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| author | Liviu Dudau <Liviu.Dudau@arm.com> | 2014-09-29 18:29:27 +0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-10-01 03:08:57 +0400 |
| commit | 41e5c0f81d3e676d671d96a0a1fafb27abfbd9d7 (patch) | |
| tree | 674d5c5bc98998014d5b454f059bb052660057d5 /include/linux/of_pci.h | |
| parent | 670ba0c8883b576d0aec28bd7a838358a4be1406 (diff) | |
| download | linux-41e5c0f81d3e676d671d96a0a1fafb27abfbd9d7.tar.xz | |
of/pci: Add pci_get_new_domain_nr() and of_get_pci_domain_nr()
Add pci_get_new_domain_nr() to allocate a new domain number and
of_get_pci_domain_nr() to retrieve the PCI domain number of a given device
from DT. Host bridge drivers or architecture-specific code can choose to
implement their PCI domain number policy using these two functions.
Using of_get_pci_domain_nr() guarantees a stable PCI domain number on every
boot provided that all host bridge controllers are assigned a number in the
device tree using "linux,pci-domain" property. Mixing use of
pci_get_new_domain_nr() and of_get_pci_domain_nr() is not recommended as it
can lead to potentially conflicting domain numbers being assigned to root
buses behind different host bridges.
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'include/linux/of_pci.h')
| -rw-r--r-- | include/linux/of_pci.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index dde3a4a0fa5d..71062e9602f5 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -15,6 +15,7 @@ struct device_node *of_pci_find_child_device(struct device_node *parent, int of_pci_get_devfn(struct device_node *np); int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin); int of_pci_parse_bus_range(struct device_node *node, struct resource *res); +int of_get_pci_domain_nr(struct device_node *node); #else static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) { @@ -43,6 +44,12 @@ of_pci_parse_bus_range(struct device_node *node, struct resource *res) { return -EINVAL; } + +static inline int +of_get_pci_domain_nr(struct device_node *node) +{ + return -1; +} #endif #if defined(CONFIG_OF) && defined(CONFIG_PCI_MSI) |