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 1:
vpu@63ff4000 {
/* ... */
iram = <&ocram>;
};
Changes since v3:
- Added devicetree binding documentation
- Register platform driver early with postcore_initcall
- Added optional SRAM clock support.
regards
Philipp
---
Documentation/devicetree/bindings/misc/sram.txt | 17 ++++
arch/arm/boot/dts/imx53.dtsi | 5 +
arch/arm/boot/dts/imx6q.dtsi | 5 +
arch/arm/mach-imx/clk-imx6q.c | 1 +
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 | 121 +++++++++++++++++++++++
include/linux/genalloc.h | 14 +++
lib/genalloc.c | 67 +++++++++++++
13 files changed, 240 insertions(+), 119 deletions(-)
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