From d82ba4c0b457f0cb30da7bbee935aad7793e5fac Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Thu, 2 Jul 2015 18:15:38 -0600 Subject: dm: core: Support finding a device by phandle It is common for one node to reference another via a phandle. Add support for obtaining an attached device by this method. As an example, a node may have a 'power-supply' property which references a regulator, allowing the driver to turn on its power. Signed-off-by: Simon Glass --- drivers/core/uclass.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'drivers/core') diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c index ffe6995..5c4a66d 100644 --- a/drivers/core/uclass.c +++ b/drivers/core/uclass.c @@ -273,6 +273,37 @@ static int uclass_find_device_by_of_offset(enum uclass_id id, int node, return -ENODEV; } +static int uclass_find_device_by_phandle(enum uclass_id id, + struct udevice *parent, + const char *name, + struct udevice **devp) +{ + struct udevice *dev; + struct uclass *uc; + int find_phandle; + int ret; + + *devp = NULL; + find_phandle = fdtdec_get_int(gd->fdt_blob, parent->of_offset, name, + -1); + if (find_phandle <= 0) + return -ENOENT; + ret = uclass_get(id, &uc); + if (ret) + return ret; + + list_for_each_entry(dev, &uc->dev_head, uclass_node) { + uint phandle = fdt_get_phandle(gd->fdt_blob, dev->of_offset); + + if (phandle == find_phandle) { + *devp = dev; + return 0; + } + } + + return -ENODEV; +} + int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp) { @@ -338,6 +369,17 @@ 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_phandle(enum uclass_id id, struct udevice *parent, + const char *name, struct udevice **devp) +{ + struct udevice *dev; + int ret; + + *devp = NULL; + ret = uclass_find_device_by_phandle(id, parent, name, &dev); + return uclass_get_device_tail(dev, ret, devp); +} + int uclass_first_device(enum uclass_id id, struct udevice **devp) { struct udevice *dev; -- cgit v1.1