of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only"
Both pci-host-generic and Pseries parse the "linux,pci-probe-only" property
to engage the PCI_PROBE_ONLY mode, and both have a subtle bug that can be
triggered if the property has no parameter.
Provide a generic, safe implementation that can be used by both.
[bhelgaas: fold in #include <asm-generic/pci-bridge.h>]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
index 5751dc5..d0c8902 100644
--- a/drivers/of/of_pci.c
+++ b/drivers/of/of_pci.c
@@ -5,6 +5,7 @@
#include <linux/of_device.h>
#include <linux/of_pci.h>
#include <linux/slab.h>
+#include <asm-generic/pci-bridge.h>
static inline int __of_pci_pci_compare(struct device_node *node,
unsigned int data)
@@ -118,6 +119,31 @@
EXPORT_SYMBOL_GPL(of_get_pci_domain_nr);
/**
+ * of_pci_check_probe_only - Setup probe only mode if linux,pci-probe-only
+ * is present and valid
+ */
+void of_pci_check_probe_only(void)
+{
+ u32 val;
+ int ret;
+
+ ret = of_property_read_u32(of_chosen, "linux,pci-probe-only", &val);
+ if (ret) {
+ if (ret == -ENODATA || ret == -EOVERFLOW)
+ pr_warn("linux,pci-probe-only without valid value, ignoring\n");
+ return;
+ }
+
+ if (val)
+ pci_add_flags(PCI_PROBE_ONLY);
+ else
+ pci_clear_flags(PCI_PROBE_ONLY);
+
+ pr_info("PCI: PROBE_ONLY %sabled\n", val ? "en" : "dis");
+}
+EXPORT_SYMBOL_GPL(of_pci_check_probe_only);
+
+/**
* of_pci_dma_configure - Setup DMA configuration
* @dev: ptr to pci_dev struct of the PCI device
*