[PATCH] of/irq: introduce of_has_named_irqs helper

[PATCH] of/irq: introduce of_has_named_irqs helper

[Dmitry Torokhov]

Sometimes drivers might wish to transition from index-based to named
interrupt descriptions. To aid in decision-making when parsing device
tree data let's provide a helper that will indicate the scheme that is
being used.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

The intent is to it like this:

	if (of_has_named_irqs(np) {
		/* Wake IRQ is optional */
		dev->wakeirq = of_irq_get_byname(np, "wakeup");
		if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
			return dev->wakeirq;
	}

 drivers/of/irq.c       | 14 ++++++++++++++
 include/linux/of_irq.h |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 3cf7a01..e02c43e 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -384,6 +384,19 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
 EXPORT_SYMBOL_GPL(of_irq_to_resource);
 
 /**
+ * of_has_named_irq - Check if given node contains named interrupts
+ * @dev: pointer to device tree node
+ *
+ * Returns %true if node contains non-empty "interrupt-names" property.
+ */
+bool of_has_named_irqs(struct device_node *dev)
+{
+	struct property *prop = of_find_property(dev, "interrupt-names", NULL);
+
+	return prop && prop->value;
+}
+
+/**
  * of_irq_get - Decode a node's IRQ and return it as a Linux irq number
  * @dev: pointer to device tree node
  * @index: zero-based index of the irq
@@ -410,6 +423,7 @@ int of_irq_get(struct device_node *dev, int index)
 }
 EXPORT_SYMBOL_GPL(of_irq_get);
 
+
 /**
  * of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number
  * @dev: pointer to device tree node
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index d884929..fed6ccc 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -46,6 +46,7 @@ extern int of_irq_get(struct device_node *dev, int index);
 extern int of_irq_get_byname(struct device_node *dev, const char *name);
 extern int of_irq_to_resource_table(struct device_node *dev,
 		struct resource *res, int nr_irqs);
+extern bool of_has_named_irqs(struct device_node *dev);
 #else
 static inline int of_irq_count(struct device_node *dev)
 {
@@ -64,6 +65,10 @@ static inline int of_irq_to_resource_table(struct device_node *dev,
 {
 	return 0;
 }
+static inline bool of_has_named_irqs(struct device_node *dev)
+{
+	return false;
+}
 #endif
 
 #if defined(CONFIG_OF)
-- 
2.5.0.rc2.392.g76e840b


-- 
Dmitry

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Rob Herring]

On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:
> Sometimes drivers might wish to transition from index-based to named
> interrupt descriptions. To aid in decision-making when parsing device
> tree data let's provide a helper that will indicate the scheme that is
> being used.

Generally, IRQs are retrieved by platform_get_irq or
platform_get_irq_byname. Drivers should not call the of_irq_*
functions directly in most cases.

>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> ---
>
> The intent is to it like this:
>
>         if (of_has_named_irqs(np) {
>                 /* Wake IRQ is optional */
>                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
>                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
>                         return dev->wakeirq;
>         }

of_irq_get_byname will already return an error if the property is not
present. Use that.

Rob

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Dmitry Torokhov]

On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
> <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Sometimes drivers might wish to transition from index-based to named
> > interrupt descriptions. To aid in decision-making when parsing device
> > tree data let's provide a helper that will indicate the scheme that is
> > being used.
> 
> Generally, IRQs are retrieved by platform_get_irq or
> platform_get_irq_byname. Drivers should not call the of_irq_*
> functions directly in most cases.

That would be true for platform drivers, but not all devices are
platform devices.

> 
> >
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > ---
> >
> > The intent is to it like this:
> >
> >         if (of_has_named_irqs(np) {
> >                 /* Wake IRQ is optional */
> >                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
> >                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
> >                         return dev->wakeirq;
> >         }
> 
> of_irq_get_byname will already return an error if the property is not
> present. Use that.

I do not like that it returns -EINVAL when property is missing, can we
change it to return -ENODATA (so it is the same as when the property is
defined but such name is missing)?

Thanks.

-- 
Dmitry
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Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Dmitry Torokhov]

On Fri, Jul 24, 2015 at 12:26:19PM -0700, Dmitry Torokhov wrote:
> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
> > On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
> > <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > Sometimes drivers might wish to transition from index-based to named
> > > interrupt descriptions. To aid in decision-making when parsing device
> > > tree data let's provide a helper that will indicate the scheme that is
> > > being used.
> > 
> > Generally, IRQs are retrieved by platform_get_irq or
> > platform_get_irq_byname. Drivers should not call the of_irq_*
> > functions directly in most cases.
> 
> That would be true for platform drivers, but not all devices are
> platform devices.
> 
> > 
> > >
> > > Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > > ---
> > >
> > > The intent is to it like this:
> > >
> > >         if (of_has_named_irqs(np) {
> > >                 /* Wake IRQ is optional */
> > >                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
> > >                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
> > >                         return dev->wakeirq;
> > >         }
> > 
> > of_irq_get_byname will already return an error if the property is not
> > present. Use that.
> 
> I do not like that it returns -EINVAL when property is missing, can we
> change it to return -ENODATA (so it is the same as when the property is
> defined but such name is missing)?

So here is what I had in mind.. It is based on recent patch by Vignesh
for pixcir touchscreen, but I think it should be made available to all
I2C devices. Completely untested at the moment.

