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Validate that attempts to read from write only registers fail and don't somehow trigger spurious hardware accesses. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20230613-regmap-kunit-read-write-v1-2-2db337c52827@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>