Replace the open-coded of_address_to_resource() plus devm_ioremap_resource() sequence with devm_platform_get_and_ioremap_resource(), which looks up the resource and maps it in one call. The helper returns a pointer to the resource, so update rsrc_start / rsrc_len to dereference it, assign the mapped address to hcd->regs, and use a separate on-stack resource (ohci_res) for the unrelated ibm,usb-ohci-440epx erratum lookup rather than aliasing the returned resource pointer. Switch IRQ acquisition from irq_of_parse_and_map() to platform_get_irq(), which only retrieves the interrupt the OF/platform core has already set up rather than transferring mapping ownership to the driver. Drop the now unneeded irq_dispose_mapping() calls (probe error path and ehci_hcd_ppc_of_remove()) and the now-unused of_irq.h and of_platform.h includes, keeping linux/of_address.h for the erratum block's of_address_to_resource(). Behaviorally equivalent with respect to region reservation: the prior code used devm_ioremap_resource(), which already reserved the region. Built for PowerPC (ppc44x_defconfig + CONFIG_USB_EHCI_HCD_PPC_OF) with LLVM=1; drivers/usb/host/ehci-hcd.o (which includes ehci-ppc-of.c) compiles cleanly. Assisted-by: opencode:hy3-free Signed-off-by: Rosen Penev <rosenp@gmail.com> Link: https://patch.msgid.link/20260713231302.1076740-1-rosenp@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>