lkml.org 
[lkml]   [2013]   [Mar]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH v9 RESEND 0/4] Add generic driver for on-chip SRAM
    Date
    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?

    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@00900000 {
    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@63ff4000 {
    /* ... */
    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(-)



    \
     
     \ /
      Last update: 2013-03-20 12:43    [W:9.379 / U:0.064 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site