[PATCH v9 RESEND 0/4] Add generic driver for on-chip SRAM

From: Philipp Zabel
Date: Wed Mar 20 2013 - 06:53:40 EST


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(-)

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