[PATCH 3/5] bus: add driver for IMX AIPSTZ bridge

[Mihalcea Laurentiu]

On 24.02.2025 09:55, Marco Felsch wrote:
> Hi Laurentiu,
>
> thanks for your patch.
>
> On 25-02-21, Laurentiu Mihalcea wrote:
>> From: Laurentiu Mihalcea <laurentiu.mihalcea at nxp.com>
>>
>> The secure AHB to IP Slave (AIPSTZ) bus bridge provides access control
>> configurations meant to restrict access to certain peripherals.
>> Some of the configurations include:
>>
>> 	1) Marking masters as trusted for R/W. Based on this
>> 	(and the configuration of the accessed peripheral), the bridge
>> 	may choose to abort the R/W transactions issued by certain
>> 	masters.
> Setting these bits requires very often that the core is running at EL3
> (e.g. secure-monitor) which is not the case for Linux. Can you please
> provide more information how Linux can set these bits?
>
> Regards,
>   Marco


In this particular case, as far as I was able to understand, NS EL1 has enough

privilege to program this IP. This is why Linux can do it.