regulator: gpio: properly check return value of of_get_named_gpio

The function of_get_named_gpio() could return -ENOENT, -EPROBE_DEFER
-EINVAL and so on. Currently, for the optional property "enable-gpio",
we only check -EPROBE_DEFER, this is not enough since there may be
misconfigured "enable-gpio" in the DTB, of_get_named_gpio() will return
-EINVAL in this case, we should return immediately here. And for the
optional property "gpios", we didn't check the return value, the driver
will continue to the point where gpio_request_array() is called, it
doesn't make sense to continue if we got -EPROBE_DEFER or -EINVAL here.

This patch tries to address these two issues by properly checking the
return value of of_get_named_gpio.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

path: root/drivers/usb/dwc2/debug.h

/**
 * debug.h - Designware USB2 DRD controller debug header
 *
 * Copyright (C) 2015 Intel Corporation
 * Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include "core.h"

#ifdef CONFIG_DEBUG_FS
extern int dwc2_debugfs_init(struct dwc2_hsotg *);
extern void dwc2_debugfs_exit(struct dwc2_hsotg *);
#else
static inline int dwc2_debugfs_init(struct dwc2_hsotg *hsotg)
{  return 0;  }
static inline void dwc2_debugfs_exit(struct dwc2_hsotg *hsotg)
{  }
#endif