From 9b9387247f8f43f4eaf56b306c844cc61cd41c40 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Tue, 20 Feb 2018 10:07:27 +0000
Subject: [PATCH] i2c-gpio: Also set bus numbers from reg property

I2C busses can be assigned specific bus numbers using aliases in
Device Tree - string properties where the name is the alias and the
value is the path to the node. The current DT parameter mechanism
does not allow property names to be derived from a parameter value
in any way, so it isn't possible to generate unique or matching
aliases for nodes from an overlay that can generate multiple
instances, e.g. i2c-gpio.

Work around this limitation (at least temporarily) by allowing
the i2c adapter number to be initialised from the "reg" property
if present.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 drivers/i2c/busses/i2c-gpio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-gpio.c
+++ b/drivers/i2c/busses/i2c-gpio.c
@@ -428,7 +428,9 @@ static int i2c_gpio_probe(struct platfor
 	adap->dev.parent = dev;
 	device_set_node(&adap->dev, fwnode);
 
-	adap->nr = pdev->id;
+	if (pdev->id != PLATFORM_DEVID_NONE || !pdev->dev.of_node ||
+	    of_property_read_u32(pdev->dev.of_node, "reg", &adap->nr))
+		adap->nr = pdev->id;
 	ret = i2c_bit_add_numbered_bus(adap);
 	if (ret)
 		return ret;
