[RESEND PATCH 1/2] i2c: added FUNC flag for unsupported clock stretching

From: Nicola Corna
Date: Mon Sep 07 2015 - 06:27:19 EST

Added I2C_FUNC_NO_CLK_STRETCH, to be used when clock stretching is not

Signed-off-by: Nicola Corna <nicola@xxxxxxxxxx>
Documentation/i2c/functionality | 1 +
include/uapi/linux/i2c.h | 1 +
2 files changed, 2 insertions(+)

diff --git a/Documentation/i2c/functionality b/Documentation/i2c/functionality
index 4aae8ed..f53807e 100644
--- a/Documentation/i2c/functionality
+++ b/Documentation/i2c/functionality
@@ -21,6 +21,7 @@ For the most up-to-date list of functionality constants, please check
flags (which modify the I2C protocol!)
I2C_FUNC_NOSTART Can skip repeated start sequence
+ I2C_FUNC_NO_CLK_STRETCH Does NOT support clock stretching
I2C_FUNC_SMBUS_QUICK Handles the SMBus write_quick command
I2C_FUNC_SMBUS_READ_BYTE Handles the SMBus read_byte command
I2C_FUNC_SMBUS_WRITE_BYTE Handles the SMBus write_byte command
diff --git a/include/uapi/linux/i2c.h b/include/uapi/linux/i2c.h
index b0a7dd6..59e4b43 100644
--- a/include/uapi/linux/i2c.h
+++ b/include/uapi/linux/i2c.h
@@ -88,6 +88,7 @@ struct i2c_msg {
#define I2C_FUNC_SMBUS_PEC 0x00000008
#define I2C_FUNC_NOSTART 0x00000010 /* I2C_M_NOSTART */
#define I2C_FUNC_SLAVE 0x00000020
+#define I2C_FUNC_NO_CLK_STRETCH 0x00000040 /* No check for SCL low */
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
#define I2C_FUNC_SMBUS_QUICK 0x00010000
#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000

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