1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0120-i2c-gpio-Also-set-bus-numbers-from-reg-property.patch b/target/linux/brcm2708/patches-4.19/950-0120-i2c-gpio-Also-set-bus-numbers-from-reg-property.patch
new file mode 100644
index 0000000000..6103e82d88
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0120-i2c-gpio-Also-set-bus-numbers-from-reg-property.patch
@@ -0,0 +1,35 @@
+From b7e22249959b8111e3d8fe7a78afa6a7b0420350 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
+@@ -350,7 +350,9 @@ static int i2c_gpio_probe(struct platfor
+ 	adap->dev.parent = dev;
+ 	adap->dev.of_node = np;
+ 
+-	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;