[PATCH v3 2/2] firmware: smccc: provide stubs when discovery is disabled

[Julian Braha <julianbraha@gmail.com>]

Add fallbacks for callers to avoid needing #ifdef guards when
HAVE_ARM_SMCCC_DISCOVERY is disabled (32-bit arm).

Fixes: 35727af2b15d ("irqchip/gicv3: Workaround for NVIDIA erratum T241-FABRIC-4")
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Julian Braha <julianbraha@gmail.com>
---
Changes since v2:
- split out changes into two patches

Link to v2:
https://lore.kernel.org/all/20260823180832.1246363-1-julianbraha@gmail.com/

Changes since v1:
- remove select and dependency on ARM_PSCI_FW,
- make the HAVE_ARM_SMCCC_DISCOVERY 'select' conditional on arm64

Link to v1: https://lore.kernel.org/all/20260801212235.2692694-1-julianbraha@gmail.com/
---
 include/linux/arm-smccc.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
index 4de81848fe2e..75f9d3f1723b 100644
--- a/include/linux/arm-smccc.h
+++ b/include/linux/arm-smccc.h
@@ -324,6 +324,7 @@ enum arm_smccc_conduit {
 	SMCCC_CONDUIT_HVC,
 };
 
+#ifdef CONFIG_HAVE_ARM_SMCCC_DISCOVERY
 /**
  * arm_smccc_1_1_get_conduit()
  *
@@ -363,6 +364,12 @@ s32 arm_smccc_get_soc_id_version(void);
  * When ARM_SMCCC_ARCH_SOC_ID is not present, returns SMCCC_RET_NOT_SUPPORTED.
  */
 s32 arm_smccc_get_soc_id_revision(void);
+#else   /* CONFIG_HAVE_ARM_SMCCC_DISCOVERY */
+#define arm_smccc_1_1_get_conduit()	SMCCC_CONDUIT_NONE
+#define arm_smccc_get_version()		0
+#define arm_smccc_get_soc_id_version()	SMCCC_RET_NOT_SUPPORTED
+#define arm_smccc_get_soc_id_revision()	SMCCC_RET_NOT_SUPPORTED
+#endif	/* CONFIG_HAVE_ARM_SMCCC_DISCOVERY */
 
 #ifndef __ASSEMBLY__
 
-- 
2.55.0