state: refactor variable type ...

This ports the following barebox commits and adjusts the handling of type
information of state variables in barebox-state:

| commit 7b3d284
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Mon Apr 3 22:51:58 2017 +0200
|
|     state: remove unused variable type
|
|     enum state_variable_type is never used. Remove it.
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

| commit 7126dff
| Author: Daniel Schultz <d.schultz@phytec.de>
| Date:   Fri Nov 3 11:48:26 2017 +0100
|
|     common: state: Add variable_type to state_variable
|
|     Add a pointer in state_variable to the corresponding variable_type array
|     element.
|
|     Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

| commit dc74265
| Author: Daniel Schultz <d.schultz@phytec.de>
| Date:   Fri Nov 3 11:48:27 2017 +0100
|
|     common: state: Add variable type as enum
|
|     The variable_type struct holds a name of its type. Checking the type of
|     a variable with this string needs much resources.
|
|     This patch introduce a enum of the variable type for better type
|     checking.
|
|     Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
[rhi: fixed function parameter alignment in common/state/state_variables.c,
  and submitted those changes as patches for barebox:
  https://www.mail-archive.com/barebox@lists.infradead.org/msg29427.html
  https://www.mail-archive.com/barebox@lists.infradead.org/msg29462.html ]
Signed-off-by: Roland Hieber <rhi@pengutronix.de>

state: make parameter functions more consistent ...

This replaces a dummy version dev_add_param_int() by a dummy version of
dev_add_param_uint32() to make the compiler happy and ports the following
barebox commit:

| commit c5d95eb
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Fri Apr 7 11:57:08 2017 +0200
|
|     param: make parameter functions more consistent
|
|     This patch creates a consitent set of device parameter functions.
|
|     With this we have: dev_add_param_<type><access>
|
|     "type" is one of: int32, uint32, int64, uint64, string, mac, ipv4, enum,
|     bitmask
|     The improvement here is that we now can exactly specify the width of the
|     int type parameters and also correctly distinguish between signed and
|     unsigned variables which means that a variable no longer ends up with
|     INT_MAX when it's assigned -1.
|
|     "access" can be empty for regular read/write parameter, "_ro" for readonly
|     parameters which get their value from a variable pointer in the
|     background or "_fixed" for parameters which are set to a fixed value
|     (without a pointer in the background).
|
|     Some more exotic types are not (yet) implemented, like
|     dev_add_param_ip_ro.
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Roland Hieber <rhi@pengutronix.de>

treewide: Use of_property_write_string() where appropriate ...

This ports the following barebox commit:

| commit b608918
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Thu Mar 30 10:38:19 2017 +0200
|
|     treewide: Use of_property_write_string() where appropriate
|
|     Replace users which use of_set_property() to set a property to a string
|     with of_property_write_string().
|
|     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Roland Hieber <rhi@pengutronix.de>

barebox-state: Sync pieces with barebox ...

dev_add_param_bool are no-ops, save_on_shutdown is irrelevant for the
userspace part. Sync with barebox as of v2017.03.0

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

state: make locally used function static ...

state_set_dirty() is only used in one file, make it static.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

state: consistently pass one type as private data to dev_add_param_* ...

The different dev_add_param_* calls all use different types as private
data. This is unnecessary, use struct state_variable * for all of them.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

state: Add state to state_variable ...

A state variable should know which state it belongs to. Add field
for it to struct state_variable.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

state: Whitespace cleanup ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

barebox-state: Import updated state code ...

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>