Re: [rtc-linux] Re: i2c/rtc init dependency problem

[Jon Ringle <jon-7zJyie9iPacdnm+yROfE0A@public.gmane.org>]

Alexander:

On Fri, Sep 25, 2009 at 10:49 AM, Jon Ringle <jon-7zJyie9iPacdnm+yROfE0A@public.gmane.org> wrote:
> However, it still does not work with your patch. In the dump below I see:
> [    0.250000] i2c-core: driver [dummy] registered
> ...
> [    0.290000] i2c-adapter i2c-0: adapter [IOP3xx-I2C] registered
> ...
> [    3.780000] i2c-core: driver [rtc-m41t80] registered
[Note: missing i2c-adapter i2c-0 debug msgs expected when rtc-m41t80 probe]
> [    3.790000] i2c /dev entries driver
> [    3.790000] i2c-core: driver [dev_driver] registered
> [    3.800000] i2c-dev: adapter [IOP3xx-I2C] registered as minor 0
> [    3.800000] i2c-core: driver [lm75] registered
> [    3.830000] i2c-adapter i2c-0: found normal entry for adapter 0, addr 0x48
> ...
> [    4.050000] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)

I think the problem is that rtc-m41t80 does not provide either of the following:
    struct i2c_driver: detect and address_data (both are null)
as required by i2c_detect()
  -> called by __attach_adapter()
  -> called by i2c_register_driver()
  -> called by i2c_add_driver()
  -> called by m41t80_rtc_init()

*or*
    struct i2c_driver: attach_adapter (null)
as required by __attach_adapter()
  -> called by i2c_register_driver()
  -> called by i2c_add_driver()
  -> called by m41t80_rtc_init()

Jon