---
 drivers/i2c/i2c-core.c |   43 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 37 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e6d4935..3971461 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -47,6 +47,7 @@
 #include <linux/rwsem.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_domain.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/acpi.h>
 #include <linux/jump_label.h>
 #include <asm/uaccess.h>
@@ -631,6 +632,7 @@ static int i2c_device_probe(struct device *dev)
 {
 	struct i2c_client	*client = i2c_verify_client(dev);
 	struct i2c_driver	*driver;
+	int wakeirq = 0;
 	int status;
 
 	if (!client)
@@ -639,11 +641,13 @@ static int i2c_device_probe(struct device *dev)
 	if (!client->irq) {
 		int irq = -ENOENT;
 
-		if (dev->of_node)
-			irq = of_irq_get(dev->of_node, 0);
-		else if (ACPI_COMPANION(dev))
+		if (dev->of_node) {
+			irq = of_has_named_irqs(dev->of_node) ?
+				of_irq_get_byname(dev->of_node, "irq") :
+				of_irq_get(dev->of_node, 0);
+		} else if (ACPI_COMPANION(dev)) {
 			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
-
+		}
 		if (irq == -EPROBE_DEFER)
 			return irq;
 		if (irq < 0)
@@ -652,6 +656,15 @@ static int i2c_device_probe(struct device *dev)
 		client->irq = irq;
 	}
 
+	if (dev->of_node && of_has_named_irqs(dev->of_node)) {
+		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
+		if (wakeirq < 0) {
+			if (wakeirq != -ENODATA)
+				return wakeirq;
+			wakeirq = 0;
+		}
+	}
+
 	driver = to_i2c_driver(dev->driver);
 	if (!driver->probe || !driver->id_table)
 		return -ENODEV;
@@ -659,20 +672,34 @@ static int i2c_device_probe(struct device *dev)
 	if (!device_can_wakeup(&client->dev))
 		device_init_wakeup(&client->dev,
 					client->flags & I2C_CLIENT_WAKE);
+
+	status = wakeirq > 0 ?
+			dev_pm_set_dedicated_wake_irq(dev, wakeirq) :
+			(client->irq > 0 ?
+				dev_pm_set_wake_irq(dev, client->irq) : 0);
+	if (status)
+		dev_warn(&client->dev, "failed to set up wakeup irq");
+
 	dev_dbg(dev, "probe\n");
 
 	status = of_clk_set_defaults(dev->of_node, false);
 	if (status < 0)
-		return status;
+		goto err_clear_wakeup_irq;
 
 	status = dev_pm_domain_attach(&client->dev, true);
 	if (status != -EPROBE_DEFER) {
 		status = driver->probe(client, i2c_match_id(driver->id_table,
 					client));
 		if (status)
-			dev_pm_domain_detach(&client->dev, true);
+			goto err_detach_pm_domain;
 	}
 
+	return 0;
+
+err_detach_pm_domain:
+	dev_pm_domain_detach(&client->dev, true);
+err_clear_wakeup_irq:
+	dev_pm_clear_wake_irq(&client->dev);
 	return status;
 }
 
@@ -692,6 +719,10 @@ static int i2c_device_remove(struct device *dev)
 	}
 
 	dev_pm_domain_detach(&client->dev, true);
+
+	dev_pm_clear_wake_irq(&client->dev);
+	device_init_wakeup(&client->dev, 0);
+
 	return status;
 }
 

Thanks.

-- 
Dmitry

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Vignesh R]

Hi Dmitry,

On 07/25/2015 01:46 AM, Dmitry Torokhov wrote:
> On Fri, Jul 24, 2015 at 12:26:19PM -0700, Dmitry Torokhov wrote:
>> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
>>> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
>>> <dmitry.torokhov@gmail.com> wrote:
>>>> Sometimes drivers might wish to transition from index-based to named
>>>> interrupt descriptions. To aid in decision-making when parsing device
>>>> tree data let's provide a helper that will indicate the scheme that is
>>>> being used.
>>>
>>> Generally, IRQs are retrieved by platform_get_irq or
>>> platform_get_irq_byname. Drivers should not call the of_irq_*
>>> functions directly in most cases.
>>
>> That would be true for platform drivers, but not all devices are
>> platform devices.
>>
>>>
>>>>
>>>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
>>>> ---
>>>>
>>>> The intent is to it like this:
>>>>
>>>>         if (of_has_named_irqs(np) {
>>>>                 /* Wake IRQ is optional */
>>>>                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
>>>>                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
>>>>                         return dev->wakeirq;
>>>>         }
>>>
>>> of_irq_get_byname will already return an error if the property is not
>>> present. Use that.
>>
>> I do not like that it returns -EINVAL when property is missing, can we
>> change it to return -ENODATA (so it is the same as when the property is
>> defined but such name is missing)?
> 
> So here is what I had in mind.. It is based on recent patch by Vignesh
> for pixcir touchscreen, but I think it should be made available to all
> I2C devices. Completely untested at the moment.
> 

Thanks for the patch! I tested this on am437x-gp-evm and the
suspend/resume worked fine (below patch + $subject patch). I was able to
wake the system from low power state using touchscreen. Also verified
module insertion and removal. One comment though, please see below.

> ---
>  drivers/i2c/i2c-core.c |   43 +++++++++++++++++++++++++++++++++++++------
>  1 file changed, 37 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> index e6d4935..3971461 100644
> --- a/drivers/i2c/i2c-core.c
> +++ b/drivers/i2c/i2c-core.c
> @@ -47,6 +47,7 @@
>  #include <linux/rwsem.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/pm_domain.h>
> +#include <linux/pm_wakeirq.h>
>  #include <linux/acpi.h>
>  #include <linux/jump_label.h>
>  #include <asm/uaccess.h>
> @@ -631,6 +632,7 @@ static int i2c_device_probe(struct device *dev)
>  {
>  	struct i2c_client	*client = i2c_verify_client(dev);
>  	struct i2c_driver	*driver;
> +	int wakeirq = 0;
>  	int status;
>  
>  	if (!client)
> @@ -639,11 +641,13 @@ static int i2c_device_probe(struct device *dev)
>  	if (!client->irq) {
>  		int irq = -ENOENT;
>  
> -		if (dev->of_node)
> -			irq = of_irq_get(dev->of_node, 0);
> -		else if (ACPI_COMPANION(dev))
> +		if (dev->of_node) {
> +			irq = of_has_named_irqs(dev->of_node) ?
> +				of_irq_get_byname(dev->of_node, "irq") :
> +				of_irq_get(dev->of_node, 0);
> +		} else if (ACPI_COMPANION(dev)) {
>  			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
> -
> +		}
>  		if (irq == -EPROBE_DEFER)
>  			return irq;
>  		if (irq < 0)
> @@ -652,6 +656,15 @@ static int i2c_device_probe(struct device *dev)
>  		client->irq = irq;
>  	}
>  
> +	if (dev->of_node && of_has_named_irqs(dev->of_node)) {
> +		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
> +		if (wakeirq < 0) {
> +			if (wakeirq != -ENODATA)
> +				return wakeirq;
> +			wakeirq = 0;
> +		}
> +	}
> +
>  	driver = to_i2c_driver(dev->driver);
>  	if (!driver->probe || !driver->id_table)
>  		return -ENODEV;
> @@ -659,20 +672,34 @@ static int i2c_device_probe(struct device *dev)
>  	if (!device_can_wakeup(&client->dev))
>  		device_init_wakeup(&client->dev,
>  					client->flags & I2C_CLIENT_WAKE);
> +
> +	status = wakeirq > 0 ?
> +			dev_pm_set_dedicated_wake_irq(dev, wakeirq) :
> +			(client->irq > 0 ?
> +				dev_pm_set_wake_irq(dev, client->irq) : 0);

