i2c: add i2c quirk flag for unsupported clock stretching

Add I2C_AQ_NO_CLK_STRETCH quirk flag, to be used when clock stretching is
not supported.

Signed-off-by: Nicola Corna <nicola@corna.info>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 768063baafbf5efe6c122a123b0c3f9bfe3bd050..96970024883ff9e955b8043684493b7f1753cbe4 100644 (file)
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -493,6 +493,8 @@ struct i2c_adapter_quirks {
 /* convenience macro for typical write-then read case */
 #define I2C_AQ_COMB_WRITE_THEN_READ    (I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST | \
                                         I2C_AQ_COMB_READ_SECOND | I2C_AQ_COMB_SAME_ADDR)
+/* clock stretching is not supported */
+#define I2C_AQ_NO_CLK_STRETCH          BIT(4)
 
 /*
  * i2c_adapter is the structure used to identify a physical i2c bus along