[PATCH 08/26] docs: i2c: i2c-protocol: properly name start and stop conditions

Luca Ceresoli
2020-01-05T22:51:15Z

In I2C there is no such thing as a "start bit" or a "stop bit". Use the
proper naming: "start condition" and "stop condition".

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
---
Documentation/i2c/i2c-protocol.rst | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/Documentation/i2c/i2c-protocol.rst b/Documentation/i2c/i2c-protocol.rst
index f289d7759a51..c090003f55ed 100644
--- a/Documentation/i2c/i2c-protocol.rst
+++ b/Documentation/i2c/i2c-protocol.rst
@@ -8,8 +8,8 @@ Key to symbols
==============

=============== =============================================================
-S (1 bit) : Start bit
-P (1 bit) : Stop bit
+S : Start condition
+P : Stop condition
Rd/Wr (1 bit) : Read/Write bit. Rd equals 1, Wr equals 0.
A, NA (1 bit) : Accept and reverse accept bit.
Addr (7 bits): I2C 7 bit address. Note that this can be expanded as usual to
@@ -46,9 +46,9 @@ Combined transactions

This corresponds to i2c_transfer().

-They are just like the above transactions, but instead of a stop bit P
-a start bit S is sent and the transaction continues. An example of
-a byte read, followed by a byte write::
+They are just like the above transactions, but instead of a stop
+condition P a start condition S is sent and the transaction continues.
+An example of a byte read, followed by a byte write::

S Addr Rd [A] [Data] NA S Addr Wr [A] Data [A] P

@@ -77,8 +77,9 @@ I2C_M_NOSTART:
S Addr Rd [A] [Data] NA Data [A] P

If you set the I2C_M_NOSTART variable for the first partial message,
- we do not generate Addr, but we do generate the startbit S. This will
- probably confuse all other clients on your bus, so don't try this.
+ we do not generate Addr, but we do generate the start condition S.
+ This will probably confuse all other clients on your bus, so don't
+ try this.

This is often used to gather transmits from multiple data buffers in
system memory into something that appears as a single transfer to the
--
2.24.1