Commit b2edcdae authored by Wolfram Sang's avatar Wolfram Sang
Browse files

Merge tag 'tegra-for-4.8-i2c' of... 

Merge tag 'tegra-for-4.8-i2c' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux

 into i2c/for-next

[wsa: fell through the cracks, applied to 4.9 now]

Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>

i2c: 'i2c-bus' node support for v4.8-rc1

This includes the device tree binding and I2C core changes to support
the i2c-bus subnode that I2C masters can use to describe their slaves
in a separate namespace and therefore avoid clashing with potentially
other subnodes.
parents 74f47f07 7e4c224a

Documentation/devicetree/bindings/i2c/i2c.txt

+8 −0
Original line number Diff line number Diff line
@@ -32,6 +32,14 @@ wants to support one of the below features, it should adapt the bindings below. 
- clock-frequency

	frequency of bus clock in Hz.



- i2c-bus

	For I2C adapters that have child nodes that are a mixture of both I2C

	devices and non-I2C devices, the 'i2c-bus' subnode can be used for

	populating I2C devices. If the 'i2c-bus' subnode is present, only

	subnodes of this will be considered as I2C slaves. The properties,

	'#address-cells' and '#size-cells' must be defined under this subnode

	if present.



- i2c-scl-falling-time-ns

	Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C

	specification.

drivers/i2c/i2c-core.c

+8 −2
Original line number Diff line number Diff line
@@ -1680,7 +1680,7 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap, 


static void of_i2c_register_devices(struct i2c_adapter *adap)

{

	struct device_node *node;

	struct device_node *bus, *node;



	/* Only register child devices if the adapter has a node pointer set */

	if (!adap->dev.of_node)
@@ -1688,11 +1688,17 @@ static void of_i2c_register_devices(struct i2c_adapter *adap) 


	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");



	for_each_available_child_of_node(adap->dev.of_node, node) {

	bus = of_get_child_by_name(adap->dev.of_node, "i2c-bus");

	if (!bus)

		bus = of_node_get(adap->dev.of_node);



	for_each_available_child_of_node(bus, node) {

		if (of_node_test_and_set_flag(node, OF_POPULATED))

			continue;

		of_i2c_register_device(adap, node);

	}



	of_node_put(bus);

}



static int of_dev_node_match(struct device *dev, void *data)

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