PCI: iproc: Implement MSI controller node detection with of_msi_xlate()

The functionality implemented in the iproc driver in order to detect an
OF MSI controller node is now fully implemented in of_msi_xlate().

Replace the current msi-map/msi-parent parsing code with of_msi_xlate().

Since of_msi_xlate() is also a deviceID mapping API, pass in a fictitious
0 as deviceID - the driver only requires detecting the OF MSI controller
node not the deviceID mapping per-se (of_msi_xlate() return value is
ignored for the same reason).

Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20251021124103.198419-5-lpieralisi@kernel.org

diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
index 22134e95574bd8ef5dda949fa6f90d6bdd54f3f6..ccf71993ea3595e0f41835c3f8c1ef408b6e7470 100644 (file)
--- a/drivers/pci/controller/pcie-iproc.c
+++ b/drivers/pci/controller/pcie-iproc.c
@@ -17,6 +17,7 @@
 #include <linux/irqchip/arm-gic-v3.h>
 #include <linux/platform_device.h>
 #include <linux/of_address.h>
+#include <linux/of_irq.h>
 #include <linux/of_pci.h>
 #include <linux/of_platform.h>
 #include <linux/phy/phy.h>
@@ -1337,29 +1338,16 @@ static int iproc_pcie_msi_steer(struct iproc_pcie *pcie,
 
 static int iproc_pcie_msi_enable(struct iproc_pcie *pcie)
 {
-       struct device_node *msi_node;
+       struct device_node *msi_node = NULL;
        int ret;
 
        /*
         * Either the "msi-parent" or the "msi-map" phandle needs to exist
         * for us to obtain the MSI node.
         */
-
-       msi_node = of_parse_phandle(pcie->dev->of_node, "msi-parent", 0);
-       if (!msi_node) {
-               const __be32 *msi_map = NULL;
-               int len;
-               u32 phandle;
-
-               msi_map = of_get_property(pcie->dev->of_node, "msi-map", &len);
-               if (!msi_map)
-                       return -ENODEV;
-
-               phandle = be32_to_cpup(msi_map + 1);
-               msi_node = of_find_node_by_phandle(phandle);
-               if (!msi_node)
-                       return -ENODEV;
-       }
+       of_msi_xlate(pcie->dev, &msi_node, 0);
+       if (!msi_node)
+               return -ENODEV;
 
        /*
         * Certain revisions of the iProc PCIe controller require additional