linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Kevin Hilman <khilman@baylibre.com>
To: Lucas Tanure <tanure@linux.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Cc: linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
	Lucas Tanure <tanure@linux.com>
Subject: Re: [PATCH 0/3] Ensure Low period of SCL is correct
Date: Mon, 28 Mar 2022 13:37:52 -0700	[thread overview]
Message-ID: <7hee2lu82n.fsf@baylibre.com> (raw)
In-Reply-To: <20220326102229.421718-1-tanure@linux.com>

Hi Lucas,

Lucas Tanure <tanure@linux.com> writes:

> The default duty cycle of 33% is less than the required
> by the I2C specs for the LOW period of the SCL clock.
>
> So, for 100Khz or less, use 50%H/50%L duty cycle, and
> for the clock above 100Khz, use 40%H/60%L duty cycle.
> That ensures the low period of SCL is always more than
> the minimum required by the specs at any given frequency.

Thanks for the fixes!

This is going to affect all SoCs, so ould you please summarize how your
changes were tested, and on which SoCs & boards?

Thanks,

Kevin

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-03-28 20:39 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-26 10:22 [PATCH 0/3] Ensure Low period of SCL is correct Lucas Tanure
2022-03-26 10:22 ` [PATCH 1/3] i2c: meson: Use _SHIFT and _MASK for register definitions Lucas Tanure
2022-03-26 10:22 ` [PATCH 2/3] i2c: meson: Use 50% duty cycle for I2C clock Lucas Tanure
2022-04-05  9:30   ` Neil Armstrong
2022-04-06 11:31   ` Neil Armstrong
2022-04-08  7:18     ` Lucas Tanure
2022-03-26 10:22 ` [PATCH 3/3] i2c: meson: Remove meson_i2c_data Lucas Tanure
2022-03-28 20:37 ` Kevin Hilman [this message]
2022-03-28 22:31   ` [PATCH 0/3] Ensure Low period of SCL is correct Lucas Tanure
2022-04-04  8:01     ` Neil Armstrong
2022-04-04 18:00       ` Vyacheslav
     [not found]   ` <CAJX_Q+1Y5pO_AGaFSXfo-J3EdGQeM2XYXzvsUtjtAFEXdwKEdQ@mail.gmail.com>
2022-04-05 15:11     ` Neil Armstrong
2022-04-08  7:19       ` Lucas Tanure

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=7hee2lu82n.fsf@baylibre.com \
    --to=khilman@baylibre.com \
    --cc=jbrunet@baylibre.com \
    --cc=linux-amlogic@lists.infradead.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-i2c@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=martin.blumenstingl@googlemail.com \
    --cc=narmstrong@baylibre.com \
    --cc=tanure@linux.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).