[PATCH v3 0/2] pixcir_i2c_ts: Add optional wakeup irq support

[PATCH v3 0/2] pixcir_i2c_ts: Add optional wakeup irq support

[Vignesh R]

This is the v3 of the patch series to add optional wake irq support for
pixcir_i2c_tsc.

Tested on am437x-gp-evm, with some out of tree patches to support
suspend/resume on am437x.


Vignesh R (2):
  input: touchscreen: pixcir_i2c_ts: Add support for optional wakeup
    interrupt
  ARM: dts: am437x-gp-evm: Add wakeup interrupt source for
    pixcir_i2c_tsc

 arch/arm/boot/dts/am437x-gp-evm.dts       |  4 ++++
 drivers/input/touchscreen/pixcir_i2c_ts.c | 22 ++++++++++++++++++----
 include/linux/input/pixcir_ts.h           |  1 +
 3 files changed, 23 insertions(+), 4 deletions(-)

-- 
2.4.5

[PATCH v3 1/2] input: touchscreen: pixcir_i2c_ts: Add support for optional wakeup interrupt

[Vignesh R]

On am437x-gp-evm, pixcir touchscreen can wake the system from low power
state by generating wake-up interrupt via pinctrl and IO daisy chain.
Add support for optional wakeup interrupt source by regsitering to
automated wake IRQ framework introduced by commit 4990d4fe327b ("PM /
Wakeirq: Add automated device wake IRQ handling").
This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add
support for optional wake-up")

Signed-off-by: Vignesh R <vigneshr@ti.com>
---

v3:
 * handle error code returned by of_irq_get_byname()

v2:
 * use of_irq_get_byname()
 * remove enable/disable_wake_irq()

 drivers/input/touchscreen/pixcir_i2c_ts.c | 22 ++++++++++++++++++----
 include/linux/input/pixcir_ts.h           |  1 +
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 8f3e243a62bf..3a4ab358bf52 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -29,6 +29,8 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pm_wakeirq.h>
 
 #define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
 
@@ -364,8 +366,6 @@ static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
 				goto unlock;
 			}
 		}
-
-		enable_irq_wake(client->irq);
 	} else if (input->users) {
 		ret = pixcir_stop(ts);
 	}
@@ -386,8 +386,6 @@ static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
 	mutex_lock(&input->mutex);
 
 	if (device_may_wakeup(&client->dev)) {
-		disable_irq_wake(client->irq);
-
 		if (!input->users) {
 			ret = pixcir_stop(ts);
 			if (ret) {
@@ -445,6 +443,13 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
 	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
 		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
 
+	pdata->wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
+	if (pdata->wakeirq < 0 && pdata->wakeirq != -ENODATA &&
+	    pdata->wakeirq != -EINVAL) {
+		dev_err(dev, "Failed to get wakeirq\n");
+		return ERR_PTR(pdata->wakeirq);
+	}
+
 	return pdata;
 }
 #else
@@ -564,11 +569,20 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, tsdata);
 	device_init_wakeup(&client->dev, 1);
 
+	/* Register wakeirq */
+	error = (pdata->wakeirq > 0) ?
+		dev_pm_set_dedicated_wake_irq(dev, pdata->wakeirq) :
+		dev_pm_set_wake_irq(dev, client->irq);
+	if (error)
+		dev_info(dev, "unable to setup wakeirq %d\n",
+			 error);
+
 	return 0;
 }
 
 static int pixcir_i2c_ts_remove(struct i2c_client *client)
 {
+	dev_pm_clear_wake_irq(&client->dev);
 	device_init_wakeup(&client->dev, 0);
 
 	return 0;
diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
index 7bae83b7c396..da573de5a5ee 100644
--- a/include/linux/input/pixcir_ts.h
+++ b/include/linux/input/pixcir_ts.h
@@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
 	int x_max;
 	int y_max;
 	int gpio_attb;		/* GPIO connected to ATTB line */
+	int wakeirq;
 	struct pixcir_i2c_chip_data chip;
 };
 
-- 
2.4.5

Re: [PATCH v3 1/2] input: touchscreen: pixcir_i2c_ts: Add support for optional wakeup interrupt

[Roger Quadros]

