[PATCH v2 2/2] [usb] add support for ACPI identification to xhci-platform

[mlangsdo@redhat.com (Mark Langsdorf)]

Provide the methods to let ACPI identify the need to use
xhci-platform. Change the Kconfig files so the
xhci-plat.o file is selectable during kernel config.

Signed-off-by: Mark Langsdorf <mlangsdo@redhat.com>
---
Changes from v1
	Renamed from "add support for APM X-Gene to xhci-platform"
	Removed changes to arm64/Kconfig
	Made CONFIG_USB_XHCI_PLATFORM a user selectable config option

 drivers/usb/host/Kconfig     |  7 ++++++-
 drivers/usb/host/xhci-plat.c | 11 +++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 82800a7..060a2361 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -27,7 +27,12 @@ config USB_XHCI_HCD
 if USB_XHCI_HCD
 
 config USB_XHCI_PLATFORM
-	tristate
+	tristate "xHCI platform driver support"
+	--help--
+	  Say 'Y' to enable the support for the xHCI host controller
+	  as a platform device. Many ARM SoCs provide USB this way.
+
+	  If unsure, say 'Y'.
 
 config USB_XHCI_MVEBU
 	tristate "xHCI support for Marvell Armada 375/38x"
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 91c7557..3db47ea 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -18,6 +18,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/usb/xhci_pdriver.h>
+#include <linux/acpi.h>
 
 #include "xhci.h"
 #include "xhci-mvebu.h"
@@ -287,6 +288,15 @@ static const struct of_device_id usb_xhci_of_match[] = {
 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 #endif
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id usb_xhci_acpi_match[] = {
+	/* APM X-Gene USB Controller */
+	{ "PNP0D10", },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
+#endif
+
 static struct platform_driver usb_xhci_driver = {
 	.probe	= xhci_plat_probe,
 	.remove	= xhci_plat_remove,
@@ -294,6 +304,7 @@ static struct platform_driver usb_xhci_driver = {
 		.name = "xhci-hcd",
 		.pm = DEV_PM_OPS,
 		.of_match_table = of_match_ptr(usb_xhci_of_match),
+		.acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
 	},
 };
 MODULE_ALIAS("platform:xhci-hcd");
-- 
1.9.3