linux-kernel - [PATCH] leds: lm355x: avoid enum conversion warning

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Date:   Tue,  5 May 2020 16:19:17 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Bryan Wu <bryan.wu@...onical.com>,
        "G.Shark Jeong" <gshark.jeong@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Dan Murphy <dmurphy@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] leds: lm355x: avoid enum conversion warning

clang points out that doing arithmetic between diffent enums is usually
a mistake:

drivers/leds/leds-lm355x.c:167:28: warning: bitwise operation between different enumeration types ('enum lm355x_tx2' and 'enum lm355x_ntc') [-Wenum-enum-conversion]
                reg_val = pdata->pin_tx2 | pdata->ntc_pin;
                          ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
drivers/leds/leds-lm355x.c:178:28: warning: bitwise operation between different enumeration types ('enum lm355x_tx2' and 'enum lm355x_ntc') [-Wenum-enum-conversion]
                reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
                          ~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~

In this driver, it is intentional, so add a cast to hide the false-positive
warning. It appears to be the only instance of this warning at the moment.

Fixes: b98d13c72592 ("leds: Add new LED driver for lm355x chips")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/leds/leds-lm355x.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/leds/leds-lm355x.c b/drivers/leds/leds-lm355x.c
index 11ce05249751..b2eb2e1e9c04 100644
--- a/drivers/leds/leds-lm355x.c
+++ b/drivers/leds/leds-lm355x.c
@@ -164,18 +164,19 @@ static int lm355x_chip_init(struct lm355x_chip_data *chip)
 	/* input and output pins configuration */
 	switch (chip->type) {
 	case CHIP_LM3554:
-		reg_val = pdata->pin_tx2 | pdata->ntc_pin;
+		reg_val = (u32)pdata->pin_tx2 | (u32)pdata->ntc_pin;
 		ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
 		if (ret < 0)
 			goto out;
-		reg_val = pdata->pass_mode;
+		reg_val = (u32)pdata->pass_mode;
 		ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
 		if (ret < 0)
 			goto out;
 		break;
 
 	case CHIP_LM3556:
-		reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
+		reg_val = (u32)pdata->pin_tx2 | (u32)pdata->ntc_pin |
+		          (u32)pdata->pass_mode;
 		ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
 		if (ret < 0)
 			goto out;
-- 
2.26.0