Above code tries to register wakeirq irrespective of whether the device
is specified as wakeup-source in the dt or not. Hence, I see warn
messages from every i2c device that has irq line but hasn't declared
itself as wakeup-source:
For example tps is on i2c:
[    1.961613] tps65218 0-0024: forgot to call call device_init_wakeup?
[    1.968340] tps65218 0-0024: failed to set up wakeup irq

May be you can register wakeup-source only if I2C_CLIENT_WAKE flag is
set in client->flags?

-- 
Regards
Vignesh

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Dmitry Torokhov]

On Tue, Jul 28, 2015 at 06:53:52PM +0530, Vignesh R wrote:
> Hi Dmitry,
> 
> On 07/25/2015 01:46 AM, Dmitry Torokhov wrote:
> > On Fri, Jul 24, 2015 at 12:26:19PM -0700, Dmitry Torokhov wrote:
> >> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
> >>> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
> >>> <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >>>> Sometimes drivers might wish to transition from index-based to named
> >>>> interrupt descriptions. To aid in decision-making when parsing device
> >>>> tree data let's provide a helper that will indicate the scheme that is
> >>>> being used.
> >>>
> >>> Generally, IRQs are retrieved by platform_get_irq or
> >>> platform_get_irq_byname. Drivers should not call the of_irq_*
> >>> functions directly in most cases.
> >>
> >> That would be true for platform drivers, but not all devices are
> >> platform devices.
> >>
> >>>
> >>>>
> >>>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> >>>> ---
> >>>>
> >>>> The intent is to it like this:
> >>>>
> >>>>         if (of_has_named_irqs(np) {
> >>>>                 /* Wake IRQ is optional */
> >>>>                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
> >>>>                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
> >>>>                         return dev->wakeirq;
> >>>>         }
> >>>
> >>> of_irq_get_byname will already return an error if the property is not
> >>> present. Use that.
> >>
> >> I do not like that it returns -EINVAL when property is missing, can we
> >> change it to return -ENODATA (so it is the same as when the property is
> >> defined but such name is missing)?
> > 
> > So here is what I had in mind.. It is based on recent patch by Vignesh
> > for pixcir touchscreen, but I think it should be made available to all
> > I2C devices. Completely untested at the moment.
> > 
> 
> Thanks for the patch! I tested this on am437x-gp-evm and the
> suspend/resume worked fine (below patch + $subject patch). I was able to
> wake the system from low power state using touchscreen. Also verified
> module insertion and removal. One comment though, please see below.
> 
> > ---
> >  drivers/i2c/i2c-core.c |   43 +++++++++++++++++++++++++++++++++++++------
> >  1 file changed, 37 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> > index e6d4935..3971461 100644
> > --- a/drivers/i2c/i2c-core.c
> > +++ b/drivers/i2c/i2c-core.c
> > @@ -47,6 +47,7 @@
> >  #include <linux/rwsem.h>
> >  #include <linux/pm_runtime.h>
> >  #include <linux/pm_domain.h>
> > +#include <linux/pm_wakeirq.h>
> >  #include <linux/acpi.h>
> >  #include <linux/jump_label.h>
> >  #include <asm/uaccess.h>
> > @@ -631,6 +632,7 @@ static int i2c_device_probe(struct device *dev)
> >  {
> >  	struct i2c_client	*client = i2c_verify_client(dev);
> >  	struct i2c_driver	*driver;
> > +	int wakeirq = 0;
> >  	int status;
> >  
> >  	if (!client)
> > @@ -639,11 +641,13 @@ static int i2c_device_probe(struct device *dev)
> >  	if (!client->irq) {
> >  		int irq = -ENOENT;
> >  
> > -		if (dev->of_node)
> > -			irq = of_irq_get(dev->of_node, 0);
> > -		else if (ACPI_COMPANION(dev))
> > +		if (dev->of_node) {
> > +			irq = of_has_named_irqs(dev->of_node) ?
> > +				of_irq_get_byname(dev->of_node, "irq") :
> > +				of_irq_get(dev->of_node, 0);
> > +		} else if (ACPI_COMPANION(dev)) {
> >  			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
> > -
> > +		}
> >  		if (irq == -EPROBE_DEFER)
> >  			return irq;
> >  		if (irq < 0)
> > @@ -652,6 +656,15 @@ static int i2c_device_probe(struct device *dev)
> >  		client->irq = irq;
> >  	}
> >  
> > +	if (dev->of_node && of_has_named_irqs(dev->of_node)) {
> > +		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
> > +		if (wakeirq < 0) {
> > +			if (wakeirq != -ENODATA)
> > +				return wakeirq;
> > +			wakeirq = 0;
> > +		}
> > +	}
> > +
> >  	driver = to_i2c_driver(dev->driver);
> >  	if (!driver->probe || !driver->id_table)
> >  		return -ENODEV;
> > @@ -659,20 +672,34 @@ static int i2c_device_probe(struct device *dev)
> >  	if (!device_can_wakeup(&client->dev))
> >  		device_init_wakeup(&client->dev,
> >  					client->flags & I2C_CLIENT_WAKE);
> > +
> > +	status = wakeirq > 0 ?
> > +			dev_pm_set_dedicated_wake_irq(dev, wakeirq) :
> > +			(client->irq > 0 ?
> > +				dev_pm_set_wake_irq(dev, client->irq) : 0);
> 
> Above code tries to register wakeirq irrespective of whether the device
> is specified as wakeup-source in the dt or not. Hence, I see warn
> messages from every i2c device that has irq line but hasn't declared
> itself as wakeup-source:
> For example tps is on i2c:
> [    1.961613] tps65218 0-0024: forgot to call call device_init_wakeup?
> [    1.968340] tps65218 0-0024: failed to set up wakeup irq
> 
> May be you can register wakeup-source only if I2C_CLIENT_WAKE flag is
> set in client->flags?

