[PATCH V2] firmware: ti_sci: Scan all device instances when releasing exclusive devices

[Kumar, Udit]

Hi Nishanth,

Sorry for basic question

On 4/7/2025 5:45 PM, Nishanth Menon wrote:
> [..] This creates a problem when Device Manager(DM) firmware starts up later
> on in the boot process and identifies that this instance of i2c is

Do we need to do clean up, where DM is loaded as different binary .

As I understand this cleanup is needed, where DM is running along with 
SPL/R5

or I am missing something


> already marked active, so it assumes this can no longer be controlled
> by software and is marked internally as reserved and HLOS can no
> longer control these instances. This defeated the purpose of
> ti_sci_cmd_release_exclusive_devices.
>
> NOTE: This scheme works just fine if the FIT has just a single dtb as
> the info->dev_list is upto date.
>
> To fix this, let us make ti_sci_cmd_release_exclusive_devices scan the
> all registrations of tisci instances and cleanup all exclusive devices
> that have ever been registered.
>
> As part of this, change the prototype of release_exclusive_devices to
> drop the handle since that has no further meaning now.
>
> Though this issue was identified on AM64-sk, this can be present in
> other builds which use multi-fit-dtb for R5 SPL startup.
>
> [..]