linux-kernel - [PATCH v8 2/3] usb: Add support for ACPI identification to xhci-platform

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Date:	Thu, 17 Sep 2015 11:19:47 -0700
From:	Duc Dang <dhdang@....com>
To:	Greg KH <gregkh@...uxfoundation.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Loc Ho <lho@....com>, Arnd Bergmann <arnd@...db.de>,
	mathias.nyman@...el.com
Cc:	USB list <linux-usb@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Mark Langsdorf <mlangsdo@...hat.com>,
	patches <patches@....com>, Feng Kan <fkan@....com>,
	Duc Dang <dhdang@....com>
Subject: [PATCH v8 2/3] usb: Add support for ACPI identification to xhci-platform

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.

This has been tested on an ARM64 machine with platform XHCI, an
x86_64 machine with XHCI, and an x86_64 machine without XHCI.
There were no regressions or error messages on the machines
without platform XHCI.

[dhdang: regenerate the patch over v4.3-rc1 and address new comments]
Signed-off-by: Mark Langsdorf <mlangsdo@...hat.com>
Signed-off-by: Duc Dang <dhdang@....com>

---
 drivers/usb/host/xhci-plat.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 34c93e8..05647e6 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -19,6 +19,7 @@
 #include <linux/usb/phy.h>
 #include <linux/slab.h>
 #include <linux/usb/xhci_pdriver.h>
+#include <linux/acpi.h>
 
 #include "xhci.h"
 #include "xhci-mvebu.h"
@@ -268,6 +269,13 @@ static const struct of_device_id usb_xhci_of_match[] = {
 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 #endif
 
+static const struct acpi_device_id usb_xhci_acpi_match[] = {
+	/* XHCI-compliant USB Controller */
+	{ "PNP0D10", },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
+
 static struct platform_driver usb_xhci_driver = {
 	.probe	= xhci_plat_probe,
 	.remove	= xhci_plat_remove,
@@ -275,6 +283,7 @@ 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");
-- 
1.9.1

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