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In order to be able to generate debugfs output without having to actually reach the flash, create a SPI NOR local cache of the status registers. What matters in our case are all the bits related to sector locking. As such, in order to make it clear that this cache is not intended to be used anywhere else, we zero the irrelevant bits. The cache is initialized once during the early init, and then maintained every time the write protection scheme is updated. Suggested-by: Michael Walle <mwalle@kernel.org> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Pratyush Yadav <pratyush@kernel.org>