[v8,6/8] OF: i2c: Add OF notifier handler
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Message ID 1414528565-10907-7-git-send-email-pantelis.antoniou@konsulko.com
State New, archived
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Series
  • Device Tree Overlays - 8th time's the charm
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Commit Message

Pantelis Antoniou Oct. 28, 2014, 8:36 p.m. UTC
Add OF notifier handler needed for creating/destroying i2c devices
according to dynamic runtime changes in the DT live tree.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
---
 drivers/i2c/i2c-core.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 78 insertions(+), 1 deletion(-)

Comments

Grant Likely Nov. 21, 2014, 1:53 a.m. UTC | #1
On Tue, 28 Oct 2014 22:36:03 +0200
, Pantelis Antoniou <pantelis.antoniou@konsulko.com>
 wrote:
> Add OF notifier handler needed for creating/destroying i2c devices
> according to dynamic runtime changes in the DT live tree.
> 
> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
> ---
>  drivers/i2c/i2c-core.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 78 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index e6da9d3..e751b78 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -1470,6 +1470,7 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
>  	return i2c_verify_adapter(dev);
>  }
>  EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
> +
>  #else
>  static void of_i2c_register_devices(struct i2c_adapter *adap) { }
>  #endif /* CONFIG_OF */
> @@ -1955,6 +1956,71 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
>  }
>  EXPORT_SYMBOL(i2c_clients_command);
>  
> +#if IS_ENABLED(CONFIG_OF)
> +
> +static int of_i2c_notify(struct notifier_block *nb,
> +				unsigned long action, void *arg)
> +{
> +	struct device_node *dn;
> +	struct i2c_adapter *adap;
> +	struct i2c_client *client;
> +	int state;
> +
> +	state = of_reconfig_get_state_change(action, arg);
> +	if (state == -1)
> +		return NOTIFY_OK;
> +
> +	switch (action) {
> +	case OF_RECONFIG_ATTACH_NODE:
> +	case OF_RECONFIG_DETACH_NODE:
> +		dn = arg;
> +		break;
> +	case OF_RECONFIG_ADD_PROPERTY:
> +	case OF_RECONFIG_REMOVE_PROPERTY:
> +	case OF_RECONFIG_UPDATE_PROPERTY:
> +		dn = ((struct of_prop_reconfig *)arg)->dn;
> +		break;
> +	default:
> +		return NOTIFY_OK;
> +	}
> +
> +	if (state) {
> +
> +		adap = of_find_i2c_adapter_by_node(dn->parent);
> +		if (adap == NULL)
> +			return NOTIFY_OK;	/* not for us */
> +
> +		client = of_i2c_register_device(adap, dn);
> +		put_device(&adap->dev);
> +
> +		if (IS_ERR(client)) {
> +			pr_err("%s: failed to create for '%s'\n",
> +					__func__, dn->full_name);
> +			return notifier_from_errno(PTR_ERR(client));
> +		}
> +
> +	} else {
> +
> +		/* find our device by node */
> +		client = of_find_i2c_device_by_node(dn);
> +		if (client == NULL)
> +			return NOTIFY_OK;	/* no? not meant for us */
> +
> +		/* unregister takes one ref away */
> +		i2c_unregister_device(client);
> +
> +		/* and put the reference of the find */
> +		put_device(&client->dev);
> +
> +	}

Nit: odd whitespace

> +
> +	return NOTIFY_OK;
> +}
> +
> +static struct notifier_block i2c_of_notifier;
> +
> +#endif
> +
>  static int __init i2c_init(void)
>  {
>  	int retval;
> @@ -1972,8 +2038,19 @@ static int __init i2c_init(void)
>  	retval = i2c_add_driver(&dummy_driver);
>  	if (retval)
>  		goto class_err;
> -	return 0;
>  
> +#if IS_ENABLED(CONFIG_OF)
> +	i2c_of_notifier.notifier_call = of_i2c_notify;
> +	retval = of_reconfig_notifier_register(&i2c_of_notifier);
> +	if (retval)
> +		goto notifier_err;
> +#endif
> +
> +	return 0;
> +#if IS_ENABLED(CONFIG_OF)
> +notifier_err:
> +	i2c_del_driver(&dummy_driver);
> +#endif

Similar to my comment on the platform bus, don't break the entire bus if
registration of the notifier fails. I would drop the error case and just
do a WARN_ON() if it fails.

