[PATCH] spi: let SPI masters ignore their children for PM

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

Let all SPI masters ignore their children: when it comes
to power management: SPI children have no business doing
keeping their parents awake: they are completely autonomous
devices that just use their parent to talk, and the latter
usecase must be power managed by the host itself on a
per-message basis.

Cc: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxx>
Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>
Cc: linux-pm@xxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v1->v2:
- Change subject from
  "let SPI masters inherit suspend child ignorance"
  to
  "let SPI masters ignore their PM children"
-  Use the big hammer and do the sensible thing:
   mark all SPI masters as ignoring their children
   when it comes to power management.
---
 drivers/spi/spi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index de2f2f90d799..6c4c050e6b65 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1764,6 +1764,7 @@ struct spi_master *spi_alloc_master(struct device *dev, unsigned size)
 	master->num_chipselect = 1;
 	master->dev.class = &spi_master_class;
 	master->dev.parent = dev;
+	pm_suspend_ignore_children(&master->dev, true);
 	spi_master_set_devdata(master, &master[1]);
 
 	return master;
-- 
2.4.3

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