i2c: stm32f7: do not backup read-only PECR register
The PECR register provides received packet computed PEC value. It makes no sense restoring its value after a reset, and anyway, as read-only register it cannot be restored. Fixes: ea6dd25d ("i2c: stm32f7: add PM_SLEEP suspend/resume support") Signed-off-by: Alain Volmat <alain.volmat@st.com> Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@st.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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