[PATCH] bus: imx-aipstz: set default value for opacr registers

[Laurentiu Mihalcea]

On 1/23/2026 12:48 AM, Shengjiu Wang wrote:
> The sdma script app_2_mcu needs the permission to access the peripheral
> devices, so need to clear the Supervisor Protect bit of SPBA2, otherwise
> the sdma script can't work.
>
> As the imx-aipstz is a common driver for all apis bus, so set default
> value for all opacr registers, that the peripheral does not require
> supervisor privilege level for accesses.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang at nxp.com>
> ---
>  drivers/bus/imx-aipstz.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)


Hey SJ,


I'd be interested in explaining the situation a bit better in the commit message.

The 2 most important pieces of information are, in my opinion:


1) SDMA2 transactions are set to user-mode in your particular case.

2) Your script doesn't use the peripheral interface (connected directly

to SPBA), which is why the SDMA2-issued transactions are subjected to

AIPSTZ5's security-related checks.


Of course, please feel free to correct me if I got something wrong.


Thanks,

Laurentiu