Re: [PATCH] firmware: smccc: default ARM_SMCCC_SOC_ID to disabled

[Satya Durga Srinivasu Prabhala]

Hello Dmitry,

On 1/13/2026 3:25 AM, Dmitry Baryshkov wrote:
> On Mon, Jan 12, 2026 at 10:24:06PM -0800, Satya Durga Srinivasu Prabhala wrote:
> > 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.
> NAK, the userspace should not depend on the exact kernel configuration.
> Consider working with distribution kernels, which would enable this
> driver anyway.
As I mentioned in the other replies, vendor interface exists before the 
standard
interface and user space heavily relies on soc0 already. If not 
disabling the
SMCCC SOC ID by default. I believe, we should  at-least have a way to make
sure vendors can disable SMCCC SOC ID by some means or have vendor
interface takes precedence.

Best,
Satya
> > 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@xxxxxxxxxxxxxxxx>
> > ---
> >   drivers/firmware/smccc/Kconfig | 5 ++++-
> >   1 file changed, 4 insertions(+), 1 deletion(-)