Late versions of OP-TEE support a pseudo bus. TAs that behave as hardware blocks (e.g TPM, RNG etc) present themselves on a bus which we can scan. Unfortunately U-Boot doesn't support that yet. It's worth noting that we already have a workaround for RNG. The details are in commit 70812bb83da6 ("tee: optee: bind rng optee driver")
So let's add a list of devices based on U-Boot Kconfig options that we will scan until we properly implement the tee-bus functionality.
While at it change the behaviour of the tee core itself wrt to device binding. If some device binding fails, print a warning instead of disabling OP-TEE.
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- Changes since v1: - remove a macro and use ARRAY_SIZE directly - print a warning instead of disabling op-tee if a driver binding fails
drivers/tee/optee/core.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index a89d62aaf0b3..3cc92f09d299 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -31,6 +31,18 @@ struct optee_pdata { optee_invoke_fn *invoke_fn; };
+static const struct { + const char *drv_name; + const char *dev_name; +} optee_bus_probe[] = { +#ifdef CONFIG_RNG_OPTEE + { "optee-rng", "optee-rng" }, +#endif +#ifdef CONFIG_TPM2_FTPM_TEE + { "ftpm-tee", "ftpm-tee" }, +#endif +}; + struct rpc_param { u32 a0; u32 a1; @@ -643,7 +655,7 @@ static int optee_probe(struct udevice *dev) struct optee_pdata *pdata = dev_get_plat(dev); u32 sec_caps; struct udevice *child; - int ret; + int ret, i;
if (!is_optee_api(pdata->invoke_fn)) { dev_err(dev, "OP-TEE api uid mismatch\n"); @@ -672,10 +684,13 @@ static int optee_probe(struct udevice *dev) * in U-Boot, the discovery of TA on the TEE bus is not supported: * only bind the drivers associated to the supported OP-TEE TA */ - if (IS_ENABLED(CONFIG_RNG_OPTEE)) { - ret = device_bind_driver(dev, "optee-rng", "optee-rng", &child); + + for (i = 0; i < ARRAY_SIZE(optee_bus_probe); i++) { + ret = device_bind_driver(dev, optee_bus_probe[i].drv_name, + optee_bus_probe[i].dev_name, &child); if (ret) - return ret; + dev_warn(dev, "Failed to bind device %s\n", + optee_bus_probe[i].dev_name); }
return 0;