Otherwise:

Acked-by: Grant Likely <grant.likely@linaro.org>

>  class_err:
>  #ifdef CONFIG_I2C_COMPAT
>  	class_compat_unregister(i2c_adapter_compat_class);
> -- 
> 1.7.12
> 

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Guenter Roeck Nov. 21, 2014, 2:03 a.m. UTC | #2
On 11/20/2014 05:53 PM, Grant Likely wrote:
> On Tue, 28 Oct 2014 22:36:03 +0200
> , Pantelis Antoniou <pantelis.antoniou@konsulko.com>
>   wrote:
>> Add OF notifier handler needed for creating/destroying i2c devices
>> according to dynamic runtime changes in the DT live tree.
>>
>> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
>> ---
>>   drivers/i2c/i2c-core.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++-
>>   1 file changed, 78 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
>> index e6da9d3..e751b78 100644
>> --- a/drivers/i2c/i2c-core.c
>> +++ b/drivers/i2c/i2c-core.c
>> @@ -1470,6 +1470,7 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
>>   	return i2c_verify_adapter(dev);
>>   }
>>   EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
>> +
>>   #else
>>   static void of_i2c_register_devices(struct i2c_adapter *adap) { }
>>   #endif /* CONFIG_OF */
>> @@ -1955,6 +1956,71 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
>>   }
>>   EXPORT_SYMBOL(i2c_clients_command);
>>
>> +#if IS_ENABLED(CONFIG_OF)
>> +
>> +static int of_i2c_notify(struct notifier_block *nb,
>> +				unsigned long action, void *arg)
>> +{
>> +	struct device_node *dn;
>> +	struct i2c_adapter *adap;
>> +	struct i2c_client *client;
>> +	int state;
>> +
>> +	state = of_reconfig_get_state_change(action, arg);
>> +	if (state == -1)
>> +		return NOTIFY_OK;
>> +
>> +	switch (action) {
>> +	case OF_RECONFIG_ATTACH_NODE:
>> +	case OF_RECONFIG_DETACH_NODE:
>> +		dn = arg;
>> +		break;
>> +	case OF_RECONFIG_ADD_PROPERTY:
>> +	case OF_RECONFIG_REMOVE_PROPERTY:
>> +	case OF_RECONFIG_UPDATE_PROPERTY:
>> +		dn = ((struct of_prop_reconfig *)arg)->dn;
>> +		break;
>> +	default:
>> +		return NOTIFY_OK;
>> +	}
>> +
>> +	if (state) {
>> +
>> +		adap = of_find_i2c_adapter_by_node(dn->parent);
>> +		if (adap == NULL)
>> +			return NOTIFY_OK;	/* not for us */
>> +
>> +		client = of_i2c_register_device(adap, dn);
>> +		put_device(&adap->dev);
>> +
>> +		if (IS_ERR(client)) {
>> +			pr_err("%s: failed to create for '%s'\n",
>> +					__func__, dn->full_name);
>> +			return notifier_from_errno(PTR_ERR(client));
>> +		}
>> +
>> +	} else {
>> +
>> +		/* find our device by node */
>> +		client = of_find_i2c_device_by_node(dn);
>> +		if (client == NULL)
>> +			return NOTIFY_OK;	/* no? not meant for us */
>> +
>> +		/* unregister takes one ref away */
>> +		i2c_unregister_device(client);
>> +
>> +		/* and put the reference of the find */
>> +		put_device(&client->dev);
>> +
>> +	}
>
> Nit: odd whitespace
>
>> +
>> +	return NOTIFY_OK;
>> +}
>> +
>> +static struct notifier_block i2c_of_notifier;
>> +
>> +#endif
>> +
>>   static int __init i2c_init(void)
>>   {
>>   	int retval;
>> @@ -1972,8 +2038,19 @@ static int __init i2c_init(void)
>>   	retval = i2c_add_driver(&dummy_driver);
>>   	if (retval)
>>   		goto class_err;
>> -	return 0;
>>
>> +#if IS_ENABLED(CONFIG_OF)
>> +	i2c_of_notifier.notifier_call = of_i2c_notify;

Wouldn't it be easier to just initialize i2c_of_notifier above instead of
here in the code ? Or is there a reason for doing it here ?

