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Use channel definition as root of trust and replace constant when reading elements directly using the raw sysfs attributes. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> Link: https://lore.kernel.org/r/20211104082413.3681212-11-gwendal@chromium.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>