Hello,
On 2015-11-25 14:24, Russell King - ARM Linux wrote:
On Wed, Nov 25, 2015 at 01:58:09PM +0100, Marek Szyprowski wrote:
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.szyprow...@samsung.com>
---
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;
+ }
+
NAK. If dev_pm_domain_attach() returns an error, even -EPROBE_DEFER,
the result will be a missing device that has no way to be recovered.
This is too fragile.
Then how the problem of accessing registers in turned-off device should
be solved?
Is ignoring dev_pm_domain_attach() return value a solution for you?
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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