[RFC PATCH 0/4] add sifive reset device

[Anup Patel]

Hi Green Wan,

On Thu, Jul 1, 2021 at 2:31 PM Green Wan <green.wan at sifive.com> wrote:
>
> To enable reset device for SiFive Unmatched board, the patchset starts
> with a preparetory patch [1/4] to unify the file and function names of
> current 'sifive_test' reset device.
>
> Then, adding 'gpio-poweroff' DT parsing and a gpio output interface to
> lib/utils in patch [2/4] and [3/4].
>
> The reset device 'sifive_reset' is added in the last patch [4/4].
>
> 'sifive_reset' device uses gpio_direction_output() to do the reset.
> The entry point for GPIO initialization must be initialized first and
> is placed at patform/generic/platform.c.
>
> Current GPIO interface is simple and only ouput control callback is
> available.
>
> Green Wan (4):
>   lib: utils: reset: unify naming of 'sifive_test' device
>   lib: utils: add GPIO and poweroff parsing
>   lib: utils: add gpio generic interface
>   lib: utils: add sifive reset device

The first patch was trivial so I have merged it.

For remaining three patches, we have following issues:
1) GPL is not compatible with BSD-2-clause so please use
    BSD-2-clause
2) We can have multiple users of GPIO devices so the
    probing of GPIO drivers should be on-demand from
    client driver (such as GPIO based reset driver)
3) If point#2 above is addressed then we will not require
    any GPIO code in generic SBI library (lib/sbi/ directory)

Let me re-factor your patches (of-course preserving your
authorship) and send a v2. You can take-over from v2 series.

The approach we take for GPIO will also serve as guidance
for I2C or SPI based reset.

Regards,
Anup

>
>  include/sbi/sbi_gpio.h                  | 23 ++++++++
>  include/sbi_utils/fdt/fdt_helper.h      | 21 ++++++++
>  include/sbi_utils/gpio/fdt_gpio.h       | 32 +++++++++++
>  include/sbi_utils/sys/sifive_reset.h    | 18 +++++++
>  lib/utils/fdt/fdt_helper.c              | 51 +++++++++++++++++-
>  lib/utils/gpio/fdt_gpio.c               | 55 +++++++++++++++++++
>  lib/utils/gpio/objects.mk               | 11 ++++
>  lib/utils/gpio/sifive_gpio.c            | 70 +++++++++++++++++++++++++
>  lib/utils/reset/fdt_reset.c             |  2 +
>  lib/utils/reset/fdt_reset_sifive.c      | 37 ++++++++-----
>  lib/utils/reset/fdt_reset_sifive_test.c | 36 +++++++++++++
>  lib/utils/reset/objects.mk              |  1 +
>  lib/utils/sys/objects.mk                |  1 +
>  lib/utils/sys/sifive_reset.c            | 66 +++++++++++++++++++++++
>  platform/generic/platform.c             |  3 ++
>  15 files changed, 413 insertions(+), 14 deletions(-)
>  create mode 100644 include/sbi/sbi_gpio.h
>  create mode 100644 include/sbi_utils/gpio/fdt_gpio.h
>  create mode 100644 include/sbi_utils/sys/sifive_reset.h
>  create mode 100644 lib/utils/gpio/fdt_gpio.c
>  create mode 100644 lib/utils/gpio/objects.mk
>  create mode 100644 lib/utils/gpio/sifive_gpio.c
>  create mode 100644 lib/utils/reset/fdt_reset_sifive_test.c
>  create mode 100644 lib/utils/sys/sifive_reset.c
>
> --
> 2.17.1
>
>
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