From a223e65db2e9d4c82bb8aac29281500b8e645a97 Mon Sep 17 00:00:00 2001 From: Rob Barnes Date: Thu, 23 Jul 2020 08:25:42 -0600 Subject: device: Add find_dev_nested_path helper function Add find_dev_nested_path helper function to simplify finding deeply nested devices. BUG=b:157580724 TEST=Find bluetooth device on dalboz Change-Id: I48fa5fcad0030fb6dcea97b9fc76e1d3d3f9b28f Signed-off-by: Rob Barnes Reviewed-on: https://review.coreboot.org/c/coreboot/+/43776 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh Reviewed-by: Raul Rangel --- src/device/device_const.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'src/device/device_const.c') diff --git a/src/device/device_const.c b/src/device/device_const.c index 12d5386d22..79f025da97 100644 --- a/src/device/device_const.c +++ b/src/device/device_const.c @@ -196,6 +196,33 @@ DEVTREE_CONST struct device *find_dev_path( return child; } +/** + * Find the device structure given an array of nested device paths, + * + * @param parent The parent bus to start the search on. + * @param nested_path An array of relative paths from the parent bus to the target device. + * @param nested_path_length Number of path elements in nested_path array. + * @return Pointer to a device structure for the device at nested path + * or 0/NULL if no device is found. + */ +DEVTREE_CONST struct device *find_dev_nested_path( + const struct bus *parent, const struct device_path nested_path[], + size_t nested_path_length) +{ + DEVTREE_CONST struct device *child; + + if (!parent || !nested_path || !nested_path_length) + return NULL; + + child = find_dev_path(parent, nested_path); + + /* Terminate recursion at end of nested path or child not found */ + if (nested_path_length == 1 || !child) + return child; + + return find_dev_nested_path(child->link_list, nested_path + 1, nested_path_length - 1); +} + DEVTREE_CONST struct device *pcidev_path_behind( const struct bus *parent, pci_devfn_t devfn) { -- cgit v1.2.3