From a0dabd1848e3e857fe6b6b882278a96b62614ba2 Mon Sep 17 00:00:00 2001 From: Aaron Durbin Date: Wed, 25 Jul 2018 08:49:19 -0600 Subject: device: add child traversal helper function Add a function, dev_bus_each_child(), which walks through all the children for a given bus of a device. This helper allows one to walk through all the children of a given device's bus. BUG=b:111808427,b:111743717 TEST=built Change-Id: Iedceb0d19c05b7abd5a48f8dc30f85461bef5ec6 Signed-off-by: Aaron Durbin Reviewed-on: https://review.coreboot.org/27636 Tested-by: build bot (Jenkins) Reviewed-by: Justin TerAvest --- src/device/device_const.c | 24 ++++++++++++++++++++++++ src/include/device/device.h | 3 +++ 2 files changed, 27 insertions(+) (limited to 'src') diff --git a/src/device/device_const.c b/src/device/device_const.c index ee64bd13e6..90b68679e9 100644 --- a/src/device/device_const.c +++ b/src/device/device_const.c @@ -216,3 +216,27 @@ DEVTREE_CONST struct device *dev_find_slot_pnp(u16 port, u16 device) } return 0; } + +/** + * Given a device and previous match iterate through all the children. + * + * @param bus parent device's bus holding all the children + * @param prev_child previous child already traversed, if NULL start at + * children of parent bus. + * @return pointer to child or NULL when no more children + */ +DEVTREE_CONST struct device *dev_bus_each_child(const struct bus *parent, + DEVTREE_CONST struct device *prev_child) +{ + DEVTREE_CONST struct device *dev; + + if (parent == NULL) + return NULL; + + if (prev_child == NULL) + dev = parent->children; + else + dev = prev_child->sibling; + + return dev; +} diff --git a/src/include/device/device.h b/src/include/device/device.h index 64add5dc1b..1c8f1db3c0 100644 --- a/src/include/device/device.h +++ b/src/include/device/device.h @@ -1,4 +1,5 @@ #ifndef DEVICE_H + #define DEVICE_H /* @@ -275,6 +276,8 @@ DEVTREE_CONST struct device *dev_find_next_pci_device( DEVTREE_CONST struct device *dev_find_slot_on_smbus(unsigned int bus, unsigned int addr); DEVTREE_CONST struct device *dev_find_slot_pnp(u16 port, u16 device); +DEVTREE_CONST struct device *dev_bus_each_child(const struct bus *parent, + DEVTREE_CONST struct device *prev_child); void scan_smbus(struct device *bus); void scan_generic_bus(struct device *bus); -- cgit v1.2.3