of/pci: Add of_pci_dma_configure() to update DMA configuration
Add of_pci_dma_configure() to allow updating the DMA configuration of the
PCI device using the configuration from DT of the parent of the root bridge
device. Use the newly added APIs pci_get/put_host_bridge_device() for
implementing this.
[bhelgaas: fold in fix for host bridges with no parent OF device]
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> (AMD Seattle)
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Rob Herring <robh+dt@kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>
CC: Joerg Roedel <joro@8bytes.org>
CC: Grant Likely <grant.likely@linaro.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: Arnd Bergmann <arnd@arndb.de>
diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h
index ce0e5ab..29fd3fe 100644
--- a/include/linux/of_pci.h
+++ b/include/linux/of_pci.h
@@ -16,6 +16,7 @@
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);
+void of_pci_dma_configure(struct pci_dev *pci_dev);
#else
static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq)
{
@@ -50,6 +51,8 @@
{
return -1;
}
+
+static inline void of_pci_dma_configure(struct pci_dev *pci_dev) { }
#endif
#if defined(CONFIG_OF_ADDRESS)