Allow i2c bus speed to be configured via hints, FDT data, and sysctl.

The current support for controlling i2c bus speed is an inconsistant mess.
There are 4 symbolic speed values defined, UNKNOWN, SLOW, FAST, FASTEST.
It seems to be universally assumed that SLOW means the standard 100KHz
rate from the original spec.  Nothing ever calls iicbus_reset() with a
speed of FAST, although some drivers would treat it as the 400KHz standard
speed.  Mostly iicbus_reset() is called with the speed set to UNKNOWN or
FASTEST, and there's really no telling what any individual driver will do
with those.

The speed of an i2c bus is limited by the speed of the slowest device on
the bus.  This means that generally the bus speed needs to be configured
based on the board/system and the components within it.  Historically for
i2c we've configured with device hints.  Newer systems use FDT data and it
documents a clock-frequency property for i2c busses.  Hobbyists and
developers are likely to want on the fly changes.  These changes provide
all 3 methods, but do not require any existing drivers to change to use
the new facilities.

This adds an iicbus method, iicbus_get_frequency(dev, speed) that gets the
frequency for the requested symbolic speed.  If the symbolic speed is SLOW
or if there is no speed configured for the bus, the returned value is
100KHz, always.  Otherwise, if bus speed is configured by hints, fdt,
tunable, or sysctl, that speed is returned.  It also adds a helper
function, iicbus_init_frequency() that any bus driver subclassed from
iicbus can initialize the frequency from some other source of info.

Initial driver implementations are provided for Freescale and TI.

Differential Revision:        https://reviews.freebsd.org/D1174
PR:		195009

1 files changed, 3 insertions, 1 deletions

diff --git a/sys/dev/iicbus/iicbus.h b/sys/dev/iicbus/iicbus.h
index 54fe980..b5905ad 100644
--- a/sys/dev/iicbus/iicbus.h
+++ b/sys/dev/iicbus/iicbus.h
@@ -44,6 +44,7 @@ struct iicbus_softc
 	u_char strict;		/* deny operations that violate the
 				 * I2C protocol */
 	struct mtx lock;
+	u_int bus_freq;		/* Configured bus Hz. */
 };
 
 struct iicbus_ivar
@@ -67,7 +68,8 @@ IICBUS_ACCESSOR(nostop,		NOSTOP,		bool)
 #define	IICBUS_UNLOCK(sc)      		mtx_unlock(&(sc)->lock)
 #define	IICBUS_ASSERT_LOCKED(sc)       	mtx_assert(&(sc)->lock, MA_OWNED)
 
-extern int iicbus_generic_intr(device_t dev, int event, char *buf);
+int  iicbus_generic_intr(device_t dev, int event, char *buf);
+void iicbus_init_frequency(device_t dev, u_int bus_freq);
 
 extern driver_t iicbus_driver;
 extern devclass_t iicbus_devclass;