From: "xingtong.wu" <xingtong_wu@163.com>
To: linux-watchdog@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: "Wu, Xing Tong" <XingTong.Wu@siemens.com>,
jan.kiszka@siemens.com, tobias.schaffner@siemens.com,
cedric.hombourger@siemens.com, gerd.haeussler.ext@siemens.com
Subject: wdat_wdt: Problem with WDAT using shared registers
Date: Fri, 28 Aug 2043 01:17:41 +0800 [thread overview]
Message-ID: <bef5a084-9a6c-daaf-dad9-89cb5fc32bf9@163.com> (raw)
Hi
I want to use the wdat_wdt to support a watchdog of SIONCT (a multi-function device
(mfd)), and I register instructions for wdat_wdt in BIOS, it need registers 0x2e-0x2f
to access the watchdog, then register 0x2e-0x2f will be forever occupied by platform
device wdat_wdt, see the code: https://elixir.bootlin.com/linux/v6.6-rc5/source/drivers/acpi/acpi_watchdog.c#L180
but the 0x2e-0x2f are special, they are used for a multi-function device --SIONCT, the
device have many pins can not only support features for watchdog, but also other
features like leds, fans, temperature monitor... there are drivers for these pins, e.g.
gpio-f7188x, nct6775, w83627hf... these driver use the shared register 0x2e-0x2f.
So the issue happened, the wdat_wdt occupied the shared register 0x2e-0x2f, then
the other driver can not load.
Here is the msg I collected from my device:
root@ipc-SIMATIC-IPC-BX-21A:/home/ipc# cat /proc/ioports
0000-0cf7 : PCI Bus 0000:00
0000-001f : dma1
0020-0021 : pic1
002e-002e : wdat_wdt
002f-002f : wdat_wdt
It will cause other SIONCT drivers can not load, e.g.
root@ipc-SIMATIC-IPC-BX-21A:/home/ipc# modprobe gpio-f7188x
modprobe: ERROR: could not insert 'gpio_f7188x': No such device
And dmesg info is:
[ 213.559168] gpio-f7188xI/O address 0x002e already in use
Same reason for other drivers:
root@ipc-SIMATIC-IPC-BX-21A:/home/ipc# modprobe nct6775
modprobe: ERROR: could not insert 'nct6775': No such device
Do you have any idea for the wdat_wdt to add support for multi-function device?
BRS
Xing Tong Wu
next reply other threads:[~2023-10-11 8:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2043-08-27 17:17 xingtong.wu [this message]
2023-10-11 15:29 ` wdat_wdt: Problem with WDAT using shared registers Guenter Roeck
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=bef5a084-9a6c-daaf-dad9-89cb5fc32bf9@163.com \
--to=xingtong_wu@163.com \
--cc=XingTong.Wu@siemens.com \
--cc=cedric.hombourger@siemens.com \
--cc=gerd.haeussler.ext@siemens.com \
--cc=jan.kiszka@siemens.com \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-watchdog@vger.kernel.org \
--cc=tobias.schaffner@siemens.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 read-only IMAP folder(s) and NNTP newsgroup(s).