Commit 
75096579c3ac ("lib: devres: Introduce devm_ioremap_resource()")
introduced devm_ioremap_resource() and deprecated the use of
devm_request_and_ioremap().
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
CC: linux-gpio@vger.kernel.org
CC: Grant Likely <grant.likely@linaro.org>
CC: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
 
        if (!chip)
                return -ENOMEM;
        chip->dev = &dev->dev;
-       chip->reg_base = devm_request_and_ioremap(&dev->dev, res);
+       chip->reg_base = devm_ioremap_resource(&dev->dev, res);
+       if (IS_ERR(chip->reg_base))
+               return PTR_ERR(chip->reg_base);
 
        for (i = 0; i < GSTA_NR_BLOCKS; i++) {
                chip->regs[i] = chip->reg_base + i * 4096;