cros_ec: Honor the google,remote-bus dt property

Boards where ECs that use a I2C port != 0 specify this in the
devicetree file via the google,remote-bus property.
Previously this was ignored and hardcoded to port 0.

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Heiko Schocher <hs@denx.de>
Cc: u-boot@lists.denx.de
Acked-by: Simon Glass <sjg@chromium.org>

drivers/i2c/cros_ec_tunnel.c

@@ -11,6 +11,12 @@
 #include <errno.h>
 #include <i2c.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
+struct cros_ec_i2c_bus {
+	int remote_bus;
+};
+
 static int cros_ec_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
 {
 	return 0;
@@ -19,7 +25,21 @@ static int cros_ec_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
 static int cros_ec_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
 			    int nmsgs)
 {
-	return cros_ec_i2c_tunnel(dev->parent, msg, nmsgs);
+	struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
+
+	return cros_ec_i2c_tunnel(dev->parent, i2c_bus->remote_bus, msg, nmsgs);
+}
+
+static int cros_ec_i2c_ofdata_to_platdata(struct udevice *dev)
+{
+	struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
+	const void *blob = gd->fdt_blob;
+	int node = dev->of_offset;
+
+	i2c_bus->remote_bus = fdtdec_get_uint(blob, node, "google,remote-bus",
+					      0);
+
+	return 0;
 }
 
 static const struct dm_i2c_ops cros_ec_i2c_ops = {
@@ -36,5 +56,7 @@ U_BOOT_DRIVER(cros_ec_tunnel) = {
 	.name	= "cros_ec_tunnel",
 	.id	= UCLASS_I2C,
 	.of_match = cros_ec_i2c_ids,
+	.ofdata_to_platdata = cros_ec_i2c_ofdata_to_platdata,
+	.priv_auto_alloc_size = sizeof(struct cros_ec_i2c_bus),
 	.ops	= &cros_ec_i2c_ops,
 };

drivers/misc/cros_ec.c

@@ -1058,7 +1058,8 @@ int cros_ec_decode_ec_flash(const void *blob, int node,
 	return 0;
 }
 
-int cros_ec_i2c_tunnel(struct udevice *dev, struct i2c_msg *in, int nmsgs)
+int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *in,
+		       int nmsgs)
 {
 	struct cros_ec_dev *cdev = dev_get_uclass_priv(dev);
 	union {
@@ -1078,7 +1079,7 @@ int cros_ec_i2c_tunnel(struct udevice *dev, struct i2c_msg *in, int nmsgs)
 	int rv;
 	int i;
 
-	p->port = 0;
+	p->port = port;
 
 	p->num_msgs = nmsgs;
 	size = sizeof(*p) + p->num_msgs * sizeof(*msg);

include/cros_ec.h

@@ -395,9 +395,11 @@ struct i2c_msg;
  * Tunnel an I2C transfer to the EC
  *
  * @param dev		CROS-EC device
+ * @param port		The remote port on EC to use
  * @param msg		List of messages to transfer
  * @param nmsgs		Number of messages to transfer
  */
-int cros_ec_i2c_tunnel(struct udevice *dev, struct i2c_msg *msg, int nmsgs);
+int cros_ec_i2c_tunnel(struct udevice *dev, int port, struct i2c_msg *msg,
+		       int nmsgs);
 
 #endif