[RFC PATCH 08/13] i2c: core: Add support for 'i2c-bus' subnode

[Thierry Reding]

On Fri, Jun 17, 2016 at 01:03:42PM +0100, Jon Hunter wrote:
> If the 'i2c-bus' device-tree node is present for an I2C adapter then
> parse this subnode for I2C slaves.
> 
> Signed-off-by: Jon Hunter <jonathanh at nvidia.com>
> ---
>  drivers/i2c/i2c-core.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index 952d2f0c02c5..f552d97bad32 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1452,7 +1452,7 @@ 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)
> @@ -1460,11 +1460,18 @@ 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 = adap->dev.of_node;

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

here...

> +
> +	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);
>  	}
> +
> +	if (bus != adap->dev.of_node)
> +		of_node_put(bus);

... and drop the extra check here?

Thierry
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