i2c: i2c-ocores: support for 16bit and 32bit IO

Some architectures supports only 16-bit or 32-bit read/write access to
their IO space. Add a 'reg-io-width' platform and OF parameter which
specifies the IO width to support these platforms.

reg-io-width can be specified as 1, 2 or 4, and has a default value
of 1 if it is unspecified.

Signed-off-by: Ganesan Ramalingam <ganesanr@broadcom.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
index 1c9334bfc39c..c15781f4dc8c 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
@@ -10,6 +10,7 @@ Required properties:
 
 Optional properties:
 - reg-shift       : device register offsets are shifted by this value
+- reg-io-width    : io register width in bytes (1, 2 or 4)
 - regstep         : deprecated, use reg-shift above
 
 Example:
@@ -23,6 +24,7 @@ Example:
                 clock-frequency = <20000000>;
 
                 reg-shift = <0>;        /* 8 bit registers */
+                reg-io-width = <1>;     /* 8 bit read/write */
 
                 dummy@60 {
                         compatible = "dummy";