Makes sense, I'll prepare a new version.

Just to confirm: do you see any issues with these 2 patches if you do
not modify the drivers to drop calls enable_irq_wake() from them?

Thanks.

-- 
Dmitry
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Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[R, Vignesh]

Hi,

On 7/28/2015 10:53 PM, Dmitry Torokhov wrote:
> On Tue, Jul 28, 2015 at 06:53:52PM +0530, Vignesh R wrote:
>> Hi Dmitry,
>>
>> On 07/25/2015 01:46 AM, Dmitry Torokhov wrote:
>>> On Fri, Jul 24, 2015 at 12:26:19PM -0700, Dmitry Torokhov wrote:
>>>> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
>>>>> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
>>>>> <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>>>>> Sometimes drivers might wish to transition from index-based to named
>>>>>> interrupt descriptions. To aid in decision-making when parsing device
>>>>>> tree data let's provide a helper that will indicate the scheme that is
>>>>>> being used.
>>>>>
>>>>> Generally, IRQs are retrieved by platform_get_irq or
>>>>> platform_get_irq_byname. Drivers should not call the of_irq_*
>>>>> functions directly in most cases.
>>>>
>>>> That would be true for platform drivers, but not all devices are
>>>> platform devices.
>>>>
>>>>>
>>>>>>
>>>>>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>>>>>> ---
>>>>>>
>>>>>> The intent is to it like this:
>>>>>>
>>>>>>         if (of_has_named_irqs(np) {
>>>>>>                 /* Wake IRQ is optional */
>>>>>>                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
>>>>>>                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
>>>>>>                         return dev->wakeirq;
>>>>>>         }
>>>>>
>>>>> of_irq_get_byname will already return an error if the property is not
>>>>> present. Use that.
>>>>
>>>> I do not like that it returns -EINVAL when property is missing, can we
>>>> change it to return -ENODATA (so it is the same as when the property is
>>>> defined but such name is missing)?
>>>
>>> So here is what I had in mind.. It is based on recent patch by Vignesh
>>> for pixcir touchscreen, but I think it should be made available to all
>>> I2C devices. Completely untested at the moment.
>>>
>>
>> Thanks for the patch! I tested this on am437x-gp-evm and the
>> suspend/resume worked fine (below patch + $subject patch). I was able to
>> wake the system from low power state using touchscreen. Also verified
>> module insertion and removal. One comment though, please see below.
>>
>>> ---
>>>  drivers/i2c/i2c-core.c |   43 +++++++++++++++++++++++++++++++++++++------
>>>  1 file changed, 37 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
>>> index e6d4935..3971461 100644
>>> --- a/drivers/i2c/i2c-core.c
>>> +++ b/drivers/i2c/i2c-core.c
>>> @@ -47,6 +47,7 @@
>>>  #include <linux/rwsem.h>
>>>  #include <linux/pm_runtime.h>
>>>  #include <linux/pm_domain.h>
>>> +#include <linux/pm_wakeirq.h>
>>>  #include <linux/acpi.h>
>>>  #include <linux/jump_label.h>
>>>  #include <asm/uaccess.h>
>>> @@ -631,6 +632,7 @@ static int i2c_device_probe(struct device *dev)
>>>  {
>>>  	struct i2c_client	*client = i2c_verify_client(dev);
>>>  	struct i2c_driver	*driver;
>>> +	int wakeirq = 0;
>>>  	int status;
>>>  
>>>  	if (!client)
>>> @@ -639,11 +641,13 @@ static int i2c_device_probe(struct device *dev)
>>>  	if (!client->irq) {
>>>  		int irq = -ENOENT;
>>>  
>>> -		if (dev->of_node)
>>> -			irq = of_irq_get(dev->of_node, 0);
>>> -		else if (ACPI_COMPANION(dev))
>>> +		if (dev->of_node) {
>>> +			irq = of_has_named_irqs(dev->of_node) ?
>>> +				of_irq_get_byname(dev->of_node, "irq") :
>>> +				of_irq_get(dev->of_node, 0);
>>> +		} else if (ACPI_COMPANION(dev)) {
>>>  			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
>>> -
>>> +		}
>>>  		if (irq == -EPROBE_DEFER)
>>>  			return irq;
>>>  		if (irq < 0)
>>> @@ -652,6 +656,15 @@ static int i2c_device_probe(struct device *dev)
>>>  		client->irq = irq;
>>>  	}
>>>  
>>> +	if (dev->of_node && of_has_named_irqs(dev->of_node)) {
>>> +		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
>>> +		if (wakeirq < 0) {
>>> +			if (wakeirq != -ENODATA)
>>> +				return wakeirq;
>>> +			wakeirq = 0;
>>> +		}
>>> +	}
>>> +
>>>  	driver = to_i2c_driver(dev->driver);
>>>  	if (!driver->probe || !driver->id_table)
>>>  		return -ENODEV;diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 8f3e243a62bf..6bd1d1ca9883 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -365,7 +365,6 @@ static int __maybe_unused
pixcir_i2c_ts_suspend(struct device *dev)
                        }
                }

-               enable_irq_wake(client->irq);
        } else if (input->users) {
                ret = pixcir_stop(ts);
        }
@@ -386,7 +385,6 @@ 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);
@@ -464,7 +462,7 @@ static int pixcir_i2c_ts_probe(struct i2c_client
*client,
        struct pixcir_i2c_ts_data *tsdata;
        struct input_dev *input;
        int error;
-
+printk("PROBING PIXCIR\n");
        if (np && !pdata) {
                pdata = pixcir_parse_dt(dev);
                if (IS_ERR(pdata))
@@ -562,14 +560,6 @@ static int pixcir_i2c_ts_probe(struct i2c_client
*client,
                return error;

        i2c_set_clientdata(client, tsdata);
-       device_init_wakeup(&client->dev, 1);
-
-       return 0;
-}
-
-static int pixcir_i2c_ts_remove(struct i2c_client *client)
-{
-       device_init_wakeup(&client->dev, 0);

