PCI: microchip: Enable building driver as a module

Enable building driver as a module. The expected use case is the
driver is built as a module, is installed when needed, and cannot be
removed once installed since it is not possible to clean-up
the irq_chip data structures on removal, as described in:

https://lore.kernel.org/linux-pci/87y1wgbah8.wl-maz@kernel.org/

The driver has .suppress_bind_attrs set to true for the same
reasons (ie prevent unbinding, that would leave the kernel
with stale IRQ configuration that cannot be cleaned up).

Link: https://lore.kernel.org/linux-pci/87y1wgbah8.wl-maz@kernel.org/
Link: https://lore.kernel.org/r/20230728131401.1615724-3-daire.mcnamara@microchip.com
Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 8d49bad..f4ad0e9 100644 (file)
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -217,7 +217,7 @@ config PCIE_MT7621
          This selects a driver for the MediaTek MT7621 PCIe Controller.
 
 config PCIE_MICROCHIP_HOST
-       bool "Microchip AXI PCIe controller"
+       tristate "Microchip AXI PCIe controller"
        depends on PCI_MSI && OF
        select PCI_HOST_COMMON
        help

diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c
index dd52459..5c89caa 100644 (file)
--- a/drivers/pci/controller/pcie-microchip-host.c
+++ b/drivers/pci/controller/pcie-microchip-host.c
@@ -1135,5 +1135,6 @@ static struct platform_driver mc_pcie_driver = {
 };
 
 builtin_platform_driver(mc_pcie_driver);
+MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Microchip PCIe host controller driver");
 MODULE_AUTHOR("Daire McNamara <daire.mcnamara@microchip.com>");