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The existing sideband driver only registers sidebands without tracking their active usage. To address this, sideband will now record its active usage when it creates/removes interrupters. In addition, a new api is introduced to provide a means for other dirvers to fetch sideband activity information on a USB host controller. Signed-off-by: Guan-Yu Lin <guanyulin@google.com> Link: https://lore.kernel.org/r/20250911142051.90822-4-guanyulin@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20250911142051.90822-4-guanyulin@google.com