GPIO : support ascend_gpio_dwapb_enable switch

ascend inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4JMQA

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Hi everyone,
This patch register a setup function for ascend gpio driver.
With this patch, we can enable ascend gpio function independently,
so that we can turn this feature on or off through bootargs.
Signed-off-by: Nzhangguijiang <zhangguijiang@huawei.com>
Reviewed-by: NDing Tianhong <dingtianhong@huawei.com>
Reviewed-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/gpio/gpio-dwapb.c

@@ -71,6 +71,14 @@ bool enable_ascend_mini_gpio_dwapb;
 bool enable_ascend_gpio_dwapb;
 struct dwapb_gpio;
 
+static int __init enable_ascend_gpio_dwapb_setup(char *str)
+{
+	enable_ascend_gpio_dwapb = true;
+
+	return 1;
+}
+__setup("enable_ascend_gpio_dwapb", enable_ascend_gpio_dwapb_setup);
+
 #ifdef CONFIG_PM_SLEEP
 /* Store GPIO context across system-wide suspend/resume transitions */
 struct dwapb_context {