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i2c: support gpio-binding for SMBAlerts

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Most I2C controllers do not have a dedicated pin for SMBus Alerts. Allow
them to define a GPIO as a side-channel.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Wolfram Sang 2024-09-09 13:02:56 +02:00
parent 6b238b3c45
commit 270cc3c54e
2 changed files with 22 additions and 9 deletions
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9
drivers/i2c/i2c-core-smbus.c
View File

@ -712,12 +712,15 @@ int i2c_setup_smbus_alert(struct i2c_adapter *adapter)
if (!parent)
return 0;
/* Report serious errors */
irq = device_property_match_string(parent, "interrupt-names", "smbus_alert");
if (irq == -EINVAL || irq == -ENODATA)
return 0;
else if (irq < 0)
if (irq < 0 && irq != -EINVAL && irq != -ENODATA)
return irq;
/* Skip setup when no irq was found */
if (irq < 0 && !device_property_present(parent, "smbalert-gpios"))
return 0;
return PTR_ERR_OR_ZERO(i2c_new_smbus_alert_device(adapter, NULL));
}
#endif

22
drivers/i2c/i2c-smbus.c
View File

@ -8,6 +8,7 @@
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/i2c-smbus.h>
#include <linux/interrupt.h>
@ -167,6 +168,8 @@ static int smbalert_probe(struct i2c_client *ara)
struct i2c_smbus_alert_setup *setup = dev_get_platdata(&ara->dev);
struct i2c_smbus_alert *alert;
struct i2c_adapter *adapter = ara->adapter;
unsigned long irqflags = IRQF_SHARED | IRQF_ONESHOT;
struct gpio_desc *gpiod;
int res, irq;
alert = devm_kzalloc(&ara->dev, sizeof(struct i2c_smbus_alert),
@ -179,18 +182,25 @@ static int smbalert_probe(struct i2c_client *ara)
} else {
irq = fwnode_irq_get_byname(dev_fwnode(adapter->dev.parent),
"smbus_alert");
if (irq <= 0)
return irq;
if (irq <= 0) {
gpiod = devm_gpiod_get(adapter->dev.parent, "smbalert", GPIOD_IN);
if (IS_ERR(gpiod))
return PTR_ERR(gpiod);
irq = gpiod_to_irq(gpiod);
if (irq <= 0)
return irq;
irqflags |= IRQF_TRIGGER_FALLING;
}
}
INIT_WORK(&alert->alert, smbalert_work);
alert->ara = ara;
if (irq > 0) {
res = devm_request_threaded_irq(&ara->dev, irq,
NULL, smbus_alert,
IRQF_SHARED | IRQF_ONESHOT,
"smbus_alert", alert);
res = devm_request_threaded_irq(&ara->dev, irq, NULL, smbus_alert,
irqflags, "smbus_alert", alert);
if (res)
return res;
}