        return 0;
 }
@@ -608,7 +598,6 @@ static struct i2c_driver pixcir_i2c_ts_driver = {
                .of_match_table = of_match_ptr(pixcir_of_match),
        },
        .probe          = pixcir_i2c_ts_probe,
-       .remove         = pixcir_i2c_ts_remove,
        .id_table       = pixcir_i2c_ts_id,
 };
>>> @@ -659,20 +672,34 @@ static int i2c_device_probe(struct device *dev)
>>>  	if y i2c(!device_can_wakeup(&client->dev))
>>>  		device_init_wakeup(&client->dev,
>>>  					client->flags & I2C_CLIENT_WAKE);
>>> +
>>> +	status = wakeirq > 0 ?
>>> +			dev_pm_set_dedicated_wake_irq(dev, wakeirq) :
>>> +			(client->irq > 0 ?
>>> +				dev_pm_set_wake_irq(dev, client->irq) : 0);
>>
>> Above code tries to register wakeirq irrespective of whether the device
>> is specified as wakeup-source in the dt or not. Hence, I see warn
>> messages from every i2c device that has irq line but hasn't declared
>> itself as wakeup-source:
>> For example tps is on i2c:
>> [    1.961613] tps65218 0-0024: forgot to call call device_init_wakeup?
>> [    1.968340] tps65218 0-0024: failed to set up wakeup irq
>>
>> May be you can register wakeup-source only if I2C_CLIENT_WAKE flag is
>> set in client->flags?
> 
> Makes sense, I'll prepare a new version.
> 
> Just to confirm: do you see any issues with these 2 patches if you do
> not modify the drivers to drop calls enable_irq_wake() from them?

No, I didn't test w/o dropping enable_irq_wake() calls. I will do that
tomo. Is this to verify that these 2 patches can be added w/o dropping
enable_irq_wake() from other i2c drivers currently using them?

Regards
Vignesh

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Dmitry Torokhov]

On Tue, Jul 28, 2015 at 11:16:44PM +0530, R, Vignesh wrote:
> Hi,
> 
> On 7/28/2015 10:53 PM, Dmitry Torokhov wrote:
> > On Tue, Jul 28, 2015 at 06:53:52PM +0530, Vignesh R wrote:
> >> Hi Dmitry,
> >>
> >> On 07/25/2015 01:46 AM, Dmitry Torokhov wrote:
> >>> On Fri, Jul 24, 2015 at 12:26:19PM -0700, Dmitry Torokhov wrote:
> >>>> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
> >>>>> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
> >>>>> <dmitry.torokhov@gmail.com> wrote:
> >>>>>> Sometimes drivers might wish to transition from index-based to named
> >>>>>> interrupt descriptions. To aid in decision-making when parsing device
> >>>>>> tree data let's provide a helper that will indicate the scheme that is
> >>>>>> being used.
> >>>>>
> >>>>> Generally, IRQs are retrieved by platform_get_irq or
> >>>>> platform_get_irq_byname. Drivers should not call the of_irq_*
> >>>>> functions directly in most cases.
> >>>>
> >>>> That would be true for platform drivers, but not all devices are
> >>>> platform devices.
> >>>>
> >>>>>
> >>>>>>
> >>>>>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> >>>>>> ---
> >>>>>>
> >>>>>> The intent is to it like this:
> >>>>>>
> >>>>>>         if (of_has_named_irqs(np) {
> >>>>>>                 /* Wake IRQ is optional */
> >>>>>>                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
> >>>>>>                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
> >>>>>>                         return dev->wakeirq;
> >>>>>>         }
> >>>>>
> >>>>> of_irq_get_byname will already return an error if the property is not
> >>>>> present. Use that.
> >>>>
> >>>> I do not like that it returns -EINVAL when property is missing, can we
> >>>> change it to return -ENODATA (so it is the same as when the property is
> >>>> defined but such name is missing)?
> >>>
> >>> So here is what I had in mind.. It is based on recent patch by Vignesh
> >>> for pixcir touchscreen, but I think it should be made available to all
> >>> I2C devices. Completely untested at the moment.
> >>>
> >>
> >> Thanks for the patch! I tested this on am437x-gp-evm and the
> >> suspend/resume worked fine (below patch + $subject patch). I was able to
> >> wake the system from low power state using touchscreen. Also verified
> >> module insertion and removal. One comment though, please see below.
> >>
> >>> ---
> >>>  drivers/i2c/i2c-core.c |   43 +++++++++++++++++++++++++++++++++++++------
> >>>  1 file changed, 37 insertions(+), 6 deletions(-)
> >>>
> >>> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> >>> index e6d4935..3971461 100644
> >>> --- a/drivers/i2c/i2c-core.c
> >>> +++ b/drivers/i2c/i2c-core.c
> >>> @@ -47,6 +47,7 @@
> >>>  #include <linux/rwsem.h>
> >>>  #include <linux/pm_runtime.h>
