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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-15 12:46:48 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-15 12:46:48 -0800
commit0ab7b12c49b6fbf2d4d0381374b82935f949be5f (patch)
tree7a1b48e644638c6a0a275e65715d8db37d20c88e /drivers/of
parenta9a16a6d136593c9e6f72e481b2b86ae1d8d1fce (diff)
parentb08d2e61a6f9ebf5210a047868362a5a4ff37144 (diff)
Merge tag 'pci-v4.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI updates from Bjorn Helgaas: "PCI changes: - add support for PCI on ARM64 boxes with ACPI. We already had this for theoretical spec-compliant hardware; now we're adding quirks for the actual hardware (Cavium, HiSilicon, Qualcomm, X-Gene) - add runtime PM support for hotplug ports - enable runtime suspend for Intel UHCI that uses platform-specific wakeup signaling - add yet another host bridge registration interface. We hope this is extensible enough to subsume the others - expose device revision in sysfs for DRM - to avoid device conflicts, make sure any VF BAR updates are done before enabling the VF - avoid unnecessary link retrains for ASPM - allow INTx masking on Mellanox devices that support it - allow access to non-standard VPD for Chelsio devices - update Broadcom iProc support for PAXB v2, PAXC v2, inbound DMA, etc - update Rockchip support for max-link-speed - add NVIDIA Tegra210 support - add Layerscape LS1046a support - update R-Car compatibility strings - add Qualcomm MSM8996 support - remove some uninformative bootup messages" * tag 'pci-v4.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (115 commits) PCI: Enable access to non-standard VPD for Chelsio devices (cxgb3) PCI: Expand "VPD access disabled" quirk message PCI: pciehp: Remove loading message PCI: hotplug: Remove hotplug core message PCI: Remove service driver load/unload messages PCI/AER: Log AER IRQ when claiming Root Port PCI/AER: Log errors with PCI device, not PCIe service device PCI/AER: Remove unused version macros PCI/PME: Log PME IRQ when claiming Root Port PCI/PME: Drop unused support for PMEs from Root Complex Event Collectors PCI: Move config space size macros to pci_regs.h x86/platform/intel-mid: Constify mid_pci_platform_pm PCI/ASPM: Don't retrain link if ASPM not possible PCI: iproc: Skip check for legacy IRQ on PAXC buses PCI: pciehp: Leave power indicator on when enabling already-enabled slot PCI: pciehp: Prioritize data-link event over presence detect PCI: rcar: Add gen3 fallback compatibility string for pcie-rcar PCI: rcar: Use gen2 fallback compatibility last PCI: rcar-gen2: Use gen2 fallback compatibility last PCI: rockchip: Move the deassert of pm/aclk/pclk after phy_init() ..
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/of_pci.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index b58be12ab277..0ee42c3e66a1 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -120,6 +120,27 @@ int of_get_pci_domain_nr(struct device_node *node)
EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
/**
+ * This function will try to find the limitation of link speed by finding
+ * a property called "max-link-speed" of the given device node.
+ *
+ * @node: device tree node with the max link speed information
+ *
+ * Returns the associated max link speed from DT, or a negative value if the
+ * required property is not found or is invalid.
+ */
+int of_pci_get_max_link_speed(struct device_node *node)
+{
+ u32 max_link_speed;
+
+ if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
+ max_link_speed > 4)
+ return -EINVAL;
+
+ return max_link_speed;
+}
+EXPORT_SYMBOL_GPL(of_pci_get_max_link_speed);
+
+/**
* of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
* is present and valid
*/