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    Subject[RFC PATCHv2 0/2] Export SoC info through sysfs
    Here is the second version of the proposal to export SoC related information to user-space through sysFS interface.

    The first patch introduces the common part, which provides an interface to the platform to export platform-defined IDs to user-space.
    The IDs strings can be provided in two ways: either with a pointer to the string, or by a callback fullfilling the sysfs's "show" callback buffer.

    The second patch is given as example for the ux500 architecture. It registers the socinfo interface, and exports 5 values (Family name, machine name, silicon process, silicon revision, and serial number).

    Here is the output for DB8500:
    root@ME:/sys/socinfo ls -l
    -r--r--r-- 1 root root 4096 Jan 2 03:35 family
    -r--r--r-- 1 root root 4096 Jan 2 03:35 machine
    -r--r--r-- 1 root root 4096 Jan 2 03:35 process
    -r--r--r-- 1 root root 4096 Jan 2 03:35 revision
    -r--r--r-- 1 root root 4096 Jan 2 03:35 soc_id
    root@ME:/sys/socinfo cat machine
    root@ME:/sys/socinfo cat family
    root@ME:/sys/socinfo cat process
    root@ME:/sys/socinfo cat revision
    root@ME:/sys/socinfo cat soc_id

    Conclusion about first version :
    * /sys/devices/system is not right place for this interface.
    * "mach_name" should be declared as other attributes to simplify code.
    * The get_info callback should use directly the "show" callback buffer.
    * Documentation was missing (ABI description required)
    * Errors were not reported at registration time.
    * Macros should be used to create attributes.
    * Some kernel coding rules not followed.


    Any comments are welcome.

    Note that I will be off from 13th to 21th of March.



    Maxime Coquelin (2):
    Export SoC info through sysfs
    ux500: Export U8500 SoC info through sysfs

    Documentation/ABI/testing/sysfs-socinfo | 16 ++++++
    arch/arm/mach-ux500/Kconfig | 1 +
    arch/arm/mach-ux500/id.c | 70 +++++++++++++++++++++++++++
    drivers/base/Kconfig | 3 +
    drivers/base/Makefile | 1 +
    drivers/base/soc.c | 79 +++++++++++++++++++++++++++++++
    include/linux/sys_soc.h | 50 +++++++++++++++++++
    7 files changed, 220 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-socinfo
    create mode 100644 drivers/base/soc.c
    create mode 100644 include/linux/sys_soc.h

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