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slimbus: core: add of_slim_device_get() helper 

On SLIMBus controllers like Qcom NGD(non ported device), controller
can request logical address once the remote side is powered, having a
helper function like this to explicitly enumerate the bus is helpful.
Also codec drivers which are taking to interface device would need
such a helper too.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Srinivas Kandagatla 2018-06-19 17:12:57 +01:00 committed by Greg Kroah-Hartman
parent ba883d90b1
commit e0772de8a4
2 changed files with 41 additions and 0 deletions
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39
drivers/slimbus/core.c
View File

@ -356,6 +356,45 @@ struct slim_device *slim_get_device(struct slim_controller *ctrl,
}
EXPORT_SYMBOL_GPL(slim_get_device);
static int of_slim_match_dev(struct device *dev, void *data)
{
struct device_node *np = data;
struct slim_device *sbdev = to_slim_device(dev);
return (sbdev->dev.of_node == np);
}
static struct slim_device *of_find_slim_device(struct slim_controller *ctrl,
struct device_node *np)
{
struct slim_device *sbdev;
struct device *dev;
dev = device_find_child(ctrl->dev, np, of_slim_match_dev);
if (dev) {
sbdev = to_slim_device(dev);
return sbdev;
}
return NULL;
}
/**
* of_slim_get_device() - get handle to a device using dt node.
*
* @ctrl: Controller on which this device will be added/queried
* @np: node pointer to device
*
* Return: pointer to a device if it has already reported. Creates a new
* device and returns pointer to it if the device has not yet enumerated.
*/
struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
struct device_node *np)
{
return of_find_slim_device(ctrl, np);
}
EXPORT_SYMBOL_GPL(of_slim_get_device);
static int slim_device_alloc_laddr(struct slim_device *sbdev,
bool report_present)
{

2
include/linux/slimbus.h
View File

@ -138,6 +138,8 @@ static inline void slim_set_devicedata(struct slim_device *dev, void *data)
dev_set_drvdata(&dev->dev, data);
}
struct slim_device *of_slim_get_device(struct slim_controller *ctrl,
struct device_node *np);
struct slim_device *slim_get_device(struct slim_controller *ctrl,
struct slim_eaddr *e_addr);
int slim_get_logical_addr(struct slim_device *sbdev);