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dm: core: Add a way to find a device by ofnode

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Add a function which looks up a device by its node (either in live tree
or flat tree).

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2017-05-18 20:09:09 -06:00
parent 19c8205e68
commit 40bb637dae
3 changed files with 72 additions and 0 deletions
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37
drivers/core/uclass.c
View file

@ -8,6 +8,7 @@
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <dm/device.h>
@ -287,6 +288,30 @@ int uclass_find_device_by_of_offset(enum uclass_id id, int node,
return -ENODEV;
}
int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
struct udevice **devp)
{
struct uclass *uc;
struct udevice *dev;
int ret;
*devp = NULL;
if (!ofnode_valid(node))
return -ENODEV;
ret = uclass_get(id, &uc);
if (ret)
return ret;
list_for_each_entry(dev, &uc->dev_head, uclass_node) {
if (ofnode_equal(dev_ofnode(dev), node)) {
*devp = dev;
return 0;
}
}
return -ENODEV;
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
static int uclass_find_device_by_phandle(enum uclass_id id,
struct udevice *parent,
@ -407,6 +432,18 @@ int uclass_get_device_by_of_offset(enum uclass_id id, int node,
return uclass_get_device_tail(dev, ret, devp);
}
int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
struct udevice **devp)
{
struct udevice *dev;
int ret;
*devp = NULL;
ret = uclass_find_device_by_ofnode(id, node, &dev);
return uclass_get_device_tail(dev, ret, devp);
}
#if CONFIG_IS_ENABLED(OF_CONTROL)
int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
const char *name, struct udevice **devp)

18
include/dm/uclass-internal.h
View file

@ -10,6 +10,8 @@
#ifndef _DM_UCLASS_INTERNAL_H
#define _DM_UCLASS_INTERNAL_H
#include <dm/ofnode.h>
/**
* uclass_get_device_tail() - handle the end of a get_device call
*
@ -114,6 +116,22 @@ int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
int uclass_find_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp);
/**
* uclass_find_device_by_of_node() - Find a uclass device by device tree node
*
* This searches the devices in the uclass for one attached to the given
* device tree node.
*
* The device is NOT probed, it is merely returned.
*
* @id: ID to look up
* @node: Device tree offset to search for (if NULL then -ENODEV is returned)
* @devp: Returns pointer to device (there is only one for each node)
* @return 0 if OK, -ve on error
*/
int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
struct udevice **devp);
/**
* uclass_bind_device() - Associate device with a uclass
*

17
include/dm/uclass.h
View file

@ -10,6 +10,7 @@
#ifndef _DM_UCLASS_H
#define _DM_UCLASS_H
#include <dm/ofnode.h>
#include <dm/uclass-id.h>
#include <linker_lists.h>
#include <linux/list.h>
@ -185,6 +186,22 @@ int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp);
int uclass_get_device_by_of_offset(enum uclass_id id, int node,
struct udevice **devp);
/**
* uclass_get_device_by_ofnode() - Get a uclass device by device tree node
*
* This searches the devices in the uclass for one attached to the given
* device tree node.
*
* The device is probed to activate it ready for use.
*
* @id: ID to look up
* @np: Device tree node to search for (if NULL then -ENODEV is returned)
* @devp: Returns pointer to device (there is only one for each node)
* @return 0 if OK, -ve on error
*/
int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
struct udevice **devp);
/**
* uclass_get_device_by_phandle() - Get a uclass device by phandle
*