linux-kernel - Re: [PATCH v2] Docs: Fixes link to I2C specification

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Date:   Sun, 21 Nov 2021 23:16:54 +0530
From:   Deep Majumder <deep@...tmail.in>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     wsa@...nel.org, linux-doc@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Docs: Fixes link to I2C specification

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@...tmail.in>
> > ---
> >   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