[PATCHv9 05/12] PCI: mobiveil: Add callback function for interrupt initialization

["Z.q. Hou" <zhiqiang.hou@nxp.com>]

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

The Mobiveil GPEX internal MSI/INTx controller may not be used
by other platforms in which the Mobiveil GPEX is integrated.
This patch is to allow these platforms to implement their
specific interrupt initialization.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
V9:
 - New patch splited from the #1 of V8 patches to make it easy to review.

 drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 3 +++
 drivers/pci/controller/mobiveil/pcie-mobiveil.h      | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
index 2cc424e78d33..3cd93df6fe6e 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
@@ -507,6 +507,9 @@ static int mobiveil_pcie_interrupt_init(struct mobiveil_pcie *pcie)
 	struct resource *res;
 	int ret;
 
+	if (rp->ops->interrupt_init)
+		return rp->ops->interrupt_init(pcie);
+
 	/* map MSI config resource */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "apb_csr");
 	pcie->apb_csr_base = devm_pci_remap_cfg_resource(dev, res);
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
index e3148078e9dd..18d85806a7fc 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
@@ -130,10 +130,17 @@ struct mobiveil_msi {			/* MSI information */
 	DECLARE_BITMAP(msi_irq_in_use, PCI_NUM_MSI);
 };
 
+struct mobiveil_pcie;
+
+struct mobiveil_rp_ops {
+	int (*interrupt_init)(struct mobiveil_pcie *pcie);
+};
+
 struct root_port {
 	char root_bus_nr;
 	void __iomem *config_axi_slave_base;	/* endpoint config base */
 	struct resource *ob_io_res;
+	struct mobiveil_rp_ops *ops;
 	int irq;
 	raw_spinlock_t intx_mask_lock;
 	struct irq_domain *intx_domain;
-- 
2.17.1