Hi,

On 23/07/15 17:54, Vignesh R wrote:
> On am437x-gp-evm, pixcir touchscreen can wake the system from low power
> state by generating wake-up interrupt via pinctrl and IO daisy chain.
> Add support for optional wakeup interrupt source by regsitering to
> automated wake IRQ framework introduced by commit 4990d4fe327b ("PM /
> Wakeirq: Add automated device wake IRQ handling").
> This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add
> support for optional wake-up")
> 
> Signed-off-by: Vignesh R <vigneshr@ti.com>
> ---
> 
> v3:
>  * handle error code returned by of_irq_get_byname()
> 
> v2:
>  * use of_irq_get_byname()
>  * remove enable/disable_wake_irq()
> 
>  drivers/input/touchscreen/pixcir_i2c_ts.c | 22 ++++++++++++++++++----
>  include/linux/input/pixcir_ts.h           |  1 +
>  2 files changed, 19 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 8f3e243a62bf..3a4ab358bf52 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -29,6 +29,8 @@
>  #include <linux/of.h>
>  #include <linux/of_gpio.h>
>  #include <linux/of_device.h>
> +#include <linux/of_irq.h>
> +#include <linux/pm_wakeirq.h>
>  
>  #define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
>  
> @@ -364,8 +366,6 @@ static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
>  				goto unlock;
>  			}
>  		}
> -
> -		enable_irq_wake(client->irq);
>  	} else if (input->users) {
>  		ret = pixcir_stop(ts);
>  	}
> @@ -386,8 +386,6 @@ static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
>  	mutex_lock(&input->mutex);
>  
>  	if (device_may_wakeup(&client->dev)) {
> -		disable_irq_wake(client->irq);
> -
>  		if (!input->users) {
>  			ret = pixcir_stop(ts);
>  			if (ret) {
> @@ -445,6 +443,13 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>  	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
>  		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
>  
> +	pdata->wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
> +	if (pdata->wakeirq < 0 && pdata->wakeirq != -ENODATA &&
> +	    pdata->wakeirq != -EINVAL) {
> +		dev_err(dev, "Failed to get wakeirq\n");
> +		return ERR_PTR(pdata->wakeirq);
> +	}
> +
>  	return pdata;
>  }
>  #else
> @@ -564,11 +569,20 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>  	i2c_set_clientdata(client, tsdata);
>  	device_init_wakeup(&client->dev, 1);
>  
> +	/* Register wakeirq */
> +	error = (pdata->wakeirq > 0) ?
> +		dev_pm_set_dedicated_wake_irq(dev, pdata->wakeirq) :
> +		dev_pm_set_wake_irq(dev, client->irq);

Can 0 be a valid wakeirq or client->irq?
If yes then this logic is broken.

I would set wakeirq to -EINVAL or something if it is not available
during probe and check for that condition.

> +	if (error)
> +		dev_info(dev, "unable to setup wakeirq %d\n",
> +			 error);
> +
>  	return 0;
>  }
>  
>  static int pixcir_i2c_ts_remove(struct i2c_client *client)
>  {
> +	dev_pm_clear_wake_irq(&client->dev);
>  	device_init_wakeup(&client->dev, 0);
>  
>  	return 0;
> diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
> index 7bae83b7c396..da573de5a5ee 100644
> --- a/include/linux/input/pixcir_ts.h
> +++ b/include/linux/input/pixcir_ts.h
> @@ -58,6 +58,7 @@ struct pixcir_ts_platform_data {
>  	int x_max;
>  	int y_max;
>  	int gpio_attb;		/* GPIO connected to ATTB line */
> +	int wakeirq;
>  	struct pixcir_i2c_chip_data chip;
>  };
>  
> 

cheers,
-roger

Re: [PATCH v3 1/2] input: touchscreen: pixcir_i2c_ts: Add support for optional wakeup interrupt

[Vignesh R]