Thanks,
Guenter

>> +	retval = of_reconfig_notifier_register(&i2c_of_notifier);
>> +	if (retval)
>> +		goto notifier_err;
>> +#endif
>> +
>> +	return 0;
>> +#if IS_ENABLED(CONFIG_OF)
>> +notifier_err:
>> +	i2c_del_driver(&dummy_driver);
>> +#endif
>
> Similar to my comment on the platform bus, don't break the entire bus if
> registration of the notifier fails. I would drop the error case and just
> do a WARN_ON() if it fails.
>
> Otherwise:
>
> Acked-by: Grant Likely <grant.likely@linaro.org>
>
>>   class_err:
>>   #ifdef CONFIG_I2C_COMPAT
>>   	class_compat_unregister(i2c_adapter_compat_class);
>> --
>> 1.7.12
>>
>
>

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Grant Likely Nov. 21, 2014, 3:08 p.m. UTC | #3
On Thu, 20 Nov 2014 18:03:33 -0800
, Guenter Roeck <linux@roeck-us.net>
 wrote:
> On 11/20/2014 05:53 PM, Grant Likely wrote:
> > On Tue, 28 Oct 2014 22:36:03 +0200
> > , Pantelis Antoniou <pantelis.antoniou@konsulko.com>
> >   wrote:
> >> Add OF notifier handler needed for creating/destroying i2c devices
> >> according to dynamic runtime changes in the DT live tree.
> >>
> >> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
> >> ---
> >>   drivers/i2c/i2c-core.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++-
> >>   1 file changed, 78 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> >> index e6da9d3..e751b78 100644
> >> --- a/drivers/i2c/i2c-core.c
> >> +++ b/drivers/i2c/i2c-core.c
> >> @@ -1470,6 +1470,7 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
> >>   	return i2c_verify_adapter(dev);
> >>   }
> >>   EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
> >> +
> >>   #else
> >>   static void of_i2c_register_devices(struct i2c_adapter *adap) { }
> >>   #endif /* CONFIG_OF */
> >> @@ -1955,6 +1956,71 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
> >>   }
> >>   EXPORT_SYMBOL(i2c_clients_command);
> >>
> >> +#if IS_ENABLED(CONFIG_OF)
> >> +
> >> +static int of_i2c_notify(struct notifier_block *nb,
> >> +				unsigned long action, void *arg)
> >> +{
> >> +	struct device_node *dn;
> >> +	struct i2c_adapter *adap;
> >> +	struct i2c_client *client;
> >> +	int state;
> >> +
> >> +	state = of_reconfig_get_state_change(action, arg);
> >> +	if (state == -1)
> >> +		return NOTIFY_OK;
> >> +
> >> +	switch (action) {
> >> +	case OF_RECONFIG_ATTACH_NODE:
> >> +	case OF_RECONFIG_DETACH_NODE:
> >> +		dn = arg;
> >> +		break;
> >> +	case OF_RECONFIG_ADD_PROPERTY:
> >> +	case OF_RECONFIG_REMOVE_PROPERTY:
> >> +	case OF_RECONFIG_UPDATE_PROPERTY:
> >> +		dn = ((struct of_prop_reconfig *)arg)->dn;
> >> +		break;
> >> +	default:
> >> +		return NOTIFY_OK;
> >> +	}
> >> +
> >> +	if (state) {
> >> +
> >> +		adap = of_find_i2c_adapter_by_node(dn->parent);
> >> +		if (adap == NULL)
> >> +			return NOTIFY_OK;	/* not for us */
> >> +
> >> +		client = of_i2c_register_device(adap, dn);
> >> +		put_device(&adap->dev);
> >> +
> >> +		if (IS_ERR(client)) {
> >> +			pr_err("%s: failed to create for '%s'\n",
> >> +					__func__, dn->full_name);
> >> +			return notifier_from_errno(PTR_ERR(client));
> >> +		}
> >> +
> >> +	} else {
> >> +
> >> +		/* find our device by node */
> >> +		client = of_find_i2c_device_by_node(dn);
> >> +		if (client == NULL)
> >> +			return NOTIFY_OK;	/* no? not meant for us */
> >> +
> >> +		/* unregister takes one ref away */
> >> +		i2c_unregister_device(client);
> >> +
> >> +		/* and put the reference of the find */
> >> +		put_device(&client->dev);
> >> +
> >> +	}
> >
> > Nit: odd whitespace
> >
> >> +
> >> +	return NOTIFY_OK;
> >> +}
> >> +
> >> +static struct notifier_block i2c_of_notifier;
> >> +
> >> +#endif
> >> +
> >>   static int __init i2c_init(void)
> >>   {
> >>   	int retval;
> >> @@ -1972,8 +2038,19 @@ static int __init i2c_init(void)
> >>   	retval = i2c_add_driver(&dummy_driver);
> >>   	if (retval)
> >>   		goto class_err;
> >> -	return 0;
> >>
> >> +#if IS_ENABLED(CONFIG_OF)
> >> +	i2c_of_notifier.notifier_call = of_i2c_notify;
> 
> Wouldn't it be easier to just initialize i2c_of_notifier above instead of
> here in the code ? Or is there a reason for doing it here ?

