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This patch adds support for Over Current Protection (OCP) to the Realtek USB card reader driver. The OCP mechanism protects the hardware by detecting and handling current overload conditions. This implementation includes: - Register configurations to enable OCP monitoring. - Handling of OCP interrupt events and associated error reporting. - Card power management changes in response to OCP triggers. This enhancement improves the robustness of the driver when operating in environments where electrical anomalies may occur, particularly with SD and MS card interfaces. Signed-off-by: Ricky Wu <ricky_wu@realtek.com> Link: https://lore.kernel.org/r/20250812030811.2426112-1-ricky_wu@realtek.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>