> >>>  #include <linux/pm_domain.h>
> >>> +#include <linux/pm_wakeirq.h>
> >>>  #include <linux/acpi.h>
> >>>  #include <linux/jump_label.h>
> >>>  #include <asm/uaccess.h>
> >>> @@ -631,6 +632,7 @@ static int i2c_device_probe(struct device *dev)
> >>>  {
> >>>  	struct i2c_client	*client = i2c_verify_client(dev);
> >>>  	struct i2c_driver	*driver;
> >>> +	int wakeirq = 0;
> >>>  	int status;
> >>>  
> >>>  	if (!client)
> >>> @@ -639,11 +641,13 @@ static int i2c_device_probe(struct device *dev)
> >>>  	if (!client->irq) {
> >>>  		int irq = -ENOENT;
> >>>  
> >>> -		if (dev->of_node)
> >>> -			irq = of_irq_get(dev->of_node, 0);
> >>> -		else if (ACPI_COMPANION(dev))
> >>> +		if (dev->of_node) {
> >>> +			irq = of_has_named_irqs(dev->of_node) ?
> >>> +				of_irq_get_byname(dev->of_node, "irq") :
> >>> +				of_irq_get(dev->of_node, 0);
> >>> +		} else if (ACPI_COMPANION(dev)) {
> >>>  			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
> >>> -
> >>> +		}
> >>>  		if (irq == -EPROBE_DEFER)
> >>>  			return irq;
> >>>  		if (irq < 0)
> >>> @@ -652,6 +656,15 @@ static int i2c_device_probe(struct device *dev)
> >>>  		client->irq = irq;
> >>>  	}
> >>>  
> >>> +	if (dev->of_node && of_has_named_irqs(dev->of_node)) {
> >>> +		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
> >>> +		if (wakeirq < 0) {
> >>> +			if (wakeirq != -ENODATA)
> >>> +				return wakeirq;
> >>> +			wakeirq = 0;
> >>> +		}
> >>> +	}
> >>> +
> >>>  	driver = to_i2c_driver(dev->driver);
> >>>  	if (!driver->probe || !driver->id_table)
> >>>  		return -ENODEV;diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 8f3e243a62bf..6bd1d1ca9883 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -365,7 +365,6 @@ static int __maybe_unused
> pixcir_i2c_ts_suspend(struct device *dev)
>                         }
>                 }
> 
> -               enable_irq_wake(client->irq);
>         } else if (input->users) {
>                 ret = pixcir_stop(ts);
>         }
> @@ -386,7 +385,6 @@ 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);
> @@ -464,7 +462,7 @@ static int pixcir_i2c_ts_probe(struct i2c_client
> *client,
>         struct pixcir_i2c_ts_data *tsdata;
>         struct input_dev *input;
>         int error;
> -
> +printk("PROBING PIXCIR\n");
>         if (np && !pdata) {
>                 pdata = pixcir_parse_dt(dev);
>                 if (IS_ERR(pdata))
> @@ -562,14 +560,6 @@ static int pixcir_i2c_ts_probe(struct i2c_client
> *client,
>                 return error;
> 
>         i2c_set_clientdata(client, tsdata);
> -       device_init_wakeup(&client->dev, 1);
> -
> -       return 0;
> -}
> -
> -static int pixcir_i2c_ts_remove(struct i2c_client *client)
> -{
> -       device_init_wakeup(&client->dev, 0);
> 
>         return 0;
>  }
> @@ -608,7 +598,6 @@ static struct i2c_driver pixcir_i2c_ts_driver = {
>                 .of_match_table = of_match_ptr(pixcir_of_match),
>         },
>         .probe          = pixcir_i2c_ts_probe,
> -       .remove         = pixcir_i2c_ts_remove,
>         .id_table       = pixcir_i2c_ts_id,
>  };
> >>> @@ -659,20 +672,34 @@ static int i2c_device_probe(struct device *dev)
> >>>  	if y i2c(!device_can_wakeup(&client->dev))
> >>>  		device_init_wakeup(&client->dev,
> >>>  					client->flags & I2C_CLIENT_WAKE);
> >>> +
> >>> +	status = wakeirq > 0 ?
> >>> +			dev_pm_set_dedicated_wake_irq(dev, wakeirq) :
> >>> +			(client->irq > 0 ?
> >>> +				dev_pm_set_wake_irq(dev, client->irq) : 0);
> >>
> >> Above code tries to register wakeirq irrespective of whether the device
> >> is specified as wakeup-source in the dt or not. Hence, I see warn
> >> messages from every i2c device that has irq line but hasn't declared
> >> itself as wakeup-source:
> >> For example tps is on i2c:
> >> [    1.961613] tps65218 0-0024: forgot to call call device_init_wakeup?
> >> [    1.968340] tps65218 0-0024: failed to set up wakeup irq
> >>
> >> May be you can register wakeup-source only if I2C_CLIENT_WAKE flag is
> >> set in client->flags?
> > 
> > Makes sense, I'll prepare a new version.
> > 
> > Just to confirm: do you see any issues with these 2 patches if you do
> > not modify the drivers to drop calls enable_irq_wake() from them?
> 
> No, I didn't test w/o dropping enable_irq_wake() calls. I will do that
> tomo. Is this to verify that these 2 patches can be added w/o dropping
> enable_irq_wake() from other i2c drivers currently using them?

