From 41ee5de43fef1fb44219a5bb7099af028d241670 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Tue, 20 Feb 2018 10:07:27 +0000 Subject: [PATCH 223/454] 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 --- 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 @@ -223,7 +223,9 @@ static int i2c_gpio_probe(struct platfor adap->dev.parent = &pdev->dev; adap->dev.of_node = pdev->dev.of_node; - 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;