On 12/05/15 23:55, Rob Herring wrote:
On Tue, May 12, 2015 at 12:38 PM, Sudeep Holla <sudeep.holla@xxxxxxx> wrote:
Commit 5590f3196b29 ("drivers/core/of: Add symlink to device-tree from
devices with an OF node") adds the symlink `of_node` for each device
pointing to it's device tree node while creating/initialising it.
However the devicetree sysfs is created and setup in of_init which is
executed at core_initcall level. For all the devices created at the core
initcall before of_init, the following error is thrown:
"Error -2(-ENOENT) creating of_node link"
What devices have you seen the problem with? I'd rather see if those
devices could now be moved later.
Yes that's exactly what I attempted first after seeing the issue, but
failed miserably due to the dependency mentioned below.
It's on vexpress platforms with the following initcall sequence:
1. core - vexpress system control registers block(sysreg)
2. postcore - vexpress configuration controllers(config-bridge)
3. arch - customize_machine->of_platform_populate
of_platform_populate creates amba_devices which need clocks and
depend on the vexpress-config and clocks which in turn depends on
vexpress-sysreg
I would like to know if with commit 5590f3196b29 are we mandating
all the device creation to be done only after core_initcall or
is it OK get the errors mentioned above and ignore them as harmless
as the comment in the code states:
"An error here doesn't warrant bringing down the device"
Since the core_initcall is the earliest point where devices get
registered, push initcall level of of_init from core to pure so that
the devicetree sysfs is ready before any devices are registered.
Read the definition of pure:
* A "pure" initcall has no dependencies on anything else, and purely
* initializes variables that couldn't be statically initialized.
Yes I read and was bit hesitant initially to do this change, but found
no better way. I posted mainly to discuss other possibilities to solve
the issue.
Regards,
Sudeep
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