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i2c: do not enable fall back to Host Notify by default

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Falling back unconditionally to HostNotify as primary client's interrupt
breaks some drivers which alter their functionality depending on whether
interrupt is present or not, so let's introduce a board flag telling I2C
core explicitly if we want wired interrupt or HostNotify-based one:
I2C_CLIENT_HOST_NOTIFY.

For DT-based systems we introduce "host-notify" property that we convert
to I2C_CLIENT_HOST_NOTIFY board flag.

Tested-by: Benjamin Tissoires <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
Acked-by: Pali Rohár <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
This commit is contained in:
Dmitry Torokhov 2017-01-04 20:57:22 -08:00 • committed by Wolfram Sang
commit 331c342552
3 changed files with 17 additions and 9 deletions
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17
drivers/i2c/i2c-core.c
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@ -931,7 +931,10 @@ static int i2c_device_probe(struct device *dev)
if (!client->irq) {
int irq = -ENOENT;
if (dev->of_node) {
if (client->flags & I2C_CLIENT_HOST_NOTIFY) {
dev_dbg(dev, "Using Host Notify IRQ\n");
irq = i2c_smbus_host_notify_to_irq(client);
} 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);
@ -940,14 +943,7 @@ static int i2c_device_probe(struct device *dev)
}
if (irq == -EPROBE_DEFER)
return irq;
/*
* ACPI and OF did not find any useful IRQ, try to see
* if Host Notify can be used.
*/
if (irq < 0) {
dev_dbg(dev, "Using Host Notify IRQ\n");
irq = i2c_smbus_host_notify_to_irq(client);
}
if (irq < 0)
irq = 0;
@ -1716,6 +1712,9 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
info.of_node = of_node_get(node);
info.archdata = &dev_ad;
if (of_property_read_bool(node, "host-notify"))
info.flags |= I2C_CLIENT_HOST_NOTIFY;
if (of_get_property(node, "wakeup-source", NULL))
info.flags |= I2C_CLIENT_WAKE;