counter: 104-quad-8: Add lock guards - filter clock prescaler
Add lock protection from race conditions to the 104-quad-8 counter driver for filter clock prescaler code changes. Mutex calls used for protection. Signed-off-by: Syed Nayyar Waris <syednwaris@gmail.com> Fixes: de65d055 ("counter: 104-quad-8: Support Filter Clock Prescaler") Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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