PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/host.h b/drivers/usb/chipidea/host.h
new file mode 100644
index 000000000..2625aa01a
--- /dev/null
+++ b/drivers/usb/chipidea/host.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __DRIVERS_USB_CHIPIDEA_HOST_H
+#define __DRIVERS_USB_CHIPIDEA_HOST_H
+
+#ifdef CONFIG_USB_CHIPIDEA_HOST
+
+int ci_hdrc_host_init(struct ci_hdrc *ci);
+void ci_hdrc_host_destroy(struct ci_hdrc *ci);
+void ci_hdrc_host_driver_init(void);
+
+#else
+
+static inline int ci_hdrc_host_init(struct ci_hdrc *ci)
+{
+	return -ENXIO;
+}
+
+static inline void ci_hdrc_host_destroy(struct ci_hdrc *ci)
+{
+
+}
+
+static inline void ci_hdrc_host_driver_init(void)
+{
+
+}
+
+#endif
+
+#endif /* __DRIVERS_USB_CHIPIDEA_HOST_H */