Hi,
On Fri, 2012-11-23 at 15:24 +0100, Philipp Zabel wrote:
> 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.
are there any further comments on this series?
> 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>;
> };
>
> 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>;
> };
>
> The allocation granularity is hard-coded to 32 bytes for now,
> until a way to configure it can be agreed upon. There is overhead
> for bigger SRAMs, where only a much coarser allocation granularity
> is needed: At 32 bytes minimum allocation size, a 256 KiB SRAM
> needs a 1 KiB bitmap to track allocations.
>
> Once everybody is ok with it, could the first two patches be merged
> through the char-misc tree? I'll resend the i.MX and coda patches to
> the respective lists afterwards.
Arnd, Greg, would you take the first patch "genalloc: add a global pool
list, allow to find pools by phys address" into the char-misc tree if
there are no vetoes? Or should I try and get it merged separately,
first?
regards
Philipp
> Changes since v6:
> - Reduced the hard coded allocation granularity to 32 bytes.
>
> regards
> Philipp
>
> ---
> Documentation/devicetree/bindings/misc/sram.txt | 17 ++++
> arch/arm/boot/dts/imx53.dtsi | 5 +
> arch/arm/boot/dts/imx6q.dtsi | 6 ++
> drivers/media/platform/Kconfig | 3 +-
> drivers/media/platform/coda.c | 47 ++++++---
> drivers/misc/Kconfig | 9 ++
> drivers/misc/Makefile | 1 +
> drivers/misc/sram.c | 121
> +++++++++++++++++++++++
> include/linux/genalloc.h | 14 +++
> lib/genalloc.c | 67 +++++++++++++
> 10 files changed, 274 insertions(+), 16 deletions(-)
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