UPSTREAM: Convert CONFIG_SPI to Kconfig

This converts the following to Kconfig:
CONFIG_SPI

This partly involves updating code that assumes that CONFIG_SPI implies
things that are specific to the

UPSTREAM: Convert CONFIG_SPI to Kconfig

This converts the following to Kconfig:
CONFIG_SPI

This partly involves updating code that assumes that CONFIG_SPI implies
things that are specific to the MPC8xx SPI driver. For now, just update
the CONFIG tests. This also involves reworking the default for
CONFIG_SYS_DEF_EEPROM_ADDR so that we don't set it when we cannot make a
reasonable default, as it does not cause any compile failures.

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
(cherry picked from commit f1b1f77060beadbfe9f42a3be00019bd025afbd6)
Change-Id: Ie9f15ada869105eb407f41d4df7eecbaa916b940
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

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treewide: replace with error() with pr_err()

U-Boot widely uses error() as a bit noisier variant of printf().

This macro causes name conflict with the following line in
include/linux/compiler-gcc.h

treewide: replace with error() with pr_err()

U-Boot widely uses error() as a bit noisier variant of printf().

This macro causes name conflict with the following line in
include/linux/compiler-gcc.h:

# define __compiletime_error(message) __attribute__((error(message)))

This prevents us from using __compiletime_error(), and makes it
difficult to fully sync BUILD_BUG macros with Linux. (Notice
Linux's BUILD_BUG_ON_MSG is implemented by using compiletime_assert().)

Let's convert error() into now treewide-available pr_err().

Done with the help of Coccinelle, excluing tools/ directory.

The semantic patch I used is as follows:

// <smpl>
@@@@
-error
+pr_err
(...)
// </smpl>

Change-Id: I921807c1770d36a91e692c48ab477558bb2ed0b8
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[trini: Re-run Coccinelle]
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit 9b643e312d528f291966c1f30b0d90bf3b1d43dc)

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UPSTREAM: dm: core: Add ofnode_for_each_subnode()

Add a convenience macro to iterate over subnodes of a node. Make use of
this where appropriate in the code.

Change-Id: Iae0fb554472d0b5819d26becbbc

UPSTREAM: dm: core: Add ofnode_for_each_subnode()

Add a convenience macro to iterate over subnodes of a node. Make use of
this where appropriate in the code.

Change-Id: Iae0fb554472d0b5819d26becbbcf8909ff891514
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
(cherry picked from commit 3991f42ed2e38aff28ba3c24369bfbd90620bea7)

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