From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: [PATCH v2 0/9] Add device tree support for on-chip SRAM Date: Fri, 31 Aug 2012 11:26:55 +0200 Message-ID: <1346405224-20399-1-git-send-email-p.zabel@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Grant Likely , Rob Herring , Paul Gortmaker , Shawn Guo , Richard Zhao , Huang Shijie , Dong Aisheng , kernel@pengutronix.de, devicetree-discuss@lists.ozlabs.org List-Id: devicetree@vger.kernel.org These patches add support to configure on-chip SRAM via device-tree node and to obtain the resulting genalloc pool from a phandle pointing at the node. This allows drivers to allocate SRAM with the genalloc API without hard-coding the genalloc pool address. The on-chip SRAM on i.MX53 and i.MX6q is registered via device tree and changed to use the simple generic SRAM driver: ocram: ocram@00900000 { 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 5: vpu@63ff4000 { /* ... */ iram = <&ocram>; }; Changes since v1: - Added a generic SRAM driver in drivers/misc that does nothing but request/ioremap its given memory region and serve it via the genalloc API. - Renamed the i.MX device tree nodes from "iram" to "ocram". regards Philipp --- arch/arm/boot/dts/imx53.dtsi | 5 ++ arch/arm/boot/dts/imx6q.dtsi | 5 ++ arch/arm/plat-mxc/Kconfig | 4 -- arch/arm/plat-mxc/Makefile | 1 - arch/arm/plat-mxc/include/mach/iram.h | 41 ------------- arch/arm/plat-mxc/iram_alloc.c | 73 ----------------------- drivers/misc/Kconfig | 8 +++ drivers/misc/Makefile | 1 + drivers/misc/sram.c | 105 +++++++++++++++++++++++++++++++++ include/linux/genalloc.h | 14 +++++ lib/genalloc.c | 77 ++++++++++++++++++++++++ 11 files changed, 215 insertions(+), 119 deletions(-)