The ZynqMP features eight 32-bit global storage registers that are
available for general use. Four of them have their values preserved
after software reboots and four are cleared on software reboots.
In Linux they are accessed as:
/sys/firmware/zynqmp/ggs[0-4]
/sys/firmware/zynqmp/pggs[0-4]
Allow reading and writing these parameters from barebox board code
via exported functions and from barebox shell as well via device
parameters:
echo ${firmware:zynqmp-firmware.of.ggs0}
firmware:zynqmp-firmware.of.pggs0=4
Because the name is a bit unwieldy, use the device alias support added
in this series to make the variables more compact:
echo ${zynqmp_fw.ggs0}
zynqmp_fw.pggs0=4
Ahmad Fatoum (3):
driver: add support for device aliases
firmware-zynqmp: export functions for setting GGS/PGGS
firmware-zynqmp: add device parameters for ggs/pggs
arch/arm/mach-zynqmp/firmware-zynqmp.c | 133 +++++++++++++++++++++++++
common/complete.c | 14 ++-
drivers/base/driver.c | 46 +++++++++
include/driver.h | 7 ++
include/mach/zynqmp/firmware-zynqmp.h | 33 +++++-
5 files changed, 222 insertions(+), 11 deletions(-)
--
2.39.2
