nvmem: stm32: add OP-TEE support for STM32MP13x

For boot with OP-TEE on STM32MP13, the communication with the secure
world no more use STMicroelectronics SMC but communication with the
STM32MP BSEC TA, for data access (read/write) or lock operation:
- all the request are sent to OP-TEE trusted application,
- for upper OTP with ECC protection and with word programming only
  each OTP are permanently locked when programmed to avoid ECC error
  on the second write operation

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230206134356.839737-18-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/Kconfig

@@ -290,9 +290,20 @@ config NVMEM_SPRD_EFUSE
 	  This driver can also be built as a module. If so, the module
 	  will be called nvmem-sprd-efuse.
 
+config NVMEM_STM32_BSEC_OPTEE_TA
+	bool "STM32MP BSEC OP-TEE TA support for nvmem-stm32-romem driver"
+	depends on OPTEE
+	help
+	  Say y here to enable the accesses to STM32MP SoC OTPs by the OP-TEE
+	  trusted application STM32MP BSEC.
+
+	  This library is a used by stm32-romem driver or included in the module
+	  called nvmem-stm32-romem.
+
 config NVMEM_STM32_ROMEM
 	tristate "STMicroelectronics STM32 factory-programmed memory support"
 	depends on ARCH_STM32 || COMPILE_TEST
+	imply NVMEM_STM32_BSEC_OPTEE_TA
 	help
 	  Say y here to enable read-only access for STMicroelectronics STM32
 	  factory-programmed memory area.