Yes.

Thanks.

-- 
Dmitry

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Vignesh R]

On 07/28/2015 11:37 PM, Dmitry Torokhov wrote:
> On Tue, Jul 28, 2015 at 11:16:44PM +0530, R, Vignesh wrote:
>> Hi,
>>
>> On 7/28/2015 10:53 PM, Dmitry Torokhov wrote:
>>> On Tue, Jul 28, 2015 at 06:53:52PM +0530, Vignesh R wrote:
>>>> Hi Dmitry,
>>>>
>>>> On 07/25/2015 01:46 AM, Dmitry Torokhov wrote:
>>>>> On Fri, Jul 24, 2015 at 12:26:19PM -0700, Dmitry Torokhov wrote:
>>>>>> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
>>>>>>> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
>>>>>>> <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>>>>>>> Sometimes drivers might wish to transition from index-based to named
>>>>>>>> interrupt descriptions. To aid in decision-making when parsing device
>>>>>>>> tree data let's provide a helper that will indicate the scheme that is
>>>>>>>> being used.
>>>>>>>
>>>>>>> Generally, IRQs are retrieved by platform_get_irq or
>>>>>>> platform_get_irq_byname. Drivers should not call the of_irq_*
>>>>>>> functions directly in most cases.
>>>>>>
>>>>>> That would be true for platform drivers, but not all devices are
>>>>>> platform devices.
>>>>>>
>>>>>>>
>>>>>>>>
>>>>>>>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>>>>>>>> ---
>>>>>>>>
>>>>>>>> The intent is to it like this:
>>>>>>>>
>>>>>>>>         if (of_has_named_irqs(np) {
>>>>>>>>                 /* Wake IRQ is optional */
>>>>>>>>                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
>>>>>>>>                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
>>>>>>>>                         return dev->wakeirq;
>>>>>>>>         }
>>>>>>>
>>>>>>> of_irq_get_byname will already return an error if the property is not
>>>>>>> present. Use that.
>>>>>>
>>>>>> I do not like that it returns -EINVAL when property is missing, can we
>>>>>> change it to return -ENODATA (so it is the same as when the property is
>>>>>> defined but such name is missing)?
>>>>>
>>>>> So here is what I had in mind.. It is based on recent patch by Vignesh
>>>>> for pixcir touchscreen, but I think it should be made available to all
>>>>> I2C devices. Completely untested at the moment.
>>>>>
>>>>
>>>> Thanks for the patch! I tested this on am437x-gp-evm and the
>>>> suspend/resume worked fine (below patch + $subject patch). I was able to
>>>> wake the system from low power state using touchscreen. Also verified
>>>> module insertion and removal. One comment though, please see below.
>>>>
>>>>> ---
>>>>>  drivers/i2c/i2c-core.c |   43 +++++++++++++++++++++++++++++++++++++------
>>>>>  1 file changed, 37 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
>>>>> index e6d4935..3971461 100644
>>>>> --- a/drivers/i2c/i2c-core.c
>>>>> +++ b/drivers/i2c/i2c-core.c
>>>>> @@ -47,6 +47,7 @@
>>>>>  #include <linux/rwsem.h>
>>>>>  #include <linux/pm_runtime.h>
>>>>>  #include <linux/pm_domain.h>
>>>>> +#include <linux/pm_wakeirq.h>
>>>>>  #include <linux/acpi.h>
>>>>>  #include <linux/jump_label.h>
>>>>>  #include <asm/uaccess.h>
>>>>> @@ -631,6 +632,7 @@ static int i2c_device_probe(struct device *dev)
>>>>>  {
>>>>>  	struct i2c_client	*client = i2c_verify_client(dev);
>>>>>  	struct i2c_driver	*driver;
>>>>> +	int wakeirq = 0;
>>>>>  	int status;
>>>>>  
>>>>>  	if (!client)
>>>>> @@ -639,11 +641,13 @@ static int i2c_device_probe(struct device *dev)
>>>>>  	if (!client->irq) {
>>>>>  		int irq = -ENOENT;
>>>>>  
>>>>> -		if (dev->of_node)
>>>>> -			irq = of_irq_get(dev->of_node, 0);
>>>>> -		else if (ACPI_COMPANION(dev))
>>>>> +		if (dev->of_node) {
>>>>> +			irq = of_has_named_irqs(dev->of_node) ?
>>>>> +				of_irq_get_byname(dev->of_node, "irq") :
>>>>> +				of_irq_get(dev->of_node, 0);
>>>>> +		} else if (ACPI_COMPANION(dev)) {
>>>>>  			irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
>>>>> -
>>>>> +		}
>>>>>  		if (irq == -EPROBE_DEFER)
>>>>>  			return irq;
>>>>>  		if (irq < 0)
>>>>> @@ -652,6 +656,15 @@ static int i2c_device_probe(struct device *dev)
>>>>>  		client->irq = irq;
>>>>>  	}
>>>>>  
>>>>> +	if (dev->of_node && of_has_named_irqs(dev->of_node)) {
>>>>> +		wakeirq = of_irq_get_byname(dev->of_node, "wakeup");
>>>>> +		if (wakeirq < 0) {
>>>>> +			if (wakeirq != -ENODATA)
>>>>> +				return wakeirq;
>>>>> +			wakeirq = 0;
>>>>> +		}
>>>>> +	}
>>>>> +
>>>>>  	driver = to_i2c_driver(dev->driver);
>>>>>  	if (!driver->probe || !driver->id_table)
>>>>>  		return -ENODEV;diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
>> index 8f3e243a62bf..6bd1d1ca9883 100644
>> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
>> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
>> @@ -365,7 +365,6 @@ static int __maybe_unused
>> pixcir_i2c_ts_suspend(struct device *dev)
>>                         }
>>                 }
>>
>> -               enable_irq_wake(client->irq);
>>         } else if (input->users) {
>>                 ret = pixcir_stop(ts);
>>         }
>> @@ -386,7 +385,6 @@ 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);
>> @@ -464,7 +462,7 @@ static int pixcir_i2c_ts_probe(struct i2c_client
>> *client,
>>         struct pixcir_i2c_ts_data *tsdata;
>>         struct input_dev *input;
>>         int error;
>> -
>> +printk("PROBING PIXCIR\n");
>>         if (np && !pdata) {
>>                 pdata = pixcir_parse_dt(dev);
>>                 if (IS_ERR(pdata))
>> @@ -562,14 +560,6 @@ static int pixcir_i2c_ts_probe(struct i2c_client
>> *client,
>>                 return error;
>>
>>         i2c_set_clientdata(client, tsdata);
>> -       device_init_wakeup(&client->dev, 1);
>> -
>> -       return 0;
>> -}
>> -
>> -static int pixcir_i2c_ts_remove(struct i2c_client *client)
>> -{
>> -       device_init_wakeup(&client->dev, 0);
>>
>>         return 0;
>>  }
>> @@ -608,7 +598,6 @@ static struct i2c_driver pixcir_i2c_ts_driver = {
>>                 .of_match_table = of_match_ptr(pixcir_of_match),
>>         },
>>         .probe          = pixcir_i2c_ts_probe,
>> -       .remove         = pixcir_i2c_ts_remove,
>>         .id_table       = pixcir_i2c_ts_id,
>>  };
>>>>> @@ -659,20 +672,34 @@ static int i2c_device_probe(struct device *dev)
>>>>>  	if y i2c(!device_can_wakeup(&client->dev))
>>>>>  		device_init_wakeup(&client->dev,
>>>>>  					client->flags & I2C_CLIENT_WAKE);
>>>>> +
>>>>> +	status = wakeirq > 0 ?
>>>>> +			dev_pm_set_dedicated_wake_irq(dev, wakeirq) :
>>>>> +			(client->irq > 0 ?
>>>>> +				dev_pm_set_wake_irq(dev, client->irq) : 0);
>>>>
>>>> Above code tries to register wakeirq irrespective of whether the device
>>>> is specified as wakeup-source in the dt or not. Hence, I see warn
>>>> messages from every i2c device that has irq line but hasn't declared
>>>> itself as wakeup-source:
>>>> For example tps is on i2c:
>>>> [    1.961613] tps65218 0-0024: forgot to call call device_init_wakeup?
>>>> [    1.968340] tps65218 0-0024: failed to set up wakeup irq
>>>>
>>>> May be you can register wakeup-source only if I2C_CLIENT_WAKE flag is
>>>> set in client->flags?
>>>
>>> Makes sense, I'll prepare a new version.
>>>
>>> Just to confirm: do you see any issues with these 2 patches if you do
>>> not modify the drivers to drop calls enable_irq_wake() from them?
>>
>> No, I didn't test w/o dropping enable_irq_wake() calls. I will do that
>> tomo. Is this to verify that these 2 patches can be added w/o dropping
>> enable_irq_wake() from other i2c drivers currently using them?
> 
> Yes.