Yes, absolutely. This code should also depend on CONFIG_OF_DYNAMIC too,
not merely CONFIG_OF.

> 
> Thanks,
> Guenter
> 
> >> +	retval = of_reconfig_notifier_register(&i2c_of_notifier);
> >> +	if (retval)
> >> +		goto notifier_err;
> >> +#endif

We can also get rid of the ugly #ifdef in the body by creating empty
stubs for of_reconfig_notify_{register,unregister}() and doing the
following:

	if (IS_ENABLED(CONFIG_OF_DYNAMIC))
		WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier))

I picked up the patch into my tree and made the above changes because
they're pretty trivial. If Wolfram is okay with it then I can take the
whole series through my tree. Otherwise I'll put the of_reconfig_* empty
stubs into a separate branch that he and broonie can both pull.

g.

> >> +
> >> +	return 0;
> >> +#if IS_ENABLED(CONFIG_OF)
> >> +notifier_err:
> >> +	i2c_del_driver(&dummy_driver);
> >> +#endif
> >
> > Similar to my comment on the platform bus, don't break the entire bus if
> > registration of the notifier fails. I would drop the error case and just
> > do a WARN_ON() if it fails.
> >
> > Otherwise:
> >
> > Acked-by: Grant Likely <grant.likely@linaro.org>
> >
> >>   class_err:
> >>   #ifdef CONFIG_I2C_COMPAT
> >>   	class_compat_unregister(i2c_adapter_compat_class);
> >> --
> >> 1.7.12
> >>
> >
> >
> 
> --
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> the body of a message to majordomo@vger.kernel.org
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Pantelis Antoniou Nov. 21, 2014, 3:11 p.m. UTC | #4
Hi Grant,

