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(+)
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