The link to the I2C specification is broken and is replaced in this patch by one that points to Rev 6 (2014) of the specification. Although `https://www.nxp.com"; hosts the Rev 7 (2021) of this specification, it is behind a login-wall and thus cannot be used. Thus, an additional link has been added (which doesn't require a login) and the NXP official docs link has been updated. The additional link is not the Wayback Machine link since it seems that the PDF has not been archived. Signed-off-by: Deep Majumder <deep@xxxxxxxxxxx> --- Documentation/i2c/summary.rst | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/Documentation/i2c/summary.rst b/Documentation/i2c/summary.rst index 136c4e333be7..3395e2e46d9c 100644 --- a/Documentation/i2c/summary.rst +++ b/Documentation/i2c/summary.rst @@ -11,9 +11,11 @@ systems. Some systems use variants that don't meet branding requirements, and so are not advertised as being I2C but come under different names, e.g. TWI (Two Wire Interface), IIC. -The official I2C specification is the `"I2C-bus specification and user -manual" (UM10204) <https://www.nxp.com/docs/en/user-guide/UM10204.pdf>`_ -published by NXP Semiconductors. +The official I2C specification (revision 7) is the `"I2C-bus specification and user +manual" (UM10204) <https://www.nxp.com/webapp/Download?colCode=UM10204&location=null>`_ +published by NXP Semiconductors. However, you need to log-in to the site to +access the PDF. An older version of the specification (revision 6) is available +`here <https://www.pololu.com/file/0J435/UM10204.pdf>`_. SMBus (System Management Bus) is based on the I2C protocol, and is mostly a subset of I2C protocols and signaling. Many I2C devices will work on an -- 2.30.2
