AM3352: Adding external EPSON RX8130CE driver to kernel 3.2

Devarun Kaushik

Part Number: AM3352

Hi,

I am trying to add EPSON RX8130CE to my eval board with AM3352 and have followed the steps as specified below.

1. Copy the file rtc-rx8130.c into the directory ./linux-3.8.x/drivers/rtc. "linux-3.8.x" refers to
the base of the linux kernel source tree.
2. Add the following lines into the drivers/rtc/Kconfig file:
config RTC_DRV_RX8130
tristate "Epson RX8130CE"
help
If you say yes here you get support for the Epson
RX8130CE RTC chips.
This driver can also be built as a module. If so, the module
will be called rtc-rx8130.
3. Add the following line to the drivers/rtc/Makefile:
obj-$(CONFIG_RTC_DRV_RX8130) += rtc-rx8130.o
4. During the rebuild, make sure to include the 'Epson RX8130CE' option in the Kernel
Configuration window under 'Device Drivers' -> 'Real Time Clock'.

Same is provided in the EPSON website in the RX8130_readme.pdf.

https://www5.epsondevice.com/en/information/support/linux_rtc/down_load.html

Only difference is I am adding the support for kernel 3.2.

So in order to support that, I have modified the rtc-rx8130.c as below

static int __init rx8130_rtc_init(void)

{

return i2c_add_driver(&rx8130_driver);

}

static void __exit rx8130_rtc_exit(void)

{

i2c_del_driver(&rx8130_driver);

}

module_init(rx8130_rtc_init);

module_exit(rx8130_rtc_exit);

from

module_i2c_driver(rx8130_driver);

2. RTC_VL_READ and RTC_VL_CLR is not supported in linux architecture for kernel 3.2 , I have commented that part of the code from the rtc-rx8130.c file.

So the problem I am facing is that the node /dev/rtc1 is not getting created as specified by Epson and my application code is not able to access the dev node.

Any help or direction to resolve this, will be great.

Thanks and regards,

Dev

over 6 years ago

0 Biser Gatchev-XID over 6 years ago

TI__Guru**** 393215 points

Hi,

Kernel v3.2 is obsolete since 4 years ago. It is no longer supported by TI.
Kernel v3.8 is not a TI release. It's a community release by www.beagleboard.org and is supported by the community there.

0 Devarun Kaushik over 6 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

Hi, thank you for the information. But can you please provide the steps required to add a new driver to kernel 3.2? As the system I developing on,are still presently using that version.

0 Bin Liu over 6 years ago

TI__Guru**** 175601 points

Hi,

Devarun Kaushik said:

Same is provided in the EPSON website in the RX8130_readme.pdf.

https://www5.epsondevice.com/en/information/support/linux_rtc/down_load.html

Only difference is I am adding the support for kernel 3.2.

Your question is really for EPSON, not TI. I recommend you ask the vendor for how to port their driver to kernel v3.2.

0 Devarun Kaushik over 6 years ago in reply to Bin Liu

Prodigy 30 points

Hi,
Was able to solve the issue. using the init and exit module APIs for kernel 3.2 worked. On top of that I had to configure the RTC slave address for i2c_board_info. Thanks for all the support. This epson RTC slave address is 0x32.

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AM3352: Adding external EPSON RX8130CE driver to kernel 3.2