Re: [PATCH v2 18/18] ARM: i.MX8M: fix optee of-fixup logic

[Sascha Hauer <sha@pengutronix.de>]

On Tue, Jan 16, 2024 at 06:07:38PM +0100, Marco Felsch wrote:
> The current code checks only if "/firmware/optee" exist on the builtin
> dtb and applys the fixup if not found and if found nothing is done. If a
> builtin dts contains the node but an external don't the fixup won't be
> applied. Also if the external dts does have a node + the reserved memory
> region nodes but the barebox builtin dts don't we do add additional
> reserved memory nodes which may conflict due to different name scheme:
> <name> vs. <name>@<addr>.
> 
> Move the "/firmware/optee" check into the of_optee_fixup() so the check
> is done on the correct dtb root nodes.
> 
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> ---
>  arch/arm/mach-imx/imx8m.c    | 3 +--
>  drivers/tee/optee/of_fixup.c | 6 +++++-
>  2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/imx8m.c b/arch/arm/mach-imx/imx8m.c
> index 6db16f024148..73b420b38697 100644
> --- a/arch/arm/mach-imx/imx8m.c
> +++ b/arch/arm/mach-imx/imx8m.c
> @@ -68,8 +68,7 @@ static int imx8m_init(const char *cputypestr)
>  	imx_set_reset_reason(src + IMX7_SRC_SRSR, imx7_reset_reasons);
>  	pr_info("%s unique ID: %llx\n", cputypestr, imx8m_uid());
>  
> -	if (IS_ENABLED(CONFIG_PBL_OPTEE) && tzc380_is_enabled() &&
> -	    !of_find_node_by_path_from(NULL, "/firmware/optee")) {
> +	if (IS_ENABLED(CONFIG_PBL_OPTEE) && tzc380_is_enabled()) {
>  		static struct of_optee_fixup_data optee_fixup_data = {
>  			.shm_size = OPTEE_SHM_SIZE,
>  			.method = "smc",
> diff --git a/drivers/tee/optee/of_fixup.c b/drivers/tee/optee/of_fixup.c
> index cdf650592e90..2ff1f01964c8 100644
> --- a/drivers/tee/optee/of_fixup.c
> +++ b/drivers/tee/optee/of_fixup.c
> @@ -9,12 +9,16 @@
>  int of_optee_fixup(struct device_node *root, void *_data)
>  {
>  	struct of_optee_fixup_data *fixup_data = _data;
> +	const char *optee_of_path = "/firmware/optee";
>  	struct resource res = {};
>  	struct device_node *node;
>  	u64 optee_membase;
>  	int ret;
>  
> -	node = of_create_node(root, "/firmware/optee");
> +	if (of_find_node_by_path_from(NULL, optee_of_path))
> +		return 0;

This implements a "when the internal dts does have a OP-TEE node, then
do not fixup the external dts". This is surely not what you meant. Should
this be

	if (of_find_node_by_path_from(root, optee_of_path))
		return 0;

or something else?

Sascha

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