regulator: core: Use DEVICE_ATTR_RO macro
Use DEVICE_ATTR_RO() helper instead of plain DEVICE_ATTR(), which makes the code a bit shorter and easier to read. Signed-off-by:YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20210529115226.25376-1-yuehaibing@huawei.comSigned-off-by:
Mark Brown <broonie@kernel.org>
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