To read pid/cid registers, the probed device need to be properly turned on.
When it is inside a power domain, the bus code should ensure that the
given power domain is enabled before trying to access device's registers.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/amba/bus.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index f009936..25715cb 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -373,6 +373,12 @@ int amba_device_add(struct amba_device *dev, struct resource *parent)
goto err_release;
}
+ ret = dev_pm_domain_attach(&dev->dev, true);
+ if (ret) {
+ iounmap(tmp);
+ goto err_release;
+ }
+
ret = amba_get_enable_pclk(dev);
if (ret == 0) {
u32 pid, cid;
@@ -398,6 +404,7 @@ int amba_device_add(struct amba_device *dev, struct resource *parent)
}
iounmap(tmp);
+ dev_pm_domain_detach(&dev->dev, true);
if (ret)
goto err_release;
--
1.9.2
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