On 07/27/2015 04:19 PM, Roger Quadros wrote:
> Hi,
> 
> On 23/07/15 17:54, Vignesh R wrote:
>> On am437x-gp-evm, pixcir touchscreen can wake the system from low power
>> state by generating wake-up interrupt via pinctrl and IO daisy chain.
>> Add support for optional wakeup interrupt source by regsitering to
>> automated wake IRQ framework introduced by commit 4990d4fe327b ("PM /
>> Wakeirq: Add automated device wake IRQ handling").
>> This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add
>> support for optional wake-up")
>>
>> Signed-off-by: Vignesh R <vigneshr@ti.com>
>> ---
>>
>> v3:
>>  * handle error code returned by of_irq_get_byname()
>>
>> v2:
>>  * use of_irq_get_byname()
>>  * remove enable/disable_wake_irq()
>>
>>  drivers/input/touchscreen/pixcir_i2c_ts.c | 22 ++++++++++++++++++----
>>  include/linux/input/pixcir_ts.h           |  1 +
>>  2 files changed, 19 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
>> index 8f3e243a62bf..3a4ab358bf52 100644
>> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
>> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
>> @@ -29,6 +29,8 @@
>>  #include <linux/of.h>
>>  #include <linux/of_gpio.h>
>>  #include <linux/of_device.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/pm_wakeirq.h>
>>  
>>  #define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
>>  
>> @@ -364,8 +366,6 @@ static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
>>  				goto unlock;
>>  			}
>>  		}
>> -
>> -		enable_irq_wake(client->irq);
>>  	} else if (input->users) {
>>  		ret = pixcir_stop(ts);
>>  	}
>> @@ -386,8 +386,6 @@ static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
>>  	mutex_lock(&input->mutex);
>>  
>>  	if (device_may_wakeup(&client->dev)) {
>> -		disable_irq_wake(client->irq);
>> -
>>  		if (!input->users) {
>>  			ret = pixcir_stop(ts);
>>  			if (ret) {
>> @@ -445,6 +443,13 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>>  	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
>>  		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
>>  
>> +	pdata->wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
>> +	if (pdata->wakeirq < 0 && pdata->wakeirq != -ENODATA &&
>> +	    pdata->wakeirq != -EINVAL) {
>> +		dev_err(dev, "Failed to get wakeirq\n");
>> +		return ERR_PTR(pdata->wakeirq);
>> +	}
>> +
>>  	return pdata;
>>  }
>>  #else
>> @@ -564,11 +569,20 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>>  	i2c_set_clientdata(client, tsdata);
>>  	device_init_wakeup(&client->dev, 1);
>>  
>> +	/* Register wakeirq */
>> +	error = (pdata->wakeirq > 0) ?
>> +		dev_pm_set_dedicated_wake_irq(dev, pdata->wakeirq) :
>> +		dev_pm_set_wake_irq(dev, client->irq);
> 
> Can 0 be a valid wakeirq or client->irq?
> If yes then this logic is broken.
> 

AFAIK, IRQ 0 is always assigned to system timer interrupt (cannot find
reliable source to quote).

> I would set wakeirq to -EINVAL or something if it is not available
> during probe and check for that condition.
> 

Not sure, if I understand you correctly
pdata->wakeirq will have -ENODATA or -EINVAL(as returned by
of_irq_get_byname()), if wakeirq is not available. Do you want me to
check for these two conditions specifically rather than
(pdata->wakeirq > 0) ?

-- 
Regards
Vignesh

Re: [PATCH v3 1/2] input: touchscreen: pixcir_i2c_ts: Add support for optional wakeup interrupt

[Dmitry Torokhov]

