[PATCH] i2c: implement detect callback for virtual adapter device as well

[Marco Felsch]

Hi Ahmad,

On 23-01-25, Ahmad Fatoum wrote:
> For MMCs, we already support detect on both the hardware device and the
> mmcX virtual device. Let's do the same for i2c, so users have the option
> to do `detect i2c0` instead of `detect 30a30000.i2c at 30a30000.of`.

nice :)

> `detect -a` still works as expected, as the detect callback is a no-op
> if everything on the bus is already registered.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

Reviewed-by: Marco Felsch <m.felsch at pengutronix.de>

> ---
>  drivers/i2c/i2c.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/i2c.c b/drivers/i2c/i2c.c
> index 7e1cea49f3b6..4ecf7bb163e6 100644
> --- a/drivers/i2c/i2c.c
> +++ b/drivers/i2c/i2c.c
> @@ -472,6 +472,14 @@ int of_i2c_register_devices_by_node(struct device_node *node)
>  }
>  
>  static int i2c_bus_detect(struct device *dev)
> +{
> +	struct i2c_adapter *adap = container_of(dev, struct i2c_adapter, dev);
> +
> +	of_i2c_register_devices(adap);
> +	return 0;
> +}
> +
> +static int i2c_hw_detect(struct device *dev)
>  {
>  	struct i2c_adapter *adap;
>  
> @@ -712,6 +720,7 @@ int i2c_add_numbered_adapter(struct i2c_adapter *adapter)
>  	}
>  
>  	adapter->dev.id = adapter->nr;
> +	adapter->dev.detect = i2c_bus_detect;
>  	dev_set_name(&adapter->dev, "i2c");
>  
>  	ret = register_device(&adapter->dev);
> @@ -726,8 +735,8 @@ int i2c_add_numbered_adapter(struct i2c_adapter *adapter)
>  	hw_dev = adapter->dev.parent;
>  	if (hw_dev && dev_of_node(hw_dev)) {
>  		if (!hw_dev->detect)
> -			hw_dev->detect = i2c_bus_detect;
> -		i2c_bus_detect(hw_dev);
> +			hw_dev->detect = i2c_hw_detect;
> +		i2c_hw_detect(hw_dev);
>  	}
>  
>  	return 0;
> -- 
> 2.30.2
> 
> 
>