On Sun, 2018-05-20 at 15:28 +0200, Hans de Goede wrote:
> Some types of interrupts are retrieved in i2c_device_probe() because
> getting them might fail with -EPROBE_DEFER.
>
> So far we've always assumed the first IRQ (index 0) in the firmware-
> node
> is the one we want.
>
> At least with ACPI enumerated i2c-clients in some cases the firmware-
> node
> is shared between multiple i2c-clients so we need to be able to
> specify
> the index rather then hardcoding it at 0.
>
> This commit adds a new fwnode_irq_index member to i2c_board_info and
> i2c_client which allows specifying the index.
>
FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
P.S. I would go with 'unsigned int' for the index.
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/i2c/i2c-core-base.c | 7 +++++--
> include/linux/i2c.h | 5 +++++
> 2 files changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
> index 1ba40bb2b966..ae3fda2c96a4 100644
> --- a/drivers/i2c/i2c-core-base.c
> +++ b/drivers/i2c/i2c-core-base.c
> @@ -312,9 +312,11 @@ static int i2c_device_probe(struct device *dev)
> } else if (dev->of_node) {
> irq = of_irq_get_byname(dev->of_node, "irq");
> if (irq == -EINVAL || irq == -ENODATA)
> - irq = of_irq_get(dev->of_node, 0);
> + irq = of_irq_get(dev->of_node,
> + client-
> >fwnode_irq_index);
> } else if (ACPI_COMPANION(dev)) {
> - irq =
> acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0);
> + irq =
> acpi_dev_gpio_irq_get(ACPI_COMPANION(dev),
> + client-
> >fwnode_irq_index);
> }
> if (irq == -EPROBE_DEFER)
> return irq;
> @@ -724,6 +726,7 @@ i2c_new_device(struct i2c_adapter *adap, struct
> i2c_board_info const *info)
> client->flags = info->flags;
> client->addr = info->addr;
>
> + client->fwnode_irq_index = info->fwnode_irq_index;
> client->irq = info->irq;
> if (!client->irq)
> client->irq = i2c_dev_irq_from_resources(info-
> >resources,
> diff --git a/include/linux/i2c.h b/include/linux/i2c.h
> index 44ad14e016b5..7f9506714a5e 100644
> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -316,6 +316,8 @@ struct i2c_driver {
> * generic enough to hide second-sourcing and compatible
> revisions.
> * @adapter: manages the bus segment hosting this I2C device
> * @dev: Driver model device node for the slave.
> + * @fwnode_irq_index: some devices share a single fwnode, this tells
> + * i2c_device_probe() to use the Nth irq from the
> fwnode
> * @irq: indicates the IRQ generated by this device (if any)
> * @detected: member of an i2c_driver.clients list or i2c-core's
> * userspace_devices list
> @@ -334,6 +336,7 @@ struct i2c_client {
> char name[I2C_NAME_SIZE];
> struct i2c_adapter *adapter; /* the adapter we sit on
> */
> struct device dev; /* the device structure
> */
> + int fwnode_irq_index; /* index for irq lookup
> */
> int irq; /* irq issued by device
> */
> struct list_head detected;
> #if IS_ENABLED(CONFIG_I2C_SLAVE)
> @@ -400,6 +403,7 @@ static inline bool i2c_detect_slave_mode(struct
> device *dev) { return false; }
> * @properties: additional device properties for the device
> * @resources: resources associated with the device
> * @num_resources: number of resources in the @resources array
> + * @fwnode_irq_index: stored in i2c_client.fwnode_irq_index
> * @irq: stored in i2c_client.irq
> *
> * I2C doesn't actually support hardware probing, although
> controllers and
> @@ -425,6 +429,7 @@ struct i2c_board_info {
> const struct property_entry *properties;
> const struct resource *resources;
> unsigned int num_resources;
> + int fwnode_irq_index;
> int irq;
> };
>
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy
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