Hi Phil, On May 02 2017 or thereabouts, Phil Reid wrote: > This commit adds of_i2c_setup_smbus_alert which allows the smbalert > driver to be attached to an i2c adapter via the device tree. > > Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/i2c/i2c.txt | 4 +-- > drivers/i2c/i2c-smbus.c | 35 +++++++++++++++++++++++++++ > include/linux/i2c-smbus.h | 9 +++++++ > 3 files changed, 46 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt > index cee9d50..1126398 100644 > --- a/Documentation/devicetree/bindings/i2c/i2c.txt > +++ b/Documentation/devicetree/bindings/i2c/i2c.txt > @@ -59,8 +59,8 @@ wants to support one of the below features, it should adapt the bindings below. > interrupts used by the device. > > - interrupt-names > - "irq" and "wakeup" names are recognized by I2C core, other names are > - left to individual drivers. > + "irq", "wakeup" and "smbus_alert" names are recognized by I2C core, > + other names are left to individual drivers. > > - host-notify > device uses SMBus host notify protocol instead of interrupt line. > diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c > index df0e2fa..a8f8439 100644 > --- a/drivers/i2c/i2c-smbus.c > +++ b/drivers/i2c/i2c-smbus.c > @@ -21,6 +21,7 @@ > #include <linux/interrupt.h> > #include <linux/kernel.h> > #include <linux/module.h> > +#include <linux/of_irq.h> > #include <linux/slab.h> > #include <linux/workqueue.h> > > @@ -238,6 +239,40 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter, > } > EXPORT_SYMBOL_GPL(i2c_setup_smbus_alert); > > +int of_i2c_setup_smbus_alert(struct i2c_adapter *adap) > +{ > + struct i2c_client *client; > + struct i2c_smbus_alert_setup *setup; > + struct i2c_board_info info = { > + I2C_BOARD_INFO("smbus_alert", 0x0c), > + }; Shouldn't you use i2c_setup_smbus_alert() instead of manually recreating the board_info? Also i2c_setup_smbus_alert() mentions that the level trigger has to be explicitely mentioned, and I can't find if this is the case in your patch. > + int irq; > + > + if (!adap->dev.of_node) > + return 0; > + > + irq = of_irq_get_byname(adap->dev.of_node, "smbus_alert"); > + if (irq == -EINVAL || irq == -ENODATA) > + return 0; > + else if (irq < 0) > + return irq; > + > + setup = devm_kzalloc(&adap->dev, sizeof(struct i2c_smbus_alert_setup), > + GFP_KERNEL); Problem is i2c-core doesn't use devres at all for now. So the code is correct here as it won't segfault but mixing both devres and non-devres is error prone. > + if (!setup) > + return -ENOMEM; > + > + setup->irq = irq; > + info.platform_data = setup; > + > + client = i2c_new_device(adap, &info); > + if (!client) > + return -ENODEV; > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(of_i2c_setup_smbus_alert); > + > /** > * i2c_handle_smbus_alert - Handle an SMBus alert > * @ara: the ARA client on the relevant adapter > diff --git a/include/linux/i2c-smbus.h b/include/linux/i2c-smbus.h > index a138502..4732d09 100644 > --- a/include/linux/i2c-smbus.h > +++ b/include/linux/i2c-smbus.h > @@ -50,4 +50,13 @@ struct i2c_client *i2c_setup_smbus_alert(struct i2c_adapter *adapter, > struct i2c_smbus_alert_setup *setup); > int i2c_handle_smbus_alert(struct i2c_client *ara); > > +#if IS_ENABLED(CONFIG_I2C_SMBUS) > +int of_i2c_setup_smbus_alert(struct i2c_adapter *adap); > +#else > +static inline int of_i2c_setup_smbus_alert(struct i2c_adapter *adap) > +{ > + return 0; > +} > +#endif > + > #endif /* _LINUX_I2C_SMBUS_H */ > -- > 1.8.3.1 Cheers, Benjamin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html