STM32F7_I2C_TIMINGR
backup_regs->tmgr = readl_relaxed(i2c_dev->base + STM32F7_I2C_TIMINGR);
writel_relaxed(backup_regs->tmgr, i2c_dev->base + STM32F7_I2C_TIMINGR);
writel_relaxed(timing, i2c_dev->base + STM32F7_I2C_TIMINGR);