From bf17755477a20152e952001f4b91b8def4bd85a2 Mon Sep 17 00:00:00 2001
From: Luiz Otavio O Souza <loos@FreeBSD.org>
Date: Thu, 13 Feb 2014 18:22:49 +0000
Subject: [PATCH] Allow the use of OFW I2C bus together with iicbb(4) on
 OFW-based systems.

This change makes ofw_iicbus attach to iicbb(4) controllers in addition to
the already supported i2c host bridges (iichb).

On iicbb(4) allow the direct access of the OFW parent node by its children,
so they can be directly attached to iicbb(4) node on the DTS without the
need of describing the i2c bus.

Approved by:	adrian (mentor, implicit)
---
 sys/dev/iicbus/iicbb.c   | 25 +++++++++++++++++++++++++
 sys/dev/ofw/ofw_iicbus.c |  1 +
 2 files changed, 26 insertions(+)

diff --git a/sys/dev/iicbus/iicbb.c b/sys/dev/iicbus/iicbb.c
index 44a069f5e35d..977d52a01249 100644
--- a/sys/dev/iicbus/iicbb.c
+++ b/sys/dev/iicbus/iicbb.c
@@ -43,6 +43,8 @@ __FBSDID("$FreeBSD$");
  *
  */
 
+#include "opt_platform.h"
+
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
@@ -50,6 +52,11 @@ __FBSDID("$FreeBSD$");
 #include <sys/bus.h>
 #include <sys/uio.h>
 
+#ifdef FDT
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/fdt/fdt_common.h>
+#endif
 
 #include <dev/iicbus/iiconf.h>
 #include <dev/iicbus/iicbus.h>
@@ -77,6 +84,9 @@ static int iicbb_write(device_t, const char *, int, int *, int);
 static int iicbb_read(device_t, char *, int, int *, int, int);
 static int iicbb_reset(device_t, u_char, u_char, u_char *);
 static int iicbb_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs);
+#ifdef FDT
+static phandle_t iicbb_get_node(device_t, device_t);
+#endif
 
 static device_method_t iicbb_methods[] = {
 	/* device interface */
@@ -98,6 +108,11 @@ static device_method_t iicbb_methods[] = {
 	DEVMETHOD(iicbus_reset,		iicbb_reset),
 	DEVMETHOD(iicbus_transfer,	iicbb_transfer),
 
+#ifdef FDT
+	/* ofw_bus interface */
+	DEVMETHOD(ofw_bus_get_node,	iicbb_get_node),
+#endif
+
 	{ 0, 0 }
 };
 
@@ -154,6 +169,16 @@ iicbb_detach(device_t dev)
 	return (0);
 }
 
+#ifdef FDT
+static phandle_t
+iicbb_get_node(device_t bus, device_t dev)
+{
+
+	/* We only have one child, the I2C bus, which needs our own node. */
+	return (ofw_bus_get_node(bus));
+}
+#endif
+
 static void
 iicbb_child_detached( device_t dev, device_t child )
 {
diff --git a/sys/dev/ofw/ofw_iicbus.c b/sys/dev/ofw/ofw_iicbus.c
index 965721a8714d..1574f6e9674a 100644
--- a/sys/dev/ofw/ofw_iicbus.c
+++ b/sys/dev/ofw/ofw_iicbus.c
@@ -80,6 +80,7 @@ static devclass_t ofwiicbus_devclass;
 
 DEFINE_CLASS_1(iicbus, ofw_iicbus_driver, ofw_iicbus_methods,
     sizeof(struct iicbus_softc), iicbus_driver);
+DRIVER_MODULE(ofw_iicbus, iicbb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0);
 DRIVER_MODULE(ofw_iicbus, iichb, ofw_iicbus_driver, ofwiicbus_devclass, 0, 0);
 MODULE_VERSION(ofw_iicbus, 1);
 MODULE_DEPEND(ofw_iicbus, iicbus, 1, 1, 1);