* rtc_rv8803.ko does not create a /dev/rtc?
@ 2021-07-01 12:50
2021-07-02 13:08 ` Nobuhiro Iwamatsu
0 siblings, 1 reply; 3+ messages in thread
From: @ 2021-07-01 12:50 UTC (permalink / raw)
To: linux-rtc
Hi all,
I have a raspberry pi 3B, running kernel 5.10.17. On the i2c bus, I've added a rx8900 rtc chip. I would like to use this chip, but I fail to create a /dev/rtc for it.
I have checked the kernel version:
# uname -a
Linux raspberrypi 5.10.17-v7+ #1421 SMP Thu May 27 13:59:01 BST 2021 armv7l GNU/Linux
I've downloaded the rtc driver for this version of the kernel from here:
https://github.com/raspberrypi/linux/blob/rpi-5.10.y/drivers/rtc/rtc-rv8803.c
And compiled the driver with this makefile [1, see below] and installed the resulting rtc-rv8803.ko here:
$ modinfo /usr/lib/modules/5.10.17-v7+/kernel/drivers/rtc/rtc-rv8803.ko
filename: /usr/lib/modules/5.10.17-v7+/kernel/drivers/rtc/rtc-rv8803.ko
license: GPL v2
description: Micro Crystal RV8803 RTC driver
author: Alexandre Belloni <alexandre.belloni@bootlin.com>
srcversion: 0067552CB786360DEA9CADB
alias: i2c:rx8900
alias: i2c:rx8803
alias: i2c:rv8803
alias: of:N*T*Cepson,rx8900C*
alias: of:N*T*Cepson,rx8900
alias: of:N*T*Cepson,rx8803C*
alias: of:N*T*Cepson,rx8803
alias: of:N*T*Cmicrocrystal,rv8803C*
alias: of:N*T*Cmicrocrystal,rv8803
depends:
name: rtc_rv8803
vermagic: 5.10.17-v7+ SMP mod_unload modversions ARMv7 p2v8
Next I do the following steps to load the module:
# modprobe i2c:rx8900
[ 130.591843] rtc_rv8803: loading out-of-tree module taints kernel.
The module is loaded:
# lsmod
Module Size Used by
rtc_rv8803 16384 0
Next I bind the driver to the i2c address 0x32:
# echo i2c:rx8900 0x32 > /sys/class/i2c-adapter/i2c-1/new_device
[ 176.871589] i2c i2c-1: new_device: Instantiated device i2c:rx8900 at 0x32
This does not give me a /dev/rtc device:
# ls /dev/rtc*
ls: cannot access '/dev/rtc*': No such file or directory
The rtc is detected at address 0x32, but it's not claimed by any driver (that would have been indicated by UU instead of 32).
# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
30: -- -- 32 -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- 49 4a -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
What did I miss?
Kind regards,
Cedric
[1]
$ cat Makefile
RV8803_DIR = $(shell pwd)
KSRC = /lib/modules/$(KVER)/build
KVER = $(shell uname -r)
MODDESTDIR = /lib/modules/$(KVER)/kernel/drivers/rtc
CROSS_COMPILE =
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
DEPMOD = /sbin/depmod
INSTALL = /usr/bin/install
GREP = /bin/grep
obj-m += rtc-rv8803.o
all:
modules
modules:
$(MAKE) -C $(KSRC) M=$(RV8803_DIR) CC=$(CC) modules
install: modules
@$(GREP) rtc-rv8803.ko /lib/modules/$(shell uname -r)/modules.dep && rm -fr $(MODDESTDIR)/rtc-rv8803.ko || echo "No system rtc-rv8803.ko file found. Install the new rtc-rv8803.ko driver into the system"
$(INSTALL) -p -m 644 rtc-rv8803.ko $(MODDESTDIR)
@$(DEPMOD) -a
uninstall:
@$(GREP) rtc-rv8803.ko /lib/modules/$(shell uname -r)/modules.dep && rm -fr $(MODDESTDIR)/rtc-rv8803.ko || echo "Remove the rtc-rv8803.ko driver from the system"
@$(DEPMOD) -a
clean:
________________________________________________________
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: rtc_rv8803.ko does not create a /dev/rtc?
2021-07-01 12:50 rtc_rv8803.ko does not create a /dev/rtc?
@ 2021-07-02 13:08 ` Nobuhiro Iwamatsu
[not found] ` <e565b6503bfcf0dcd704e2959640aee5@mail.eclipso.de>
0 siblings, 1 reply; 3+ messages in thread
From: Nobuhiro Iwamatsu @ 2021-07-02 13:08 UTC (permalink / raw)
To: Cedric.dewijs; +Cc: linux-rtc
Hi,
2021年7月1日(木) 21:50 <Cedric.dewijs@eclipso.eu>:
>
> Hi all,
>
> I have a raspberry pi 3B, running kernel 5.10.17. On the i2c bus, I've added a rx8900 rtc chip. I would like to use this chip, but I fail to create a /dev/rtc for it.
