[PATCH] common: optee: improve documentation of options

[Ahmad Fatoum]

Hi,

On 6/3/25 12:59, Ahmad Fatoum wrote:
> CONFIG_OPTEE_SIZE and CONFIG_OPTEE_SHM_SIZE have a correspondence to OP-TEE
> build config options, so point that out in the help text.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---

v1 -> v2:
  - fix confusion about CFG_SHMEM_SIZE erroneously not being part of
    CONFIG_OPTEE_SIZE

> Cc: Fabian Pflug <fpg at pengutronix.de>
> ---
>  common/Kconfig | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/common/Kconfig b/common/Kconfig
> index fe50da8f3084..987148847eac 100644
> --- a/common/Kconfig
> +++ b/common/Kconfig
> @@ -1304,9 +1304,11 @@ config OPTEE_SIZE
>  	prompt "OP-TEE Memory Size"
>  	depends on HAVE_OPTEE
>  	help
> -	  Size to reserve in main memory for OP-TEE.
> +	  Size to reserve in main memory for OP-TEE, including its shared memory.
>  	  Can be larger than the actual size used by OP-TEE, this is used to prevent
>  	  barebox from using or speculating into this area.
> +	  On i.MX, this should be at least OP-TEE CFG_TZDRAM + CFG_SHMEM_SIZE.
> +	  The name of the CFG_ options may differ on other platforms.
>  
>  config OPTEE_SHM_SIZE
>  	hex
> @@ -1315,7 +1317,11 @@ config OPTEE_SHM_SIZE
>  	depends on HAVE_OPTEE
>  	help
>  	  Size to reserve in main memory for static OP-TEE shared memory
> -	  communication. Can be used for fixing up the OP-TEE OF node.
> +	  communication. The OP-TEE shared memory starts directly after
> +	  the OPTEE TZDRAM region. It should be chosen to be equivalent
> +	  to CFG_SHMEM_SIZE in OP-TEE.
> +
> +	  This value can be used for fixing up the OP-TEE OF node.
>  
>  	  A shared memory size of 0 means that only dynamic shared memory
>  	  will be supported for communication with OP-TEE. This is the only

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