[PATCHv2] PCI: dwc: uniphier: use fwnode API for legacy-interrupt-controller

Convert uniphier_pcie_config_intx_irq() from the OF-specific to the
generic firmware-node API: of_get_child_by_name() to
device_get_named_child_node(), irq_of_parse_and_map() to
fwnode_irq_get(), of_fwnode_handle() on the child node to passing the
fwnode directly, and of_node_put() to fwnode_handle_put().

Unlike irq_of_parse_and_map(), fwnode_irq_get() returns a positive IRQ
or a negative errno and never 0 (it rewrites 0 to -EINVAL), so check
pp->irq < 0 and propagate the error. pp->irq is an int, so the negative
value is preserved. Drop the now-unused np / dev_fwnode() locals, since
device_get_named_child_node() operates on the device directly.

Built for arm64 (defconfig + CONFIG_PCIE_UNIPHIER) with LLVM=1;
drivers/pci/controller/dwc/pcie-uniphier.o compiles cleanly.

Assisted-by: opencode:hy3-free
Signed-off-by: Rosen Penev <[email protected]>
---
 v2: fix fwnode_irq_get() error propagation.
 drivers/pci/controller/dwc/pcie-uniphier.c | 25 +++++++++++-----------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-uniphier.c b/drivers/pci/controller/dwc/pcie-uniphier.c
index 297e7a3d9b36..29eb1b9abd26 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier.c
@@ -14,7 +14,6 @@
 #include <linux/iopoll.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
-#include <linux/of_irq.h>
 #include <linux/pci.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
@@ -262,27 +261,27 @@ static int uniphier_pcie_config_intx_irq(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct uniphier_pcie *pcie = to_uniphier_pcie(pci);
-	struct device_node *np = pci->dev->of_node;
-	struct device_node *np_intc;
+	struct device *dev = pci->dev;
+	struct fwnode_handle *fw_intc;
 	int ret = 0;
 
-	np_intc = of_get_child_by_name(np, "legacy-interrupt-controller");
-	if (!np_intc) {
-		dev_err(pci->dev, "Failed to get legacy-interrupt-controller node\n");
+	fw_intc = device_get_named_child_node(dev, "legacy-interrupt-controller");
+	if (!fw_intc) {
+		dev_err(dev, "Failed to get legacy-interrupt-controller node\n");
 		return -EINVAL;
 	}
 
-	pp->irq = irq_of_parse_and_map(np_intc, 0);
-	if (!pp->irq) {
-		dev_err(pci->dev, "Failed to get an IRQ entry in legacy-interrupt-controller\n");
-		ret = -EINVAL;
+	pp->irq = fwnode_irq_get(fw_intc, 0);
+	if (pp->irq < 0) {
+		dev_err(dev, "Failed to get an IRQ entry in legacy-interrupt-controller\n");
+		ret = pp->irq;
 		goto out_put_node;
 	}
 
-	pcie->intx_irq_domain = irq_domain_create_linear(of_fwnode_handle(np_intc), PCI_NUM_INTX,
+	pcie->intx_irq_domain = irq_domain_create_linear(fw_intc, PCI_NUM_INTX,
 						&uniphier_intx_domain_ops, pp);
 	if (!pcie->intx_irq_domain) {
-		dev_err(pci->dev, "Failed to get INTx domain\n");
+		dev_err(dev, "Failed to get INTx domain\n");
 		ret = -ENODEV;
 		goto out_put_node;
 	}
@@ -291,7 +290,7 @@ static int uniphier_pcie_config_intx_irq(struct dw_pcie_rp *pp)
 					 pp);
 
 out_put_node:
-	of_node_put(np_intc);
+	fwnode_handle_put(fw_intc);
 	return ret;
 }
 
-- 
2.55.0