Randy Dunlap wrote: > On 11/18/21 10:14 PM, Deep Majumder wrote: > > 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. > > I don't quite get the "cannot be used" part. > I created a free login and downloaded this spec, > so yes, it's a hassle, but why can it not be used? Perhaps a more appropriate wording would be "cannot be used as the only source of the spec"? Because as I understand, many users may be unwilling to sign up to a website just to download a spec sheet (if for no other reason, for the fear of spam). > > 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 > > > > > -- > ~Randy
