linux/arch/powerpc/sysdev/qe_lib
Marc Zyngier ad3aedfbb0 genirq/irqdomain: Allow irq domain aliasing
It is not uncommon (at least with the ARM stuff) to have a piece
of hardware that implements different flavours of "interrupts".
A typical example of this is the GICv3 ITS, which implements
standard PCI/MSI support, but also some form of "generic MSI".

So far, the PCI/MSI domain is registered using the ITS device_node,
so that irq_find_host can return it. On the contrary, the raw MSI
domain is not registered with an device_node, making it impossible
to be looked up by another subsystem (obviously, using the same
device_node twice would only result in confusion, as it is not
defined which one irq_find_host would return).

A solution to this is to "type" domains that may be aliasing, and
to be able to lookup an device_node that matches a given type.
For this, we introduce irq_find_matching_host() as a superset
of irq_find_host:

struct irq_domain *irq_find_matching_host(struct device_node *node,
                                enum irq_domain_bus_token bus_token);

where bus_token is the "type" we want to match the domain against
(so far, only DOMAIN_BUS_ANY is defined). This result in some
moderately invasive changes on the PPC side (which is the only
user of the .match method).

This has otherwise no functionnal change.

Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Yijing Wang <wangyijing@huawei.com>
Cc: Ma Jun <majun258@huawei.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Duc Dang <dhdang@apm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1438091186-10244-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-07-30 00:14:36 +02:00
..
Kconfig powerpc/qe: Fix Kconfig enablement of QE_USB support 2013-03-15 11:14:15 -05:00
Makefile powerpc/QE: implement support for the GPIO LIB API 2008-06-10 11:11:10 -05:00
gpio.c gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags() 2011-12-12 13:40:16 -07:00
qe.c powerpc/qe: Use strlcpy() 2015-01-29 23:32:13 -06:00
qe_ic.c genirq/irqdomain: Allow irq domain aliasing 2015-07-30 00:14:36 +02:00
qe_ic.h powerpc: Fix typos in Freescale copyright claims 2012-11-15 13:00:58 +11:00
qe_io.c powerpc: don't export static symbol 2015-03-31 22:23:18 -05:00
ucc.c powerpc: Delete non-required instances of include <linux/init.h> 2014-01-15 13:46:44 +11:00
ucc_fast.c powerpc: Delete non-required instances of include <linux/init.h> 2014-01-15 13:46:44 +11:00
ucc_slow.c powerpc/qe: drop unused ucc_slow_poll_transmitter_now 2015-03-16 18:50:17 +11:00
usb.c powerpc: Fix typos in Freescale copyright claims 2012-11-15 13:00:58 +11:00