[patch V2 32/40] genirq/msi: Provide MSI_FLAG_PARENT_PM_DEV

[Thomas Gleixner]

Some platform-MSI implementations require that power management is
redirected to the underlying interrupt chip device. To make this work
with per device MSI domains provide a new feature flag and let the
core code handle the setup of dev->pm_dev when set during device MSI
domain creation.

Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
---
 include/linux/msi.h |    2 ++
 kernel/irq/msi.c    |    2 ++
 2 files changed, 4 insertions(+)

--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -538,6 +538,8 @@ enum {
 	MSI_FLAG_NOMASK_QUIRK		= (1 << 7),
 	/* Use dev->fwnode for MSI device domain creation */
 	MSI_FLAG_USE_DEV_FWNODE		= (1 << 8),
+	/* Set parent->dev into domain->pm_dev on device domain creation */
+	MSI_FLAG_PARENT_PM_DEV		= (1 << 9),
 
 	/* Mask for the generic functionality */
 	MSI_GENERIC_FLAGS_MASK		= GENMASK(15, 0),
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -884,6 +884,8 @@ static struct irq_domain *__msi_create_i
 		if (!domain->name && info->chip)
 			domain->name = info->chip->name;
 		irq_domain_update_bus_token(domain, info->bus_token);
+		if (info->flags & MSI_FLAG_PARENT_PM_DEV)
+			domain->pm_dev = parent->pm_dev;
 	}
 
 	return domain;