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spmi: add a helper to look up an SPMI device from a device node

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The helper function spmi_device_from_of() takes a device node and
returns the SPMI device associated with it.
This is like of_find_device_by_node but for SPMI devices.

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly 2022-03-23 16:28:12 +00:00 • committed by Jami Kettunen
parent 60f70f81ba
commit 39331eb8a6
2 changed files with 20 additions and 0 deletions
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17
drivers/spmi/spmi.c
View file

@ -386,6 +386,23 @@ static struct bus_type spmi_bus_type = {
.uevent = spmi_drv_uevent,
};
/**
* spmi_device_from_of() - get the associated SPMI device from a device node
*
* @np: device node
*
* Returns the struct spmi_device associated with a device node or NULL.
*/
struct spmi_device *spmi_device_from_of(struct device_node *np)
{
struct device *dev = bus_find_device_by_of_node(&spmi_bus_type, np);
if (dev)
return to_spmi_device(dev);
return NULL;
}
EXPORT_SYMBOL_GPL(spmi_device_from_of);
/**
* spmi_controller_alloc() - Allocate a new SPMI device
* @ctrl: associated controller

3
include/linux/spmi.h
View file

@ -164,6 +164,9 @@ static inline void spmi_driver_unregister(struct spmi_driver *sdrv)
module_driver(__spmi_driver, spmi_driver_register, \
spmi_driver_unregister)
struct device_node;
struct spmi_device *spmi_device_from_of(struct device_node *np);
int spmi_register_read(struct spmi_device *sdev, u8 addr, u8 *buf);
int spmi_ext_register_read(struct spmi_device *sdev, u8 addr, u8 *buf,
size_t len);