linux-kernel - [PATCH 13/15] USB: ehci: make orion and mxc bus glues coexist

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Date:	Mon, 21 Jan 2013 17:16:06 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, arm@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org,
	Manjunath Goudar <manjunath.goudar@...aro.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...e-electrons.com>
Subject: [PATCH 13/15] USB: ehci: make orion and mxc bus glues coexist

In linux-3.8-rc1 it became possible to build the imx and
mvebu platforms together in a single kernel, which clashes
in the ehci driver.

Manjunath Goudar is already working on a patch to convert
both the imx and the mvebu glue drivers (along with all
the other ARM specific ones) to the new probing method,
but that will be too late to fix v3.8. This patch instead
adds yet another hack like the existing ones to allow
the ehci driver to load both back-ends.

Without this patch, building allyesconfig results in:

drivers/usb/host/ehci-hcd.c:1285:0: error: "PLATFORM_DRIVER" redefined
drivers/usb/host/ehci-hcd.c:1255:0: note: this is the location of the previous definition
In file included from drivers/usb/host/ehci-hcd.c:1254:0:
drivers/usb/host/ehci-mxc.c:280:31: warning: 'ehci_mxc_driver' defined but not used

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Cc: Manjunath Goudar <manjunath.goudar@...aro.org>
Cc: Shawn Guo <shawn.guo@...aro.org>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Gregory Clement <gregory.clement@...e-electrons.com>
---
 drivers/usb/host/ehci-hcd.c |   16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index c97503b..92e7180 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1282,7 +1282,7 @@ MODULE_LICENSE ("GPL");
 
 #ifdef CONFIG_PLAT_ORION
 #include "ehci-orion.c"
-#define	PLATFORM_DRIVER		ehci_orion_driver
+#define	ORION_PLATFORM_DRIVER		ehci_orion_driver
 #endif
 
 #ifdef CONFIG_USB_W90X900_EHCI
@@ -1353,6 +1353,7 @@ MODULE_LICENSE ("GPL");
 #if !IS_ENABLED(CONFIG_USB_EHCI_PCI) && \
 	!IS_ENABLED(CONFIG_USB_EHCI_HCD_PLATFORM) && \
 	!defined(CONFIG_USB_CHIPIDEA_HOST) && \
+	!defined(ORION_PLATFORM_DRIVER) && \
 	!defined(PLATFORM_DRIVER) && \
 	!defined(PS3_SYSTEM_BUS_DRIVER) && \
 	!defined(OF_PLATFORM_DRIVER) && \
@@ -1393,6 +1394,12 @@ static int __init ehci_hcd_init(void)
 		goto clean0;
 #endif
 
+#ifdef ORION_PLATFORM_DRIVER
+	retval = platform_driver_register(&ORION_PLATFORM_DRIVER);
+	if (retval < 0)
+		goto clean1;
+#endif
+
 #ifdef PS3_SYSTEM_BUS_DRIVER
 	retval = ps3_ehci_driver_register(&PS3_SYSTEM_BUS_DRIVER);
 	if (retval < 0)
@@ -1424,6 +1431,10 @@ clean3:
 	ps3_ehci_driver_unregister(&PS3_SYSTEM_BUS_DRIVER);
 clean2:
 #endif
+#ifdef ORION_PLATFORM_DRIVER
+	platform_driver_unregister(&ORION_PLATFORM_DRIVER);
+clean1:
+#endif
 #ifdef PLATFORM_DRIVER
 	platform_driver_unregister(&PLATFORM_DRIVER);
 clean0:
@@ -1446,6 +1457,9 @@ static void __exit ehci_hcd_cleanup(void)
 #ifdef OF_PLATFORM_DRIVER
 	platform_driver_unregister(&OF_PLATFORM_DRIVER);
 #endif
+#ifdef ORION_PLATFORM_DRIVER
+	platform_driver_unregister(&ORION_PLATFORM_DRIVER);
+#endif
 #ifdef PLATFORM_DRIVER
 	platform_driver_unregister(&PLATFORM_DRIVER);
 #endif
-- 
1.7.10.4

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