>
> I have checked the kernel version:
> # uname -a
> Linux raspberrypi 5.10.17-v7+ #1421 SMP Thu May 27 13:59:01 BST 2021 armv7l GNU/Linux
>
> I've downloaded the rtc driver for this version of the kernel from here:
> https://github.com/raspberrypi/linux/blob/rpi-5.10.y/drivers/rtc/rtc-rv8803.c
>
> And compiled the driver with this makefile [1, see below] and installed the resulting rtc-rv8803.ko here:
>
> $ modinfo /usr/lib/modules/5.10.17-v7+/kernel/drivers/rtc/rtc-rv8803.ko
> filename: /usr/lib/modules/5.10.17-v7+/kernel/drivers/rtc/rtc-rv8803.ko
> license: GPL v2
> description: Micro Crystal RV8803 RTC driver
> author: Alexandre Belloni <alexandre.belloni@bootlin.com>
> srcversion: 0067552CB786360DEA9CADB
> alias: i2c:rx8900
> alias: i2c:rx8803
> alias: i2c:rv8803
> alias: of:N*T*Cepson,rx8900C*
> alias: of:N*T*Cepson,rx8900
> alias: of:N*T*Cepson,rx8803C*
> alias: of:N*T*Cepson,rx8803
> alias: of:N*T*Cmicrocrystal,rv8803C*
> alias: of:N*T*Cmicrocrystal,rv8803
> depends:
> name: rtc_rv8803
> vermagic: 5.10.17-v7+ SMP mod_unload modversions ARMv7 p2v8
>
> Next I do the following steps to load the module:
> # modprobe i2c:rx8900
> [ 130.591843] rtc_rv8803: loading out-of-tree module taints kernel.
This is not necessary if the module is installed correctly.
The module will be loaded when you write to '/sys/class/
i2c-adapter/i2c-1/new_device' below.
>
> The module is loaded:
> # lsmod
> Module Size Used by
> rtc_rv8803 16384 0
>
> Next I bind the driver to the i2c address 0x32:
> # echo i2c:rx8900 0x32 > /sys/class/i2c-adapter/i2c-1/new_device
I think ' i2c' is unnecessary.
Please check with following:
echo rx8900 0x32 > /sys/class/i2c-adapter/i2c-1/new_device
> [ 176.871589] i2c i2c-1: new_device: Instantiated device i2c:rx8900 at 0x32
>
> This does not give me a /dev/rtc device:
> # ls /dev/rtc*
> ls: cannot access '/dev/rtc*': No such file or directory
>
> The rtc is detected at address 0x32, but it's not claimed by any driver (that would have been indicated by UU instead of 32).
> # i2cdetect -y 1
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 00: -- -- -- -- -- -- -- -- -- -- -- -- --
> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
> 30: -- -- 32 -- -- -- -- -- -- -- -- -- -- -- -- --
> 40: -- -- -- -- -- -- -- -- -- 49 4a -- -- -- -- --
> 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
> 70: -- -- -- -- -- -- -- --
>
> What did I miss?
>
> Kind regards,
> Cedric
Best regards,
Nobuhiro
--
Nobuhiro Iwamatsu
iwamatsu at {nigauri.org / debian.org / kernel.org}
GPG ID: 40AD1FA6
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Fwd: Re: rtc_rv8803.ko does not create a /dev/rtc?
[not found] ` <e565b6503bfcf0dcd704e2959640aee5@mail.eclipso.de>
@ 2021-07-05 6:56 `
0 siblings, 0 replies; 3+ messages in thread
From: @ 2021-07-05 6:56 UTC (permalink / raw)
To: Cedric.dewijs, iwamatsu, linux-rtc@vger.kernel.org>
--- Ursprüngliche Nachricht ---
Von: " " <Cedric.dewijs@eclipso.eu>
Datum: 05.07.2021 06:32:30
An: <cedric.dewijs@eclipso.eu>
Betreff: Fwd: Re: rtc_rv8803.ko does not create a /dev/rtc?
--- Ursprüngliche Nachricht ---
Von: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Datum: 02.07.2021 15:08:38
An: Cedric.dewijs@eclipso.eu
Betreff: Re: rtc_rv8803.ko does not create a /dev/rtc?
Hi,
2021年7月1日(木) 21:50 <Cedric.dewijs@eclipso.eu>:
>
> Hi all,
>
> I have a raspberry pi 3B, running kernel 5.10.17. On the i2c bus, I've
added a rx8900 rtc chip. I would like to use this chip, but I fail to create
a /dev/rtc for it.
