Re: [PATCH 2/2] leds: lm3601x: Introduce the lm3601x LED driver

From: kbuild test robot
Date: Tue May 08 2018 - 02:36:41 EST


Hi Dan,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on robh/for-next]
[also build test WARNING on v4.17-rc4 next-20180507]
[cannot apply to j.anaszewski-leds/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Dan-Murphy/dt-bindings-lm3601x-Introduce-the-lm3601x-driver/20180508-074439
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=ia64

All warnings (new ones prefixed by >>):

In file included from drivers/leds/leds-lm3601x.c:13:0:
drivers/leds/leds-lm3601x.c: In function 'lm3601x_strobe_brightness_set':
>> drivers/leds/leds-lm3601x.c:272:6: warning: large integer implicitly truncated to unsigned type [-Woverflow]
~LM3601X_MODE_STROBE, LED_OFF);
^
include/linux/regmap.h:76:36: note: in definition of macro 'regmap_update_bits'
regmap_update_bits_base(map, reg, mask, val, NULL, false, false)
^~~~

vim +272 drivers/leds/leds-lm3601x.c

258
259 static int lm3601x_strobe_brightness_set(struct led_classdev *cdev,
260 enum led_brightness brightness)
261 {
262 struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
263 struct lm3601x_led *led = fled_cdev_to_led(fled_cdev);
264 int ret;
265 u8 brightness_val;
266
267 mutex_lock(&led->lock);
268 ret = lm3601x_read_faults(led);
269
270 if (brightness == LED_OFF) {
271 ret = regmap_update_bits(led->regmap, LM3601X_ENABLE_REG,
> 272 ~LM3601X_MODE_STROBE, LED_OFF);
273 goto out;
274 }
275
276 if (brightness == LED_ON)
277 brightness_val = LED_ON;
278 else
279 brightness_val = (brightness/2);
280
281 ret = regmap_write(led->regmap, LM3601X_LED_FLASH_REG, brightness_val);
282
283 out:
284 mutex_unlock(&led->lock);
285 return ret;
286 }
287

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