From mboxrd@z Thu Jan 1 00:00:00 1970 From: Philipp Zabel Subject: [PATCH v5 0/4] Add generic driver for on-chip SRAM Date: Thu, 18 Oct 2012 16:27:29 +0200 Message-ID: <1350570453-24546-1-git-send-email-p.zabel@pengutronix.de> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, Arnd Bergmann , Greg Kroah-Hartman , Grant Likely , Rob Herring , Paul Gortmaker , Shawn Guo , Richard Zhao , Huang Shijie , Dong Aisheng , Matt Porter , 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 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. 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@00900000 { compatible = "fsl,imx-ocram", "sram"; reg = <0x00900000 0x3f000>; alloc-order = <12>; }; 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@63ff4000 { /* ... */ iram = <&ocram>; }; Changes since v4: - Added Matt Porter's patch to configure alloc order, so that the driver can be used for TI Davinci. - Removed device tree patches as those should go through the ARM SoC tree. regards Philipp --- Documentation/devicetree/bindings/misc/sram.txt | 27 +++++ drivers/misc/Kconfig | 9 ++ drivers/misc/Makefile | 1 + drivers/misc/sram.c | 133 +++++++++++++++++++++++ include/linux/genalloc.h | 14 +++ include/linux/platform_data/sram.h | 25 +++++ lib/genalloc.c | 67 ++++++++++++ 7 files changed, 276 insertions(+)