36 lines
1.3 KiB
Diff
36 lines
1.3 KiB
Diff
From 798407c217fee8f4869bf76d9cd2cda16f93e24f 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
|
|
@@ -445,7 +445,9 @@ 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;
|