From: Greg KH <gregkh@linuxfoundation.org>
To: Hugo Villeneuve <hugo@hugovil.com>
Cc: robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
conor+dt@kernel.org, jirislaby@kernel.org, jringle@gridpoint.com,
isaac.true@canonical.com, jesse.sung@canonical.com,
l.perczak@camlintechnologies.com, tomasz.mon@camlingroup.com,
linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
Hugo Villeneuve <hvilleneuve@dimonoff.com>,
Lech Perczak <lech.perczak@camlingroup.com>
Subject: Re: [PATCH v9 09/10] serial: sc16is7xx: add post reset delay
Date: Mon, 31 Jul 2023 17:57:50 +0200 [thread overview]
Message-ID: <2023073159-follow-resume-cc9b@gregkh> (raw)
In-Reply-To: <20230725142343.1724130-10-hugo@hugovil.com>
On Tue, Jul 25, 2023 at 10:23:41AM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
>
> Make sure we wait at least 3us before initiating communication with
> the device after reset.
That says what you do, but not _why_ you do it?
Please read the kernel documentation again for how to write a good
changelog text. It's usually the hardest part of submitting a patch.
>
> Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
> Reviewed-by: Lech Perczak <lech.perczak@camlingroup.com>
> Tested-by: Lech Perczak <lech.perczak@camlingroup.com>
> ---
> drivers/tty/serial/sc16is7xx.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
> index 49213be60baf..718e982e1efe 100644
> --- a/drivers/tty/serial/sc16is7xx.c
> +++ b/drivers/tty/serial/sc16is7xx.c
> @@ -1526,6 +1526,12 @@ static int sc16is7xx_probe(struct device *dev,
> regmap_write(s->regmap, SC16IS7XX_IOCONTROL_REG << SC16IS7XX_REG_SHIFT,
> SC16IS7XX_IOCONTROL_SRESET_BIT);
>
> + /*
> + * After reset, the host must wait at least 3us before initializing a
> + * communication with the device.
> + */
> + usleep_range(5, 10);
5, 10 is NOT 3us.
:(
next prev parent reply other threads:[~2023-07-31 15:58 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-25 14:23 [PATCH v9 00/10] serial: sc16is7xx: fix GPIO regression and rs485 improvements Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 01/10] serial: sc16is7xx: fix broken port 0 uart init Hugo Villeneuve
2023-07-31 15:52 ` Greg KH
2023-08-01 17:16 ` Hugo Villeneuve
2023-08-03 7:54 ` Greg KH
2023-08-03 13:04 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 02/10] serial: sc16is7xx: mark IOCONTROL register as volatile Hugo Villeneuve
2023-07-31 15:50 ` Greg KH
2023-07-31 16:22 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 03/10] serial: sc16is7xx: remove obsolete out_thread label Hugo Villeneuve
2023-07-31 15:53 ` Greg KH
2023-08-01 17:29 ` Hugo Villeneuve
2023-08-03 7:55 ` Greg KH
2023-07-25 14:23 ` [PATCH v9 04/10] serial: sc16is7xx: refactor GPIO controller registration Hugo Villeneuve
2023-07-31 15:55 ` Greg KH
2023-08-03 16:14 ` Hugo Villeneuve
2023-08-04 13:14 ` Greg KH
2023-08-04 14:15 ` Hugo Villeneuve
2023-08-04 15:09 ` Greg KH
2023-08-07 14:57 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 05/10] dt-bindings: sc16is7xx: Add property to change GPIO function Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 06/10] serial: sc16is7xx: fix regression with GPIO configuration Hugo Villeneuve
2023-07-31 15:58 ` Greg KH
2023-08-03 14:18 ` Hugo Villeneuve
2023-08-03 21:04 ` Andy Shevchenko
2023-08-04 4:53 ` Greg KH
2023-07-25 14:23 ` [PATCH v9 07/10] serial: sc16is7xx: fix bug when first setting GPIO direction Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 08/10] serial: sc16is7xx: add call to get rs485 DT flags and properties Hugo Villeneuve
2023-07-31 15:59 ` Greg KH
2023-08-03 14:38 ` Hugo Villeneuve
2023-08-04 13:14 ` Greg KH
2023-07-25 14:23 ` [PATCH v9 09/10] serial: sc16is7xx: add post reset delay Hugo Villeneuve
2023-07-31 15:57 ` Greg KH [this message]
2023-07-31 17:00 ` Hugo Villeneuve
2023-07-25 14:23 ` [PATCH v9 10/10] serial: sc16is7xx: improve comments about variants Hugo Villeneuve
2023-07-31 15:56 ` Greg KH
2023-08-03 13:28 ` Hugo Villeneuve
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=2023073159-follow-resume-cc9b@gregkh \
--to=gregkh@linuxfoundation.org \
--cc=conor+dt@kernel.org \
--cc=devicetree@vger.kernel.org \
--cc=hugo@hugovil.com \
--cc=hvilleneuve@dimonoff.com \
--cc=isaac.true@canonical.com \
--cc=jesse.sung@canonical.com \
--cc=jirislaby@kernel.org \
--cc=jringle@gridpoint.com \
--cc=krzysztof.kozlowski+dt@linaro.org \
--cc=l.perczak@camlintechnologies.com \
--cc=lech.perczak@camlingroup.com \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=robh+dt@kernel.org \
--cc=tomasz.mon@camlingroup.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.