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    Subject[PATCH v3 0/4] Add device tree support for on-chip SRAM
    Date
    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 v2, as per Shawn's suggestions:
    - Moved struct device_node declaration out of #ifdef CONFIG_OF.
    - Simplified of_get_named_gen_pool using of_parse_phandle and
    of_address_to_resource.
    - Return -EADDRNOTAVAIL if devm_request_and_ioremap fails.
    - Squashed i.MX changes together.

    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 | 9 +++
    drivers/misc/Makefile | 1 +
    drivers/misc/sram.c | 105 +++++++++++++++++++++++++++++++++
    include/linux/genalloc.h | 14 +++++
    lib/genalloc.c | 67 +++++++++++++++++++++
    11 files changed, 206 insertions(+), 119 deletions(-)



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