Tested these 2 patches with enable/disable_irq_wake() calls in pixcir
driver and I did not see any issues.

-- 
Regards
Vignesh

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Rob Herring]

On Fri, Jul 24, 2015 at 2:26 PM, Dmitry Torokhov
<dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
>> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
>> <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> > Sometimes drivers might wish to transition from index-based to named
>> > interrupt descriptions. To aid in decision-making when parsing device
>> > tree data let's provide a helper that will indicate the scheme that is
>> > being used.
>>
>> Generally, IRQs are retrieved by platform_get_irq or
>> platform_get_irq_byname. Drivers should not call the of_irq_*
>> functions directly in most cases.
>
> That would be true for platform drivers, but not all devices are
> platform devices.

I should say for drivers, IRQs are retrieved by a bus specific method,
not DT functions. There are 3 cases of drivers using them:

arch/arm/mach-omap2/prm3xxx.c:                  irq_num = of_irq_get(np, 0);
arch/arm/mach-omap2/prm44xx.c:  irq_num = of_irq_get(prm_init_data->np, 0);
drivers/pinctrl/sirf/pinctrl-atlas7.c:          ret = of_irq_get(np, idx);

>> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> > ---
>> >
>> > The intent is to it like this:
>> >
>> >         if (of_has_named_irqs(np) {
>> >                 /* Wake IRQ is optional */
>> >                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
>> >                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
>> >                         return dev->wakeirq;
>> >         }
>>
>> of_irq_get_byname will already return an error if the property is not
>> present. Use that.
>
> I do not like that it returns -EINVAL when property is missing, can we
> change it to return -ENODATA (so it is the same as when the property is
> defined but such name is missing)?

It may be useful to distinguish between those cases. If you want audit
all the callers we could possibly change it though.

Really, I don't understand why you would care about any error code
other than EPROBE_DEFER. If it is optional, then you would want to
continue no matter what is returned.

Rob
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Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Dmitry Torokhov]

On Fri, Jul 24, 2015 at 03:59:39PM -0500, Rob Herring wrote:
> On Fri, Jul 24, 2015 at 2:26 PM, Dmitry Torokhov
> <dmitry.torokhov@gmail.com> wrote:
> > On Fri, Jul 24, 2015 at 02:14:57PM -0500, Rob Herring wrote:
> >> On Fri, Jul 24, 2015 at 1:26 PM, Dmitry Torokhov
> >> <dmitry.torokhov@gmail.com> wrote:
> >> > Sometimes drivers might wish to transition from index-based to named
> >> > interrupt descriptions. To aid in decision-making when parsing device
> >> > tree data let's provide a helper that will indicate the scheme that is
> >> > being used.
> >>
> >> Generally, IRQs are retrieved by platform_get_irq or
> >> platform_get_irq_byname. Drivers should not call the of_irq_*
> >> functions directly in most cases.
> >
> > That would be true for platform drivers, but not all devices are
> > platform devices.
> 
> I should say for drivers, IRQs are retrieved by a bus specific method,
> not DT functions. There are 3 cases of drivers using them:
> 
> arch/arm/mach-omap2/prm3xxx.c:                  irq_num = of_irq_get(np, 0);
> arch/arm/mach-omap2/prm44xx.c:  irq_num = of_irq_get(prm_init_data->np, 0);
> drivers/pinctrl/sirf/pinctrl-atlas7.c:          ret = of_irq_get(np, idx);

Right, but I think with the newer wakeirq infrastructure we may start
seeing them for non-platform devices unless we push it into bus code (as
I've attempted to do in the patch I sent in the other email). 

> 
> >> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> >> > ---
> >> >
> >> > The intent is to it like this:
> >> >
> >> >         if (of_has_named_irqs(np) {
> >> >                 /* Wake IRQ is optional */
> >> >                 dev->wakeirq = of_irq_get_byname(np, "wakeup");
> >> >                 if (dev->wakeirq < 0 && dev->wakeirq != -ENODATA)
> >> >                         return dev->wakeirq;
> >> >         }
> >>
> >> of_irq_get_byname will already return an error if the property is not
> >> present. Use that.
> >
> > I do not like that it returns -EINVAL when property is missing, can we
> > change it to return -ENODATA (so it is the same as when the property is
> > defined but such name is missing)?
> 
> It may be useful to distinguish between those cases. If you want audit
> all the callers we could possibly change it though.

It looks like the only user of of_irq_get_byname() is
platform_get_irq_byname() and it doe snot care about anything but
-EPROBE_DEFER, so my audit effort is complete ;)

> 
> Really, I don't understand why you would care about any error code
> other than EPROBE_DEFER. If it is optional, then you would want to
> continue no matter what is returned.

No, I only want to proceed if it is not there. If there are errors (in
DTS, elsewhere in the kernel) I want to let the user know and abort.

Thanks.

-- 
Dmitry

Re: [PATCH] of/irq: introduce of_has_named_irqs helper

[Florian Fainelli]

On 24/07/15 11:26, Dmitry Torokhov wrote:
> Sometimes drivers might wish to transition from index-based to named
> interrupt descriptions. To aid in decision-making when parsing device
> tree data let's provide a helper that will indicate the scheme that is
> being used.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---

[snip]

> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index 3cf7a01..e02c43e 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -384,6 +384,19 @@ int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
>  EXPORT_SYMBOL_GPL(of_irq_to_resource);
>  
>  /**
> + * of_has_named_irq - Check if given node contains named interrupts
> + * @dev: pointer to device tree node
> + *
> + * Returns %true if node contains non-empty "interrupt-names" property.
> + */
> +bool of_has_named_irqs(struct device_node *dev)
> +{
> +	struct property *prop = of_find_property(dev, "interrupt-names", NULL);
> +
> +	return prop && prop->value;
> +}

Missing EXPORT_SYMBOL_GPL() here?
-- 
Florian
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