> On Nov 21, 2014, at 17:08 , Grant Likely <grant.likely@secretlab.ca> wrote:
> 
> On Thu, 20 Nov 2014 18:03:33 -0800
> , Guenter Roeck <linux@roeck-us.net>
> wrote:
>> On 11/20/2014 05:53 PM, Grant Likely wrote:
>>> On Tue, 28 Oct 2014 22:36:03 +0200
>>> , Pantelis Antoniou <pantelis.antoniou@konsulko.com>
>>>  wrote:
>>>> Add OF notifier handler needed for creating/destroying i2c devices
>>>> according to dynamic runtime changes in the DT live tree.
>>>> 
>>>> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
>>>> ---
>>>>  drivers/i2c/i2c-core.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++-
>>>>  1 file changed, 78 insertions(+), 1 deletion(-)
>>>> 
>>>> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
>>>> index e6da9d3..e751b78 100644
>>>> --- a/drivers/i2c/i2c-core.c
>>>> +++ b/drivers/i2c/i2c-core.c
>>>> @@ -1470,6 +1470,7 @@ struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
>>>>  	return i2c_verify_adapter(dev);
>>>>  }
>>>>  EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
>>>> +
>>>>  #else
>>>>  static void of_i2c_register_devices(struct i2c_adapter *adap) { }
>>>>  #endif /* CONFIG_OF */
>>>> @@ -1955,6 +1956,71 @@ void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
>>>>  }
>>>>  EXPORT_SYMBOL(i2c_clients_command);
>>>> 
>>>> +#if IS_ENABLED(CONFIG_OF)
>>>> +
>>>> +static int of_i2c_notify(struct notifier_block *nb,
>>>> +				unsigned long action, void *arg)
>>>> +{
>>>> +	struct device_node *dn;
>>>> +	struct i2c_adapter *adap;
>>>> +	struct i2c_client *client;
>>>> +	int state;
>>>> +
>>>> +	state = of_reconfig_get_state_change(action, arg);
>>>> +	if (state == -1)
>>>> +		return NOTIFY_OK;
>>>> +
>>>> +	switch (action) {
>>>> +	case OF_RECONFIG_ATTACH_NODE:
>>>> +	case OF_RECONFIG_DETACH_NODE:
>>>> +		dn = arg;
>>>> +		break;
>>>> +	case OF_RECONFIG_ADD_PROPERTY:
>>>> +	case OF_RECONFIG_REMOVE_PROPERTY:
>>>> +	case OF_RECONFIG_UPDATE_PROPERTY:
>>>> +		dn = ((struct of_prop_reconfig *)arg)->dn;
>>>> +		break;
>>>> +	default:
>>>> +		return NOTIFY_OK;
>>>> +	}
>>>> +
>>>> +	if (state) {
>>>> +
>>>> +		adap = of_find_i2c_adapter_by_node(dn->parent);
>>>> +		if (adap == NULL)
>>>> +			return NOTIFY_OK;	/* not for us */
>>>> +
>>>> +		client = of_i2c_register_device(adap, dn);
>>>> +		put_device(&adap->dev);
>>>> +
>>>> +		if (IS_ERR(client)) {
>>>> +			pr_err("%s: failed to create for '%s'\n",
>>>> +					__func__, dn->full_name);
>>>> +			return notifier_from_errno(PTR_ERR(client));
>>>> +		}
>>>> +
>>>> +	} else {
>>>> +
>>>> +		/* find our device by node */
>>>> +		client = of_find_i2c_device_by_node(dn);
>>>> +		if (client == NULL)
>>>> +			return NOTIFY_OK;	/* no? not meant for us */
>>>> +
>>>> +		/* unregister takes one ref away */
>>>> +		i2c_unregister_device(client);
>>>> +
>>>> +		/* and put the reference of the find */
>>>> +		put_device(&client->dev);
>>>> +
>>>> +	}
>>> 
>>> Nit: odd whitespace
>>> 
>>>> +
>>>> +	return NOTIFY_OK;
>>>> +}
>>>> +
>>>> +static struct notifier_block i2c_of_notifier;
>>>> +
>>>> +#endif
>>>> +
>>>>  static int __init i2c_init(void)
>>>>  {
>>>>  	int retval;
>>>> @@ -1972,8 +2038,19 @@ static int __init i2c_init(void)
>>>>  	retval = i2c_add_driver(&dummy_driver);
>>>>  	if (retval)
>>>>  		goto class_err;
>>>> -	return 0;
>>>> 
>>>> +#if IS_ENABLED(CONFIG_OF)
>>>> +	i2c_of_notifier.notifier_call = of_i2c_notify;
>> 
>> Wouldn't it be easier to just initialize i2c_of_notifier above instead of
>> here in the code ? Or is there a reason for doing it here ?
> 
> Yes, absolutely. This code should also depend on CONFIG_OF_DYNAMIC too,
> not merely CONFIG_OF.
> 
>> 

No reason; it just seemed like the most opportune place to put it at the time.

>> Thanks,
>> Guenter
>> 
>>>> +	retval = of_reconfig_notifier_register(&i2c_of_notifier);
>>>> +	if (retval)
>>>> +		goto notifier_err;
>>>> +#endif
> 
> We can also get rid of the ugly #ifdef in the body by creating empty
> stubs for of_reconfig_notify_{register,unregister}() and doing the
> following:
> 
> 	if (IS_ENABLED(CONFIG_OF_DYNAMIC))
> 		WARN_ON(of_reconfig_notifier_register(&i2c_of_notifier))
> 
> I picked up the patch into my tree and made the above changes because
> they're pretty trivial. If Wolfram is okay with it then I can take the
> whole series through my tree. Otherwise I'll put the of_reconfig_* empty
> stubs into a separate branch that he and broonie can both pull.
> 

I’m fine with doing this if you’d like, it’s pretty simple.

