[U-Boot] [PATCH 2/4] rockchip: efuse: add (misc) driver for RK3399 non-secure efuse block

[Simon Glass]

On 26 April 2017 at 16:36, Philipp Tomsich
<philipp.tomsich at theobroma-systems.com> wrote:
> This adds a simple driver for reading the efuse block of the RK3399.
> It should be easy enough to add drivers for other devices (e.g. the
> RK3328, RK3368, etc.) by passing the device details via driver_data.
>
> Unlike the kernel driver (using the nvmem subsystem), we don't expose
> the efuse as multiple named cells, but rather as a linear memory that
> can be read using misc_read(...).
>
> The primary use case (as of today) is the generation of a 'serial#'
> (and a 'cpuid#') environment variable for the RK3399-Q7 (Puma)
> system-on-module.
>
> Note that this adds a debug-only (i.e. only if DEBUG is defined)
> command 'rk3399_dump_efuses' that dumps the efuse block's content.
> N.B.: The name 'rk3399_dump_efuses' was intentionally chosen to
>       include a SoC-name (together with a comment in the function) to
>       remind whoever adds support for additional SoCs that this
>       function currently makes assumptions regarding the size of the
>       fuse-box based on the RK3399. The hope is that the function is
>       adjusted to reflect any changes resulting from generalising the
>       driver for multiple SoCs and is then renamed.
>
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Tested-by: Klaus Goger <klaus.goger at theobroma-systems.com>
> ---
>
>  drivers/misc/Kconfig          |  14 ++++
>  drivers/misc/Makefile         |   1 +
>  drivers/misc/rockchip-efuse.c | 163 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 178 insertions(+)
>  create mode 100644 drivers/misc/rockchip-efuse.c

Acked-by: Simon Glass <sjg at chromium.org>