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Gmane
From: Philipp Zabel <p.zabel <at> pengutronix.de>
Subject: [PATCH v9 0/4] Add generic driver for on-chip SRAM
Newsgroups: gmane.linux.kernel
Date: Wednesday 13th February 2013 15:46:38 UTC (over 3 years ago)
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: [email protected] {
                        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:

                [email protected] {
                        /* ... */
                        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(-)
 
CD: 16ms