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firmware: arm_scmi: Add multiple protocols registration support

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Add the capability for a SCMI driver to register to the core SCMI stack
with multiple SCMI protocols. In such a case the SCMI driver probe
function will end up being called once for each registered protocol
which have been also found as implemented on the platform.

This is especially useful in testing scenarios.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20231221151129.325749-1-cristian.marussi@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Cristian Marussi 2023-12-21 15:11:29 +00:00 • committed by Sudeep Holla
parent dea893a66c
commit 2858f6e5f0
1 changed files with 22 additions and 2 deletions
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24
drivers/firmware/arm_scmi/bus.c
View file

@ -141,6 +141,17 @@ out:
return ret;
}
static int scmi_protocol_table_register(const struct scmi_device_id *id_table)
{
int ret = 0;
const struct scmi_device_id *entry;
for (entry = id_table; entry->name && ret == 0; entry++)
ret = scmi_protocol_device_request(entry);
return ret;
}
/**
* scmi_protocol_device_unrequest - Helper to unrequest a device
*
@ -186,6 +197,15 @@ static void scmi_protocol_device_unrequest(const struct scmi_device_id *id_table
mutex_unlock(&scmi_requested_devices_mtx);
}
static void
scmi_protocol_table_unregister(const struct scmi_device_id *id_table)
{
const struct scmi_device_id *entry;
for (entry = id_table; entry->name; entry++)
scmi_protocol_device_unrequest(entry);
}
static const struct scmi_device_id *
scmi_dev_match_id(struct scmi_device *scmi_dev, struct scmi_driver *scmi_drv)
{
@ -279,7 +299,7 @@ int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
if (!driver->probe)
return -EINVAL;
retval = scmi_protocol_device_request(driver->id_table);
retval = scmi_protocol_table_register(driver->id_table);
if (retval)
return retval;
@ -299,7 +319,7 @@ EXPORT_SYMBOL_GPL(scmi_driver_register);
void scmi_driver_unregister(struct scmi_driver *driver)
{
driver_unregister(&driver->driver);
scmi_protocol_device_unrequest(driver->id_table);
scmi_protocol_table_unregister(driver->id_table);
}
EXPORT_SYMBOL_GPL(scmi_driver_unregister);