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| author | Wolfram Sang <wsa@the-dreams.de> | 2016-10-11 23:26:13 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-10-11 23:37:26 +0200 |
| commit | b2edcdae3d9a29b25f6c161a8711caa74ce49991 (patch) | |
| tree | 010bb73a88b60fb40dd7731d7059979f51ce57f0 | |
| parent | 74f47f07e53daeca1d16812fa7c9bf3145bd8216 (diff) | |
| parent | 7e4c224abfe8e2a00f56a2ef0198e6de3ca1852c (diff) | |
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: Wolfram 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.
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c.txt | 8 | ||||
| -rw-r--r-- | drivers/i2c/i2c-core.c | 10 |
2 files changed, 16 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt index f31b2ad1552b..5fa691e6f638 100644 --- a/Documentation/devicetree/bindings/i2c/i2c.txt +++ b/Documentation/devicetree/bindings/i2c/i2c.txt @@ -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. diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 98fffa3a09f7..5ab67219f71e 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -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) |