STM32F7_I2C_OAR2
oar2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR2);
writel_relaxed(oar2, i2c_dev->base + STM32F7_I2C_OAR2);
stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR2, mask);
backup_regs->oar2 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR2);
writel_relaxed(backup_regs->oar2, i2c_dev->base + STM32F7_I2C_OAR2);