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pinctrl: stm32: prevent the use of the secure protected pins
The hardware denies any access from the Linux non-secure world to the secure-protected pins. Hence, prevent any driver to request such a pin. Mark the secure-protected GPIO lines as invalid (.init_valid_mask) and prevent the pinmux request / pinconf setting operations. Identify the secure pins with "NO ACCESS" in the pinconf sysfs. Signed-off-by: Fabien Dessenne <fabien.dessenne@foss.st.com>
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