>
> I have checked the kernel version:
> # uname -a
> Linux raspberrypi 5.10.17-v7+ #1421 SMP Thu May 27 13:59:01 BST 2021
armv7l GNU/Linux
>
> I've downloaded the rtc driver for this version of the kernel from here:
> https://github.com/raspberrypi/linux/blob/rpi-5.10.y/drivers/rtc/rtc-rv8803.c
>
> And compiled the driver with this makefile [1, see below] and installed
the resulting rtc-rv8803.ko here:
>
> $ modinfo /usr/lib/modules/5.10.17-v7+/kernel/drivers/rtc/rtc-rv8803.ko
> filename: /usr/lib/modules/5.10.17-v7+/kernel/drivers/rtc/rtc-rv8803.ko
> license: GPL v2
> description: Micro Crystal RV8803 RTC driver
> author: Alexandre Belloni <alexandre.belloni@bootlin.com>
> srcversion: 0067552CB786360DEA9CADB
> alias: i2c:rx8900
> alias: i2c:rx8803
> alias: i2c:rv8803
> alias: of:N*T*Cepson,rx8900C*
> alias: of:N*T*Cepson,rx8900
> alias: of:N*T*Cepson,rx8803C*
> alias: of:N*T*Cepson,rx8803
> alias: of:N*T*Cmicrocrystal,rv8803C*
> alias: of:N*T*Cmicrocrystal,rv8803
> depends:
> name: rtc_rv8803
> vermagic: 5.10.17-v7+ SMP mod_unload modversions ARMv7 p2v8
>
> Next I do the following steps to load the module:
> # modprobe i2c:rx8900
> [ 130.591843] rtc_rv8803: loading out-of-tree module taints kernel.
This is not necessary if the module is installed correctly.
The module will be loaded when you write to '/sys/class/
i2c-adapter/i2c-1/new_device' below.
>
> The module is loaded:
> # lsmod
> Module Size Used by
> rtc_rv8803 16384 0
>
> Next I bind the driver to the i2c address 0x32:
> # echo i2c:rx8900 0x32 > /sys/class/i2c-adapter/i2c-1/new_device
I think ' i2c' is unnecessary.
Please check with following:
echo rx8900 0x32 > /sys/class/i2c-adapter/i2c-1/new_device
> [ 176.871589] i2c i2c-1: new_device: Instantiated device i2c:rx8900
at 0x32
>
> This does not give me a /dev/rtc device:
> # ls /dev/rtc*
> ls: cannot access '/dev/rtc*': No such file or directory
>
> The rtc is detected at address 0x32, but it's not claimed by any driver
(that would have been indicated by UU instead of 32).
> # i2cdetect -y 1
> 0 1 2 3 4 5 6 7 8 9 a b c d e f
> 00: -- -- -- -- -- -- -- -- -- -- -- -- --
> 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
> 30: -- -- 32 -- -- -- -- -- -- -- -- -- -- -- -- --
> 40: -- -- -- -- -- -- -- -- -- 49 4a -- -- -- -- --
> 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
> 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
> 70: -- -- -- -- -- -- -- --
>
> What did I miss?
>
> Kind regards,
> Cedric
Best regards,
Nobuhiro
Hi, it worked:
pi@raspberrypi:~ $ sudo -i
root@raspberrypi:~# echo rx8900 0x32 > /sys/class/i2c-adapter/i2c-1/new_device
Jul 1 17:17:32 raspberrypi kernel: i2c i2c-1: new_device: Instantiated device rx8900 at 0x32
Jul 1 17:17:32 raspberrypi kernel: rtc_rv8803: loading out-of-tree module taints kernel.
Jul 1 17:17:32 raspberrypi kernel: rtc-rv8803 1-0032: Voltage low, temperature compensation stopped.
Jul 1 17:17:32 raspberrypi kernel: rtc-rv8803 1-0032: Voltage low, data loss detected.
Jul 1 17:17:32 raspberrypi kernel: rtc-rv8803 1-0032: An alarm maybe have been missed.
Jul 1 17:17:32 raspberrypi kernel: rtc-rv8803 1-0032: Voltage low, data is invalid.
Jul 1 17:17:32 raspberrypi kernel: rtc-rv8803 1-0032: registered as rtc0
Jul 1 17:21:02 raspberrypi dhcpcd[430]: wlan0: hardware address 00:00:00:00:00:00 claims 10.93.128.58
root@raspberrypi:~# ls -l /dev/rtc0
crw------- 1 root root 252, 0 Jul 1 17:17 /dev/rtc0
root@raspberrypi:~# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- 29 -- -- -- -- -- --
30: -- -- UU -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- 49 4a -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@raspberrypi:~# hwclock -w
root@raspberrypi:~# hwclock -r
2021-07-01 17:29:37.223549+02:00
root@raspberrypi:~# hwclock -r
2021-07-01 17:29:49.788067+02:00
Thank you,
Cedric
________________________________________________________
Ihr Recht auf Privatsphäre. Schützen Sie Ihre Daten und wechseln jetzt zu eclipso Mail & Cloud - https://www.eclipso.de
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-07-01 12:50 rtc_rv8803.ko does not create a /dev/rtc?
2021-07-02 13:08 ` Nobuhiro Iwamatsu
[not found] ` <e565b6503bfcf0dcd704e2959640aee5@mail.eclipso.de>
2021-07-05 6:56 ` Fwd: "
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