u-boot/doc/device-tree-bindings/config.txt
Philipp Tomsich ae0d33a729 rockchip: rk3399-puma: add code to allow forcing a power-on reset
The reset circuitry in the RK3399 only resets 'almost all logic' when
a software reset is performed.  To make our software maintenance
easier in the future, we want to have the option (controlled by a DTS
property) to force all reset causes other than a power-on reset to
trigger a power-on reset via a GPIO trigger.

This adds the necessary support to the rk3399-puma (i.e. RK3399-Q7)
board-support and the documentation for the new property
(sysreset-gpio) within the /config-node.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-11-30 22:59:54 +01:00

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The /config node (Configuration Options)
----------------------------------------
A number of run-time configuration options are provided in the /config node
of the control device tree. You can access these using fdtdec_get_config_int(),
fdtdec_get_config_bool() and fdtdec_get_config_string().
Available options are:
silent-console
If present and non-zero, the console is silenced by default on boot.
no-keyboard
Tells U-Boot not to expect an attached keyboard with a VGA console
u-boot,efi-partition-entries-offset
If present, this provides an offset (in bytes, from the start of a
device) that should be skipped over before the partition entries.
This is used by the EFI/GPT partition implementation when a device
is formatted.
This setting will override any values configured via Kconfig.
u-boot,mmc-env-partition
if present, the environment shall be placed at the last
CONFIG_ENV_SIZE blocks of the partition on the
CONFIG_SYS_MMC_ENV_DEV.
if u-boot,mmc-env-offset* is present, this setting will take
precedence. In that case, only if the partition is not found,
mmc-env-offset* will be tried.
u-boot,mmc-env-offset
u-boot,mmc-env-offset-redundant
If present, the values of the 'u-boot,mmc-env-offset' and/or
of the u-boot,mmc-env-offset-redundant' properties overrides
CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND, respectively,
for SD/MMC devices.
Values are interpreted as the offset from the start of the
device, specified in bytes. It is assumed that the setting
will point at the beginning of a LBA and values that are not
LBA-aligned will be rounded up to the next LBA address.
u-boot,spl-payload-offset
If present (and SPL is controlled by the device-tree), this allows
to override the CONFIG_SYS_SPI_U_BOOT_OFFS setting using a value
from the device-tree.
sysreset-gpio
If present (and supported by the specific board), indicates a
GPIO that can be set to trigger a system reset. It is assumed
that such a system reset will effect a complete platform reset,
being roughly equivalent to a power-on reset.