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
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