Since most boards now use the same generic device config header, move its
setup to SoC Kconfig instead of setting SYS_CONFIG_NAME in each board's
Kconfig.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Most device headers contain SoC specific part and common Tegra post part.
Add a generic header which can be used by any Tegra device of one of the
supported SoC generations (T20, T30, T114, T124 or T210) without need in
device specific configuration.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Convert CFG_TEGRA_BOARD_STRING into Kconfig option and move it into device
board Kconfig.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Assorted Tegra enhancements. Merged with the recent XPL_BUILD changes,
resolve some whitespace issues and fix the name of the new apalis-tk1
env file by Tom.

Signed-off-by: Tom Rini <trini@konsulko.com>

Use SPL GPIO functions to simplify RCM hook on HTC One X.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Convert boards to use text based env. This is the first stage of
conversion, common inclusions should be converted next.

Acked-by: Francesco Dolcini <francesco.dolcini@toradex.com> # Toradex Apalis TK1
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Use the new symbol to refer to any 'SPL' build, including TPL and VPL

Signed-off-by: Simon Glass <sjg@chromium.org>

Unlike all other supported Tegra devices and most known Tegra devices, the
HTC One X has no hardware way to enter APX/RCM mode, which may lead to a
dangerous situation when, if BCT is set correctly and the bootloader is
faulty, the device will hang in a permanent brick state. Exiting from this
state can be done only by disassembling the device and shortening the
testpad to the ground.

To prevent this or to minimize the probability of such an accident, it was
proposed to add the RCM rebooting hook as early into SPL as possible since
SPL is much more robust and has minimal changes that can break bootflow.

gpio_early_init_uart() function was chosen as it is the earliest function
exposed for setup by the device. Hook performs a check for volume up button
state and triggers RCM if it is pressed.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Drop the pinmux setup in the board in favor of setting it up in
the device tree. Device tree nodes match nodes used for the Linux
device tree and are set according to the downstream kernel. 

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

Since required drivers were merged, we can safely clean up the
board and switch to DM based driver with device tree support.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>