[PATCH v5 08/19] platform: of: Assign MSI domain to platform device

Marc Zyngier
2015-07-23T09:31:02Z

As for PCI, we're able to populate the msi_domain field at probe time,
provided that the device tree has an "msi-parent" property.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
drivers/of/irq.c | 21 +++++++++++++++++++++
drivers/of/platform.c | 1 +
include/linux/irqdomain.h | 1 +
include/linux/of_irq.h | 1 +
4 files changed, 24 insertions(+)

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 3cf7a01..2956d72 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -18,6 +18,7 @@
* driver.
*/

+#include <linux/device.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/module.h>
@@ -576,3 +577,23 @@ err:
kfree(desc);
}
}
+
+/**
+ * of_msi_configure - Set the msi_domain field of a device
+ * @dev: device structure to associate with an MSI irq domain
+ * @np: device node for that device
+ */
+void of_msi_configure(struct device *dev, struct device_node *np)
+{
+ struct device_node *msi_np;
+ struct irq_domain *d;
+
+ msi_np = of_parse_phandle(np, "msi-parent", 0);
+ if (!msi_np)
+ return;
+
+ d = irq_find_matching_host(msi_np, DOMAIN_BUS_PLATFORM_MSI);
+ if (!d)
+ d = irq_find_host(msi_np);
+ dev_set_msi_domain(dev, d);
+}
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index ddf8e42..8a002d6 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -184,6 +184,7 @@ static struct platform_device *of_platform_device_create_pdata(
dev->dev.bus = &platform_bus_type;
dev->dev.platform_data = platform_data;
of_dma_configure(&dev->dev, dev->dev.of_node);
+ of_msi_configure(&dev->dev, dev->dev.of_node);

if (of_device_add(dev) != 0) {
of_dma_deconfigure(&dev->dev);
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 25e9e66..b4a74f7 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -55,6 +55,7 @@ struct irq_data;
enum irq_domain_bus_token {
DOMAIN_BUS_ANY = 0,
DOMAIN_BUS_PCI_MSI,
+ DOMAIN_BUS_PLATFORM_MSI,
};

/**
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index d884929..4bcbd58 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -74,6 +74,7 @@ static inline int of_irq_to_resource_table(struct device_node *dev,
*/
extern unsigned int irq_of_parse_and_map(struct device_node *node, int index);
extern struct device_node *of_irq_find_parent(struct device_node *child);
+extern void of_msi_configure(struct device *dev, struct device_node *np);

#else /* !CONFIG_OF */
static inline unsigned int irq_of_parse_and_map(struct device_node *dev,
--
2.1.4