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This patch extends the mlxbf-bootctl driver's sysfs entries to support read access for the board's RTC battery status. A successful read from this attribute returns the status of the board's RTC battery. The RTC battery status register is also cleared upon successful read operation. Signed-off-by: Xiangrong Li <xiangrongl@nvidia.com> Reviewed-by: David Thompson <davthompson@nvidia.com> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20250124144655.48564-1-xiangrongl@nvidia.com Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>