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Add zynqmp_pm_get_pmc_global_pggs_reg() to read PMC Global PGGS3 and PGGS4 registers via firmware IOCTL. Supports IOCTL_READ_PGGS as the preferred path and falls back to IOCTL_READ_REG for older PLM firmware versions that do not support IOCTL_READ_PGGS. Signed-off-by: Padmarao Begari <padmarao.begari@amd.com> Signed-off-by: Michal Simek <michal.simek@amd.com> Link: https://lore.kernel.org/r/20260514102601.1759779-3-padmarao.begari@amd.com