On Mon, Jul 27, 2015 at 04:49:22PM +0530, Vignesh R wrote:
> 
> 
> On 07/27/2015 04:19 PM, Roger Quadros wrote:
> > Hi,
> > 
> > On 23/07/15 17:54, Vignesh R wrote:
> >> On am437x-gp-evm, pixcir touchscreen can wake the system from low power
> >> state by generating wake-up interrupt via pinctrl and IO daisy chain.
> >> Add support for optional wakeup interrupt source by regsitering to
> >> automated wake IRQ framework introduced by commit 4990d4fe327b ("PM /
> >> Wakeirq: Add automated device wake IRQ handling").
> >> This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add
> >> support for optional wake-up")
> >>
> >> Signed-off-by: Vignesh R <vigneshr@ti.com>
> >> ---
> >>
> >> v3:
> >>  * handle error code returned by of_irq_get_byname()
> >>
> >> v2:
> >>  * use of_irq_get_byname()
> >>  * remove enable/disable_wake_irq()
> >>
> >>  drivers/input/touchscreen/pixcir_i2c_ts.c | 22 ++++++++++++++++++----
> >>  include/linux/input/pixcir_ts.h           |  1 +
> >>  2 files changed, 19 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> >> index 8f3e243a62bf..3a4ab358bf52 100644
> >> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> >> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> >> @@ -29,6 +29,8 @@
> >>  #include <linux/of.h>
> >>  #include <linux/of_gpio.h>
> >>  #include <linux/of_device.h>
> >> +#include <linux/of_irq.h>
> >> +#include <linux/pm_wakeirq.h>
> >>  
> >>  #define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
> >>  
> >> @@ -364,8 +366,6 @@ static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
> >>  				goto unlock;
> >>  			}
> >>  		}
> >> -
> >> -		enable_irq_wake(client->irq);
> >>  	} else if (input->users) {
> >>  		ret = pixcir_stop(ts);
> >>  	}
> >> @@ -386,8 +386,6 @@ static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
> >>  	mutex_lock(&input->mutex);
> >>  
> >>  	if (device_may_wakeup(&client->dev)) {
> >> -		disable_irq_wake(client->irq);
> >> -
> >>  		if (!input->users) {
> >>  			ret = pixcir_stop(ts);
> >>  			if (ret) {
> >> @@ -445,6 +443,13 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
> >>  	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
> >>  		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
> >>  
> >> +	pdata->wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
> >> +	if (pdata->wakeirq < 0 && pdata->wakeirq != -ENODATA &&
> >> +	    pdata->wakeirq != -EINVAL) {
> >> +		dev_err(dev, "Failed to get wakeirq\n");
> >> +		return ERR_PTR(pdata->wakeirq);
> >> +	}
> >> +
> >>  	return pdata;
> >>  }
> >>  #else
> >> @@ -564,11 +569,20 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
> >>  	i2c_set_clientdata(client, tsdata);
> >>  	device_init_wakeup(&client->dev, 1);
> >>  
> >> +	/* Register wakeirq */
> >> +	error = (pdata->wakeirq > 0) ?
> >> +		dev_pm_set_dedicated_wake_irq(dev, pdata->wakeirq) :
> >> +		dev_pm_set_wake_irq(dev, client->irq);
> > 
> > Can 0 be a valid wakeirq or client->irq?
> > If yes then this logic is broken.
> > 
> 
> AFAIK, IRQ 0 is always assigned to system timer interrupt (cannot find
> reliable source to quote).
> 
> > I would set wakeirq to -EINVAL or something if it is not available
> > during probe and check for that condition.
> > 
> 
> Not sure, if I understand you correctly
> pdata->wakeirq will have -ENODATA or -EINVAL(as returned by
> of_irq_get_byname()), if wakeirq is not available. Do you want me to
> check for these two conditions specifically rather than
> (pdata->wakeirq > 0) ?

0 is not really valid general IRQ number; I2C for example sets
client->irq to 0 when there is no IRQ.

BTW, what do you think about my patch pushing this into i2c core? Could
you try and see if it works for you?

Thanks.

-- 
Dmitry

Re: [PATCH v3 1/2] input: touchscreen: pixcir_i2c_ts: Add support for optional wakeup interrupt

[Roger Quadros]

