[PATCH v3 2/2] coco: guest: arm64: Drop dummy RSI platform device stub

[Aneesh Kumar K.V (Arm)]

The SMCCC firmware driver now creates the `arm-smccc` platform device
and also creates the CCA auxiliary devices once the RSI ABI is
discovered. This makes the arch-specific arm64_create_dummy_rsi_dev()
helper redundant. Remove the arm-cca-dev platform device registration
and let the SMCCC probe manage the RSI device.

systemd match on platform:arm-cca-dev for confidential vm detection [1].
Losing the platform device registration can break that. Keeping this
removal in its own change makes it easy to revert if that regression
blocks the rollout.

[1] https://lore.kernel.org/all/4a7d84b2-2ec4-4773-a2d5-7b63d5c683cf@arm.com

Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Lorenzo Pieralisi <lpieralisi at kernel.org>
Cc: Jeremy Linton <jeremy.linton at arm.com>
Cc: Greg KH <gregkh at linuxfoundation.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Lorenzo Pieralisi <lpieralisi at kernel.org>
Cc: Sudeep Holla <sudeep.holla at arm.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron at huawei.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar at kernel.org>
---
 arch/arm64/kernel/rsi.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c
index 5d711942e543..1b716d18b80e 100644
--- a/arch/arm64/kernel/rsi.c
+++ b/arch/arm64/kernel/rsi.c
@@ -158,18 +158,3 @@ void __init arm64_rsi_init(void)
 
 	static_branch_enable(&rsi_present);
 }
-
-static struct platform_device rsi_dev = {
-	.name = "arm-cca-dev",
-	.id = PLATFORM_DEVID_NONE
-};
-
-static int __init arm64_create_dummy_rsi_dev(void)
-{
-	if (is_realm_world() &&
-	    platform_device_register(&rsi_dev))
-		pr_err("failed to register rsi platform device\n");
-	return 0;
-}
-
-arch_initcall(arm64_create_dummy_rsi_dev)
-- 
2.43.0