We can detect the SDRAM automatically, no need to let the boards
do it manually.
This also fixes device tree based i.MX28 boards like the duckbill.
These boards once had a /memory node in the device tree, but now
that this was changed to /memory@40000000 barebox didn't find it
anymore.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Roland Hieber <r.hieber@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

This replaces the reset_cpu() function which every SoC or board must
provide with registered handlers. This makes it possible to have multiple
reset functions for boards which have multiple ways to reset the machine.
Also boards which have no way at all to reset the machine no longer
have to provide a dummy reset_cpu() function.

The problem this solves is that some machines have external PMICs or
similar to reset the system which have to be preferred over the
internal SoC reset, because the PMIC can reset not only the SoC but also
the external devices.

To pick the right way to reset a machine each handler has a priority. The
default priority is 100 and all currently existing restart handlers are
registered with this priority. of_get_restart_priority() allows to retrieve
the priority from the device tree which makes it possible for boards to
give certain restart handlers a higher priority in order to use this one
instead of the default one.

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

The ocotp device is completely SoC internal, no need to register
it from boards. Register it from SoC code instead.

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

This turns the MXS gpio support into a driver.

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

When a device tree is present the SoC internal devices come from
it, so do not register them as platform devices.

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

And replace the ones needed with the SoC specific header.

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

This converts the apbh driver into a real driver.

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

This adds support for the i.MX23 and i.MX28 clock modules. This mostly is
a copy from the kernel.

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

Since commit:

    2ccd451 ARM i.MX28: change default watchdog reset method

the external reset via the reset pin is broken. That commit overwrites the
HW_CLKCTRL_RESET register with only WDOG_POR_DISABLE set, which results in
disabling the external reset.

This patch uses read-modify-write to set the WDOG_POR_DISABLE, leaving the
WDOG_POR_DISABLE untouched.

Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

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

The default setting for the imx28 watchdog is to do a power-off reset. If the
SoC is only powered via battery, then the watchdog powers the chip down, though.
According to the datasheet it should still be possible to execute a proper POR
with battery power, but testing showed otherwise.
When the watchdog power-off reset is disabled, a software reset is executed
instead. This works with and without battery power.

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

Currently the watchdog is occupied for system reset. This usage collides with
the dedicated usage of a watchdog. This patch change the behaviour of at least
i.MX23/i.MX28 where the chipset supports a simple and powerful alternative
to reset the whole SoC (including the PMIC).

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