Regards

— Pantelis

> g.
> 
>>>> +
>>>> +	return 0;
>>>> +#if IS_ENABLED(CONFIG_OF)
>>>> +notifier_err:
>>>> +	i2c_del_driver(&dummy_driver);
>>>> +#endif
>>> 
>>> Similar to my comment on the platform bus, don't break the entire bus if
>>> registration of the notifier fails. I would drop the error case and just
>>> do a WARN_ON() if it fails.
>>> 
>>> Otherwise:
>>> 
>>> Acked-by: Grant Likely <grant.likely@linaro.org>
>>> 
>>>>  class_err:
>>>>  #ifdef CONFIG_I2C_COMPAT
>>>>  	class_compat_unregister(i2c_adapter_compat_class);
>>>> --
>>>> 1.7.12
>>>> 
>>> 
>>> 
>> 
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Wolfram Sang Nov. 23, 2014, 4:23 p.m. UTC | #5
> I picked up the patch into my tree and made the above changes because
> they're pretty trivial. If Wolfram is okay with it then I can take the
> whole series through my tree. Otherwise I'll put the of_reconfig_* empty
> stubs into a separate branch that he and broonie can both pull.

With your fix applied and in case of targetting 3.19:

Reviewed-by: Wolfram Sang <wsa@the-dreams.de>

Patch
diff mbox series

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e6da9d3..e751b78 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1470,6 +1470,7 @@  struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
 	return i2c_verify_adapter(dev);
 }
 EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
+
 #else
 static void of_i2c_register_devices(struct i2c_adapter *adap) { }
 #endif /* CONFIG_OF */
@@ -1955,6 +1956,71 @@  void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
 }
 EXPORT_SYMBOL(i2c_clients_command);
 
+#if IS_ENABLED(CONFIG_OF)
+
+static int of_i2c_notify(struct notifier_block *nb,
+				unsigned long action, void *arg)
+{
+	struct device_node *dn;
+	struct i2c_adapter *adap;
+	struct i2c_client *client;
+	int state;
+
+	state = of_reconfig_get_state_change(action, arg);
+	if (state == -1)
+		return NOTIFY_OK;
+
+	switch (action) {
+	case OF_RECONFIG_ATTACH_NODE:
+	case OF_RECONFIG_DETACH_NODE:
+		dn = arg;
+		break;
+	case OF_RECONFIG_ADD_PROPERTY:
+	case OF_RECONFIG_REMOVE_PROPERTY:
+	case OF_RECONFIG_UPDATE_PROPERTY:
+		dn = ((struct of_prop_reconfig *)arg)->dn;
+		break;
+	default:
+		return NOTIFY_OK;
+	}
+
+	if (state) {
+
+		adap = of_find_i2c_adapter_by_node(dn->parent);
+		if (adap == NULL)
+			return NOTIFY_OK;	/* not for us */
+
+		client = of_i2c_register_device(adap, dn);
+		put_device(&adap->dev);
+
+		if (IS_ERR(client)) {
+			pr_err("%s: failed to create for '%s'\n",
+					__func__, dn->full_name);
+			return notifier_from_errno(PTR_ERR(client));
+		}
+
+	} else {
+
+		/* find our device by node */
+		client = of_find_i2c_device_by_node(dn);
+		if (client == NULL)
+			return NOTIFY_OK;	/* no? not meant for us */
+
+		/* unregister takes one ref away */
+		i2c_unregister_device(client);
+
+		/* and put the reference of the find */
+		put_device(&client->dev);
+
+	}
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block i2c_of_notifier;
+
+#endif
+
 static int __init i2c_init(void)
 {
 	int retval;
@@ -1972,8 +2038,19 @@  static int __init i2c_init(void)
 	retval = i2c_add_driver(&dummy_driver);
 	if (retval)
 		goto class_err;
-	return 0;
 
+#if IS_ENABLED(CONFIG_OF)
+	i2c_of_notifier.notifier_call = of_i2c_notify;
+	retval = of_reconfig_notifier_register(&i2c_of_notifier);
+	if (retval)
+		goto notifier_err;
+#endif
+
+	return 0;
+#if IS_ENABLED(CONFIG_OF)
+notifier_err:
+	i2c_del_driver(&dummy_driver);
+#endif
 class_err:
 #ifdef CONFIG_I2C_COMPAT
 	class_compat_unregister(i2c_adapter_compat_class);