linux-kernel - [PATCH] firmware: smccc: default ARM_SMCCC_SOC

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Message-Id: <20260112-disable_smccc_soc_id-v1-1-a5bee24befb4@oss.qualcomm.com>
Date: Mon, 12 Jan 2026 22:24:06 -0800
From: Satya Durga Srinivasu Prabhala <satya.prabhala@....qualcomm.com>
To: Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>
Cc: linux-arm-msm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, satya.prabhala@....qualcomm.com,
        trilok.soni@....qualcomm.com
Subject: [PATCH] firmware: smccc: default ARM_SMCCC_SOC_ID to disabled

The ARM SMCCC SoC ID driver is currently enabled by default and publishes
SMCCC-provided SoC identification into /sys/bus/soc/devices/socX/*.

On platforms where a vendor SoC driver already exposes widely-consumed
attributes (e.g. Qualcomm socinfo [1]), enabling the SMCCC driver changes
the format of /sys/devices/soc0/soc_id (e.g. "jep106:XXYY:ZZZZ" instead
of a vendor logical ID like "519") and breaks existing userspace consumers.

Flip the default of CONFIG_ARM_SMCCC_SOC_ID from y to n. Platforms that
prefer SMCCC over a vendor driver can explicitly enable it.

This avoids unexpected format changes and keeps the generic SoC sysfs
stable on systems that rely on vendor-specific identification.

[1]
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/soc/qcom/socinfo.c

Signed-off-by: Satya Durga Srinivasu Prabhala <satya.prabhala@....qualcomm.com>
---
 drivers/firmware/smccc/Kconfig | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/smccc/Kconfig b/drivers/firmware/smccc/Kconfig
index 15e7466179a6..f830d11ebdca 100644
--- a/drivers/firmware/smccc/Kconfig
+++ b/drivers/firmware/smccc/Kconfig
@@ -18,8 +18,11 @@ config HAVE_ARM_SMCCC_DISCOVERY
 config ARM_SMCCC_SOC_ID
 	bool "SoC bus device for the ARM SMCCC SOC_ID"
 	depends on HAVE_ARM_SMCCC_DISCOVERY
-	default y
+	default n
 	select SOC_BUS
 	help
 	  Include support for the SoC bus on the ARM SMCCC firmware based
 	  platforms providing some sysfs information about the SoC variant.
+	  Note: Several vendor platforms provide their own SoC information
+	  drivers under drivers/soc/*. To avoid conflicting sysfs attribute
+	  formats in /sys/devices/socX/*, this driver defaults to disabled.

---
base-commit: b71e635feefc852405b14620a7fc58c4c80c0f73
change-id: 20260112-disable_smccc_soc_id-ed09ef4d777f

Best regards,
-- 
Satya Durga Srinivasu Prabhala <satya.prabhala@....qualcomm.com>