This adds support for an optional device-tree property that
makes the driver skip all the delays around clocking the
GPIOs and set it in the device-tree of common POWER9 based
OpenPower platforms.
This useful on chips like the AST2500 where the GPIO block is
running at a fairly low clock frequency (25Mhz typically). In
this case, the delays are unnecessary and due to the low
precision of the timers, actually quite harmful in terms of
performance.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Add GPIO key to check presence of PCIE E2B.
Signed-off-by: Lei YU <mine260309@gmail.com>
Acked-by: Xo Wang <xow@google.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
These BMC systems require this device to communicate with the host.
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Zaius is a POWER9 platform announced at OpenPOWER Summit 2016. This adds
basic DTS support for its AST2500 BMC.
This adds the device tree description for most upstream components. It
is a squashed commit of all of the patches from the OpenBMC kernel tree.
Signed-off-by: Xo Wang <xow@google.com>
Signed-off-by: Patrick Venture <venture@google.com>
Signed-off-by: Robert Lippert <rlippert@google.com>
Signed-off-by: Peter Hanson <peterh@google.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Rick Altherr <raltherr@google.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
