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

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Message-ID: <7ruiccdm7q5fg2pixmszr3fqvclvymdlkv4x4xbavkaeczrxgc@5l6usxqfi5fe>
Date: Tue, 13 Jan 2026 13:25:16 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Satya Durga Srinivasu Prabhala <satya.prabhala@....qualcomm.com>
Cc: Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        trilok.soni@....qualcomm.com
Subject: Re: [PATCH] firmware: smccc: default ARM_SMCCC_SOC_ID to disabled

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.

> 
> 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(-)
> 

-- 
With best wishes
Dmitry