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Message-ID: <20150724201613.GB33241@dtor-ws>
Date: Fri, 24 Jul 2015 13:16:13 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Rob Herring <robherring2@...il.com>
Cc: Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Vignesh R <vigneshr@...com>, Tony Lindgren <tony@...mide.com>,
Benoit Cousson <bcousson@...libre.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Russell King <linux@....linux.org.uk>,
Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org
Subject: Re: [PATCH] of/irq: introduce of_has_named_irqs helper
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@...il.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@...il.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.
---
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
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