PCI: controller: Use dev_fwnode() instead of of_fwnode_handle()

All irq_domain functions now accept fwnode instead of of_node. But many
PCI controllers still extract dev to of_node and then of_node to fwnode.

Instead, clean this up and simply use the dev_fwnode() helper to extract
fwnode directly from dev. Internally, it still does dev => of_node =>
fwnode steps, but it's now hidden from the users.

In the case of altera, this also removes an unused 'node' variable that is
only used when CONFIG_OF is enabled:

drivers/pci/controller/pcie-altera.c: In function 'altera_pcie_init_irq_domain':
drivers/pci/controller/pcie-altera.c:855:29: error: unused variable 'node' [-Werror=unused-variable]
855 | struct device_node *node = dev->of_node;

Signed-off-by: Jiri Slaby (SUSE) <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]> # altera
[bhelgaas: squash together, rebase to precede msi-parent]
Signed-off-by: Bjorn Helgaas <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Link: https://patch.msgid.link/[e-mail]
Link: https://patch.msgid.link/[e-mail]

drivers/pci/controller/dwc/pcie-designware-host.c

···
 int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
 {
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
-	struct fwnode_handle *fwnode = of_fwnode_handle(pci->dev->of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(pci->dev);
 
 	pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
 					       &dw_pcie_msi_domain_ops, pp);

drivers/pci/controller/mobiveil/pcie-mobiveil-host.c

···
 static int mobiveil_allocate_msi_domains(struct mobiveil_pcie *pcie)
 {
 	struct device *dev = &pcie->pdev->dev;
-	struct fwnode_handle *fwnode = of_fwnode_handle(dev->of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct mobiveil_msi *msi = &pcie->rp.msi;
 
 	mutex_init(&msi->lock);
···
 	struct mobiveil_root_port *rp = &pcie->rp;
 
 	/* setup INTx */
-	rp->intx_domain = irq_domain_create_linear(of_fwnode_handle(dev->of_node), PCI_NUM_INTX,
-						   &intx_domain_ops, pcie);
-
+	rp->intx_domain = irq_domain_create_linear(dev_fwnode(dev), PCI_NUM_INTX, &intx_domain_ops,
+						   pcie);
 	if (!rp->intx_domain) {
 		dev_err(dev, "Failed to get a INTx IRQ domain\n");
 		return -ENOMEM;

drivers/pci/controller/pcie-altera-msi.c

···
 
 static int altera_allocate_domains(struct altera_msi *msi)
 {
-	struct fwnode_handle *fwnode = of_fwnode_handle(msi->pdev->dev.of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(&msi->pdev->dev);
 
 	msi->inner_domain = irq_domain_create_linear(NULL, msi->num_of_vectors,
 					     &msi_domain_ops, msi);

drivers/pci/controller/pcie-altera.c

···
 static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
 {
 	struct device *dev = &pcie->pdev->dev;
-	struct device_node *node = dev->of_node;
 
 	/* Setup INTx */
-	pcie->irq_domain = irq_domain_create_linear(of_fwnode_handle(node), PCI_NUM_INTX,
+	pcie->irq_domain = irq_domain_create_linear(dev_fwnode(dev), PCI_NUM_INTX,
 					&intx_domain_ops, pcie);
 	if (!pcie->irq_domain) {
 		dev_err(dev, "Failed to get a INTx IRQ domain\n");

drivers/pci/controller/pcie-mediatek-gen3.c

···
 	/* Setup MSI */
 	mutex_init(&pcie->lock);
 
-	pcie->msi_bottom_domain = irq_domain_create_linear(of_fwnode_handle(node),
-							   PCIE_MSI_IRQS_NUM,
+	pcie->msi_bottom_domain = irq_domain_create_linear(dev_fwnode(dev), PCIE_MSI_IRQS_NUM,
 							   &mtk_msi_bottom_domain_ops, pcie);
 	if (!pcie->msi_bottom_domain) {
 		dev_err(dev, "failed to create MSI bottom domain\n");

drivers/pci/controller/pcie-mediatek.c

···
 
 static int mtk_pcie_allocate_msi_domains(struct mtk_pcie_port *port)
 {
-	struct fwnode_handle *fwnode = of_fwnode_handle(port->pcie->dev->of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(port->pcie->dev);
 
 	mutex_init(&port->lock);
 

drivers/pci/controller/pcie-xilinx-dma-pl.c

···
 	struct device *dev = port->dev;
 	struct xilinx_msi *msi = &port->msi;
 	int size = BITS_TO_LONGS(XILINX_NUM_MSI_IRQS) * sizeof(long);
-	struct fwnode_handle *fwnode = of_fwnode_handle(port->dev->of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(port->dev);
 
 	msi->dev_domain = irq_domain_create_linear(NULL, XILINX_NUM_MSI_IRQS,
 						   &dev_msi_domain_ops, port);

drivers/pci/controller/pcie-xilinx-nwl.c

···
 {
 #ifdef CONFIG_PCI_MSI
 	struct device *dev = pcie->dev;
-	struct fwnode_handle *fwnode = of_fwnode_handle(dev->of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct nwl_msi *msi = &pcie->msi;
 
 	msi->dev_domain = irq_domain_create_linear(NULL, INT_PCI_MSI_NR, &dev_msi_domain_ops, pcie);

drivers/pci/controller/plda/pcie-plda-host.c

···
 static int plda_allocate_msi_domains(struct plda_pcie_rp *port)
 {
 	struct device *dev = port->dev;
-	struct fwnode_handle *fwnode = of_fwnode_handle(dev->of_node);
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	struct plda_msi *msi = &port->msi;
 
 	mutex_init(&port->msi.lock);