STM32F7_I2C_OAR1
oar1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR1);
writel_relaxed(oar1, i2c_dev->base + STM32F7_I2C_OAR1);
stm32f7_i2c_clr_bits(base + STM32F7_I2C_OAR1, mask);
backup_regs->oar1 = readl_relaxed(i2c_dev->base + STM32F7_I2C_OAR1);
writel_relaxed(backup_regs->oar1, i2c_dev->base + STM32F7_I2C_OAR1);