device: Add helper function to find matching device on bus
This change adds a helper function dev_find_matching_device_on_bus() which scans all the child devices on the given bus and calls a match function provided by the caller. It returns the first device that the match function returns true for, else NULL if no such device is found. Change-Id: I2e3332c0a175ab995c523f078f29a9f498f17931 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/40543 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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@ -70,6 +70,19 @@ DEVTREE_CONST struct device *dev_find_path(
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return result;
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}
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DEVTREE_CONST struct device *dev_find_matching_device_on_bus(const struct bus *bus,
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match_device_fn fn)
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{
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DEVTREE_CONST struct device *child = NULL;
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while ((child = dev_bus_each_child(bus, child)) != NULL) {
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if (fn(child))
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break;
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}
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return child;
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}
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/**
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* Given a device pointer, find the next PCI device.
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*
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@ -207,6 +207,19 @@ DEVTREE_CONST struct device *dev_find_path(
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struct device *dev_find_lapic(unsigned int apic_id);
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int dev_count_cpu(void);
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/*
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* Signature for matching function that is used by dev_find_matching_device_on_bus() to decide
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* if the device being considered is the one that matches the caller's criteria. This function
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* is supposed to return true if the provided device matches the criteria, else false.
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*/
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typedef bool (*match_device_fn)(DEVTREE_CONST struct device *dev);
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/*
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* Returns the first device on the bus that the match_device_fn returns true for. If no such
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* device is found, it returns NULL.
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*/
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DEVTREE_CONST struct device *dev_find_matching_device_on_bus(const struct bus *bus,
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match_device_fn fn);
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struct device *add_cpu_device(struct bus *cpu_bus, unsigned int apic_id,
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int enabled);
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void set_cpu_topology(struct device *cpu, unsigned int node,
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