drivers: ele: enable TRUST MU in OP-TEE for i.MX93-EVK/i.MX91-EVK

There is TRUST MU available on i.MX91 and i.MX93 platforms.

TRUST MU can be used to access some HW features of Edgelock Enclave whi

drivers: ele: enable TRUST MU in OP-TEE for i.MX93-EVK/i.MX91-EVK

There is TRUST MU available on i.MX91 and i.MX93 platforms.

TRUST MU can be used to access some HW features of Edgelock Enclave which
Normal MU cannot, but for now it is configured to be used to communicate
with ELE FW.

So Kernel will use Normal MU and OP-TEE will use TRUST MU.

There is special setup needed to write to Trust MU.
* First for TRUST-MU we must write a valid command to TR0 before we can
write any of the remaining registers, and TR15 is reserved for special
USM command.
* The CMD field for TR0 is bits 31:26 and must be greater than
the value of the watermark set in SCM_CR2[31:22]. Typically
if you just set the MSB (bit 31) its enough.
* SIZE must be programmed in bits 19:16 of TR0, we cannot write
TRn past the specified size in this bit field

Signed-off-by: Sahil Malhotra <sahil.malhotra@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: imx_mu: read RX and TX buffer sizes from MU configuation register

On i.MX8ULP, there are multiple MUs with a different number of RX and TX
buffer sizes. To make the driver generic for all M

drivers: imx_mu: read RX and TX buffer sizes from MU configuation register

On i.MX8ULP, there are multiple MUs with a different number of RX and TX
buffer sizes. To make the driver generic for all MUs on this platform, get
the RX and TX buffer size from the MU configuration register.

The configuration remains static for i.MX8Q.

Signed-off-by: Sahil Malhotra <sahil.malhotra@nxp.com>
Signed-off-by: Clement Faure <clement.faure@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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core: driver: add common i.MX MU driver

Add a common MU driver for i.MX platforms. This MU driver is used to
communicate with external security controllers.

This driver includes a generic part and

core: driver: add common i.MX MU driver

Add a common MU driver for i.MX platforms. This MU driver is used to
communicate with external security controllers.

This driver includes a generic part and an hardware abstraction layer
for low level MU functions.

The MU driver implements the HAL for the following platforms:
- mx8ulpevk
- mx8qmmek/imx8qxpmek

Signed-off-by: Clement Faure <clement.faure@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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