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Add a compile time switch to distinguish between 7-bit and 8-bit I2C address

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usage. The comment in the code should explain the situation.

Discussed with:	 ian@
This commit is contained in:
andreast 2015-11-04 22:46:30 +00:00
parent b2d9de8ee8
commit 92a607efab
1 changed files with 8 additions and 2 deletions
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10
sys/dev/ofw/ofw_iicbus.c
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@ -148,10 +148,16 @@ ofw_iicbus_attach(device_t dev)
if (dinfo == NULL)
continue;
/*
* OFW uses 7-bit I2C address format (see ePAPR),
* but system expect 8-bit.
* FreeBSD drivers expect I2C addresses to be expressed as
* 8-bit values. Apple OFW data contains 8-bit values, but
* Linux FDT data contains 7-bit values, so shift them up to
* 8-bit format.
*/
#ifdef AIM
dinfo->opd_dinfo.addr = paddr;
#else
dinfo->opd_dinfo.addr = paddr << 1;
#endif
if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
0) {
free(dinfo, M_DEVBUF);