linux-kernel - [PATCH v1 2/2] extcon: axp288: Use for_each_set_bit() in axp288_extcon_log

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Date:   Thu, 25 Jul 2019 23:34:05 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 2/2] extcon: axp288: Use for_each_set_bit() in axp288_extcon_log_rsi()

This simplifies and standardizes axp288_extcon_log_rsi()
by using for_each_set_bit() library function.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/extcon/extcon-axp288.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
index 4cbcc3b1aa6b..670334c362ac 100644
--- a/drivers/extcon/extcon-axp288.c
+++ b/drivers/extcon/extcon-axp288.c
@@ -121,7 +121,6 @@ static const char * const axp288_pwr_up_down_info[] = {
 	"Last shutdown caused by PMIC UVLO threshold",
 	"Last shutdown caused by SOC initiated cold off",
 	"Last shutdown caused by user pressing the power button",
-	NULL,
 };
 
 /*
@@ -130,20 +129,18 @@ static const char * const axp288_pwr_up_down_info[] = {
  */
 static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
 {
-	const char * const *rsi;
 	unsigned int val, i, clear_mask = 0;
+	unsigned long bits;
 	int ret;
 
 	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
 	if (ret < 0)
 		return;
 
-	for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
-		if (val & BIT(i)) {
-			dev_dbg(info->dev, "%s\n", *rsi);
-			clear_mask |= BIT(i);
-		}
-	}
+	bits = val & GENMASK(ARRAY_SIZE(axp288_pwr_up_down_info) - 1, 0);
+	for_each_set_bit(i, &bits, ARRAY_SIZE(axp288_pwr_up_down_info))
+		dev_dbg(info->dev, "%s\n", axp288_pwr_up_down_info[i]);
+	clear_mask = bits;
 
 	/* Clear the register value for next reboot (write 1 to clear bit) */
 	regmap_write(info->regmap, AXP288_PS_BOOT_REASON_REG, clear_mask);
-- 
2.20.1