfig                             |    9 ++
>  drivers/misc/Makefile                            |    1 +
>  drivers/misc/sram.c                              |  121 ++++++++++++++++++++++
>  include/linux/genalloc.h                         |   15 +++
>  include/linux/platform_data/coda.h               |   18 ++++
>  lib/genalloc.c                                   |   81 +++++++++++++++
>  12 files changed, 333 insertions(+), 15 deletions(-)
> 
> 


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