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SoCs like the i.MX6 have their BootROM consult two distinct 32-bit
registers to determine the reboot mode. Extend the driver to support
this. While backwards compatible, this is not so far supported by the
upstream binding, which is why a new barebox,syscon-reboot-mode is
introduced. This new compatible be inhibit used to inhibit fixup
into a kernel device tree.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The upstream binding and driver implementation only supports
reboot modes of 32-bit length. This is insufficient for cases where
multiple registers need to be written for the reboot mode to become
active. The i.MX6 is an example for this, the BootROM expects a second
32-bit register to indicate whether the reboot mode in the first is
valid. In preparation for adding support for this to the
syscon-reboot-mode driver. Migrate the reboot-mode core to support this.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Instead of relying that the kernel and barebox device trees are in sync,
just enforce it by having barebox fix up the device tree node it probed
into the kernel device tree. We usually want that, but some reboot mode
drivers might want to inhibit the fixup, e.g. because they implement
a non-upstream binding or because they communicate with the BootROM,
while the kernel shouldn't. For those the fixup is made optional via
a struct reboot_mode_driver::no_fixup member.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Reboot modes are one-shot information that should be valid for only a
single reset. Syscons that survive a warm reset are one way to implement
this. This is used by many BootROMs to allow falling into a recovery
mode on the next boot. This ports the Linux syscon-reboot-mode support.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Reboot modes provide a well-defined way to exchange information between
different stage of the boot process. When configured, users can type
`reboot bootloader` in the OS and barebox can read it out a device
parameter. Likewise barebox can write a reboot mode for the BootROM to
evaluate and then reset to fall into a serial recovery mode for example.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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