Date: Tue, 06 Mar 2007 18:09:09 +0200 From: Krassimir Slavchev <krassi@bulinfo.net> To: "M. Warner Losh" <imp@bsdimp.com> Cc: freebsd-arm@freebsd.org Subject: Re: IIC support? Message-ID: <45ED9225.1070704@bulinfo.net> In-Reply-To: <20070305.074920.-1090027333.imp@bsdimp.com> References: <45EC2667.9040004@bulinfo.net> <20070305.072919.2010473806.imp@bsdimp.com> <45EC2BF9.2000804@bulinfo.net> <20070305.074920.-1090027333.imp@bsdimp.com>
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M. Warner Losh wrote: > In message: <45EC2BF9.2000804@bulinfo.net> > Krassimir Slavchev <krassi@bulinfo.net> writes: > : M. Warner Losh wrote: > : > In message: <45EC2667.9040004@bulinfo.net> > : > Krassimir Slavchev <krassi@bulinfo.net> writes: > : > : Warner Losh wrote: > : > : >> I have problems to access the iic eeprom from userland. Even after set > : > : >> SCAN_IICBUS in iicbus.c nothing has been detected. I have made some > : > : >> tests from the bootloader to read/write from/to the eeprom and they work. > : > : >> Is there any known problems with TWI or any differences between board > : > : >> settings? > : > : >> > : > : > > : > : > The IIC bus is not a self enumerating bus. Bad things happen when you > : > : > go out and try to 'probe' it, although often you can get away with > : > : > that. FreeBSD takes a conservative approach. You need hints for each > : > : > iic device on bus that you have on your board. > : > : > > : > : > > : > : Ok, that was just for testing. > : > : > : > : I am trying to write a driver for pcf8563 (RTC similar to ds1672) but > : > : when I call the iicbus_transfer() function the iicbus_transfer_gen() is > : > : called instead of at91_twi_transfer(). > : > : In the kernel config file I have: > : > : ... > : > : device at91_twi > : > : device iicbus > : > : ... > : > : > : > : Is this correct or I miss something else? > : > > : > Should be correct. What version of FreeBSD are you using? > : > > : 7.0-CURRENT, 2 days old > > OK. I'll take a look to see if there are unmerged patches from p4. > I'm nearly positive that I fixed this... > > When iicbus_transfer() is called with parent device then the right function is called. If this is correct then ds1672 and ad7418 drivers should be corrected. > Warner > > Best Regards
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