[PATCH v6] ARM: davinci: i2c: add OF support

add of support for the davinci i2c driver.

Signed-off-by: Heiko Schocher <redacted>
Signed-off-by: Sekhar Nori <redacted>
Cc: davinci-linux-open-source at linux.davincidsp.com
Cc: linux-arm-kernel at lists.infradead.org
Cc: devicetree-discuss at lists.ozlabs.org
Cc: linux-i2c at vger.kernel.org
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Wolfram Sang <redacted>
Cc: Grant Likely <redacted>
Cc: Sekhar Nori <redacted>
Cc: Wolfgang Denk <redacted>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>

---
- changes for v2:
- add comments from Sylwester Nawrocki [off-list ref]:
  - use "cell-index" instead "id"
  - OF_DEV_AUXDATA in the machine code, instead pre-define platform
    device name
- add comment from Grant Likely:
  - removed "id" resp. "cell-index" completely
  - fixed documentation
  - use of_match_ptr()
  - use devm_kzalloc() for allocating plattform data mem
  - fixed a whitespace issue
- no changes for v3
- changes for v4
  remove "pinmux-handle" property as discussed here:
  http://www.spinics.net/lists/arm-kernel/msg175701.html
  with Nori Sekhar

- changes for v5
  add comments from Grant Likely:
  - do not change value of dev->dev->platform_data, instead
    hold a copy in davinci_i2c_dev.

- changes for v6:
  add comments from Sekhar Nori:
  - removed unneccessary include
  - merge patch from Sekhar Nori:
    setup the newly introduced dev->pdata member correctly once in
    probe -> i2c_get_plattformdata(() not needed, remove a lot of
    checks for pdata in code
  - add Signed-off-by: Sekhar Nori [off-list ref]
  - patch no longer in patchserie, as it has no dependencies.
---
 .../devicetree/bindings/arm/davinci/i2c.txt        |   31 ++++++++++++
 drivers/i2c/busses/i2c-davinci.c                   |   50 +++++++++++++++----
 2 files changed, 70 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/davinci/i2c.txt

diff --git a/Documentation/devicetree/bindings/arm/davinci/i2c.txt b/Documentation/devicetree/bindings/arm/davinci/i2c.txt
new file mode 100644
index 0000000..e98a025
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/davinci/i2c.txt

@@ -0,0 +1,31 @@
+* Texas Instruments Davinci I2C
+
+This file provides information, what the device node for the
+davinci i2c interface contain.
+
+Required properties:
+- compatible: "ti,davinci-i2c";
+- reg : Offset and length of the register set for the device
+
+Recommended properties :
+- interrupts : <a> standard interrupt property.
+- clock-frequency : desired I2C bus clock frequency in Hz.
+
+Optional properties:
+- bus-delay: bus delay in usec