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irqchip/gic-v3: Ignore disabled ITS nodes

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On some platforms there's an ITS available but it's not enabled
because reading or writing the registers is denied by the
firmware. In fact, reading or writing them will cause the system
to reset. We could remove the node from DT in such a case, but
it's better to skip nodes that are marked as "disabled" in DT so
that we can describe the hardware that exists and use the status
property to indicate how the firmware has configured things.

Cc: Stuart Yoder <stuyoder@gmail.com>
Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Stephen Boyd 2018-02-01 09:03:29 -08:00 committed by Marc Zyngier
parent 21ec30c0ef
commit 95a2562590
4 changed files with 8 additions and 0 deletions
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2
drivers/irqchip/irq-gic-v3-its-pci-msi.c
View File

@ -132,6 +132,8 @@ static int __init its_pci_of_msi_init(void)
for (np = of_find_matching_node(NULL, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_device_is_available(np))
continue;
if (!of_property_read_bool(np, "msi-controller"))
continue;

2
drivers/irqchip/irq-gic-v3-its-platform-msi.c
View File

@ -154,6 +154,8 @@ static void __init its_pmsi_of_init(void)
for (np = of_find_matching_node(NULL, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_device_is_available(np))
continue;
if (!of_property_read_bool(np, "msi-controller"))
continue;

2
drivers/irqchip/irq-gic-v3-its.c
View File

@ -3314,6 +3314,8 @@ static int __init its_of_probe(struct device_node *node)
for (np = of_find_matching_node(node, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_device_is_available(np))
continue;
if (!of_property_read_bool(np, "msi-controller")) {
pr_warn("%pOF: no msi-controller property, ITS ignored\n",
np);

2
drivers/staging/fsl-mc/bus/irq-gic-v3-its-fsl-mc-msi.c
View File

@ -73,6 +73,8 @@ static int __init its_fsl_mc_msi_init(void)
for (np = of_find_matching_node(NULL, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_device_is_available(np))
continue;
if (!of_property_read_bool(np, "msi-controller"))
continue;