On 28/07/15 00:20, Dmitry Torokhov wrote:
> On Mon, Jul 27, 2015 at 04:49:22PM +0530, Vignesh R wrote:
>>
>>
>> On 07/27/2015 04:19 PM, Roger Quadros wrote:
>>> Hi,
>>>
>>> On 23/07/15 17:54, Vignesh R wrote:
>>>> On am437x-gp-evm, pixcir touchscreen can wake the system from low power
>>>> state by generating wake-up interrupt via pinctrl and IO daisy chain.
>>>> Add support for optional wakeup interrupt source by regsitering to
>>>> automated wake IRQ framework introduced by commit 4990d4fe327b ("PM /
>>>> Wakeirq: Add automated device wake IRQ handling").
>>>> This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add
>>>> support for optional wake-up")
>>>>
>>>> Signed-off-by: Vignesh R <vigneshr@ti.com>
>>>> ---
>>>>
>>>> v3:
>>>>  * handle error code returned by of_irq_get_byname()
>>>>
>>>> v2:
>>>>  * use of_irq_get_byname()
>>>>  * remove enable/disable_wake_irq()
>>>>
>>>>  drivers/input/touchscreen/pixcir_i2c_ts.c | 22 ++++++++++++++++++----
>>>>  include/linux/input/pixcir_ts.h           |  1 +
>>>>  2 files changed, 19 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
>>>> index 8f3e243a62bf..3a4ab358bf52 100644
>>>> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
>>>> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
>>>> @@ -29,6 +29,8 @@
>>>>  #include <linux/of.h>
>>>>  #include <linux/of_gpio.h>
>>>>  #include <linux/of_device.h>
>>>> +#include <linux/of_irq.h>
>>>> +#include <linux/pm_wakeirq.h>
>>>>  
>>>>  #define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
>>>>  
>>>> @@ -364,8 +366,6 @@ static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
>>>>  				goto unlock;
>>>>  			}
>>>>  		}
>>>> -
>>>> -		enable_irq_wake(client->irq);
>>>>  	} else if (input->users) {
>>>>  		ret = pixcir_stop(ts);
>>>>  	}
>>>> @@ -386,8 +386,6 @@ static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
>>>>  	mutex_lock(&input->mutex);
>>>>  
>>>>  	if (device_may_wakeup(&client->dev)) {
>>>> -		disable_irq_wake(client->irq);
>>>> -
>>>>  		if (!input->users) {
>>>>  			ret = pixcir_stop(ts);
>>>>  			if (ret) {
>>>> @@ -445,6 +443,13 @@ static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
>>>>  	dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
>>>>  		pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
>>>>  
>>>> +	pdata->wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
>>>> +	if (pdata->wakeirq < 0 && pdata->wakeirq != -ENODATA &&
>>>> +	    pdata->wakeirq != -EINVAL) {
>>>> +		dev_err(dev, "Failed to get wakeirq\n");
>>>> +		return ERR_PTR(pdata->wakeirq);
>>>> +	}
>>>> +
>>>>  	return pdata;
>>>>  }
>>>>  #else
>>>> @@ -564,11 +569,20 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
>>>>  	i2c_set_clientdata(client, tsdata);
>>>>  	device_init_wakeup(&client->dev, 1);
>>>>  
>>>> +	/* Register wakeirq */
>>>> +	error = (pdata->wakeirq > 0) ?
>>>> +		dev_pm_set_dedicated_wake_irq(dev, pdata->wakeirq) :
>>>> +		dev_pm_set_wake_irq(dev, client->irq);
>>>
>>> Can 0 be a valid wakeirq or client->irq?
>>> If yes then this logic is broken.
>>>
>>
>> AFAIK, IRQ 0 is always assigned to system timer interrupt (cannot find
>> reliable source to quote).
>>
>>> I would set wakeirq to -EINVAL or something if it is not available
>>> during probe and check for that condition.
>>>
>>
>> Not sure, if I understand you correctly
>> pdata->wakeirq will have -ENODATA or -EINVAL(as returned by
>> of_irq_get_byname()), if wakeirq is not available. Do you want me to
>> check for these two conditions specifically rather than
>> (pdata->wakeirq > 0) ?
> 
> 0 is not really valid general IRQ number; I2C for example sets
> client->irq to 0 when there is no IRQ.

OK. If we assume 0 is invalid IRQ, then the patch is fine.

cheers,
-roger

[PATCH v3 2/2] ARM: dts: am437x-gp-evm: Add wakeup interrupt source for pixcir_i2c_tsc

[Vignesh R]

Pixcir_i2c_tsc driver can now wakeup the system from lower power state
via pinctrl and IO daisy chain using generic wakeirq framwework. Add
optional wakeup irq entry to allow pixcir_i2c_tsc to wake system from
low power state.

Signed-off-by: Vignesh R <vigneshr@ti.com>
---

v3:
 * Drop "irq" suffix from interrupt-names.

v2:
 * Add interrupt-names property.

 arch/arm/boot/dts/am437x-gp-evm.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/am437x-gp-evm.dts b/arch/arm/boot/dts/am437x-gp-evm.dts
index 84aa30c3235a..99209a137c63 100644
--- a/arch/arm/boot/dts/am437x-gp-evm.dts
+++ b/arch/arm/boot/dts/am437x-gp-evm.dts
@@ -503,6 +503,10 @@
 
 		attb-gpio = <&gpio3 22 GPIO_ACTIVE_HIGH>;
 
+		interrupts-extended = <&gpio3 22 GPIO_ACTIVE_HIGH>,
+				      <&am43xx_pinmux 0x264>;
+		interrupt-names = "tsc", "wakeup";
+
 		touchscreen-size-x = <1024>;
 		touchscreen-size-y = <600>;
 	};
-- 
2.4.5