i2c: exynos5: add support for HSI2C on Exynos5260 SoC

HSI2C module on Exynos5260 differs from current modules in
following ways:
1.  HSI2C on Exynos5260 has fifo_depth of 16bytes
2.  Module needs to be reset as a part of init sequence.

Hence, Following changes are involved.
1. Add a new compatible string and Updates the Documentation dt bindings.
2. Introduce a variant struct to support the changes in H/W
3. Reset the module during init. Thus, bringing the module back
to default state irrespective of what firmware did with it.

Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 9 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
index 056732cfdcee..d4745e31f5c6 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
@@ -5,7 +5,14 @@ at various speeds ranging from 100khz to 3.4Mhz.
 
 Required properties:
   - compatible: value should be.
-      -> "samsung,exynos5-hsi2c", for i2c compatible with exynos5 hsi2c.
+	-> "samsung,exynos5-hsi2c", (DEPRECATED)
+				for i2c compatible with HSI2C available
+				on Exynos5250 and Exynos5420 SoCs.
+	-> "samsung,exynos5250-hsi2c", for i2c compatible with HSI2C available
+				on Exynos5250 and Exynos5420 SoCs.
+	-> "samsung,exynos5260-hsi2c", for i2c compatible with HSI2C available
+				on Exynos5260 SoCs.
+
   - reg: physical base address of the controller and length of memory mapped
     region.
   - interrupts: interrupt number to the cpu.
@@ -26,7 +33,7 @@ Optional properties:
 Example:
 
 hsi2c@12ca0000 {
-	compatible = "samsung,exynos5-hsi2c";
+	compatible = "samsung,exynos5250-hsi2c";
 	reg = <0x12ca0000 0x100>;
 	interrupts = <56>;
 	clock-frequency = <100000>;