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Date:   Sat, 21 Sep 2019 23:45:50 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dan Murphy <dmurphy@...com>
Cc:     kbuild-all@...org, jacek.anaszewski@...il.com, pavel@....cz,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dan Murphy <dmurphy@...com>
Subject: Re: [PATCH v7 9/9] leds: Update the lp55xx to use the multi color
 framework

Hi Dan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3 next-20190919]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Dan-Murphy/Multicolor-Framework-updates/20190920-023813
config: i386-randconfig-b003-201937 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 
:::::: branch date: 4 hours ago
:::::: commit date: 4 hours ago

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   ld: drivers/leds/leds-lp55xx-common.o: in function `lp55xx_set_brightness':
>> drivers/leds/leds-lp55xx-common.c:144: undefined reference to `led_mc_calc_brightness'
   ld: drivers/leds/leds-lp55xx-common.o: in function `lp55xx_init_led':
>> drivers/leds/leds-lp55xx-common.c:216: undefined reference to `led_classdev_multicolor_register_ext'

# https://github.com/0day-ci/linux/commit/d907bc23f70b4ca46747f42ec24a2066fa4602b0
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout d907bc23f70b4ca46747f42ec24a2066fa4602b0
vim +144 drivers/leds/leds-lp55xx-common.c

0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  133) 
95b2af637e283e Andrew Lunn       2015-08-20  134  static int lp55xx_set_brightness(struct led_classdev *cdev,
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  135) 			     enum led_brightness brightness)
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  136) {
a6e4679a09a0a2 Milo(Woogyom  Kim 2013-02-05  137) 	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
95b2af637e283e Andrew Lunn       2015-08-20  138  	struct lp55xx_device_config *cfg = led->chip->cfg;
d907bc23f70b4c Dan Murphy        2019-09-19  139  	int adj_value[LED_COLOR_ID_MAX];
d907bc23f70b4c Dan Murphy        2019-09-19  140  	int ret;
d907bc23f70b4c Dan Murphy        2019-09-19  141  	int i;
a6e4679a09a0a2 Milo(Woogyom  Kim 2013-02-05  142) 
d907bc23f70b4c Dan Murphy        2019-09-19  143  	if (led->mc_cdev.num_leds > 1) {
d907bc23f70b4c Dan Murphy        2019-09-19 @144  		led_mc_calc_brightness(&led->mc_cdev,
d907bc23f70b4c Dan Murphy        2019-09-19  145  				       brightness, adj_value);
d907bc23f70b4c Dan Murphy        2019-09-19  146  		for (i = 0; i < led->mc_cdev.num_leds; i++) {
d907bc23f70b4c Dan Murphy        2019-09-19  147  			led->brightness = adj_value[i];
d907bc23f70b4c Dan Murphy        2019-09-19  148  			ret = cfg->color_intensity_fn(led,
d907bc23f70b4c Dan Murphy        2019-09-19  149  						      led->grouped_channels[i]);
d907bc23f70b4c Dan Murphy        2019-09-19  150  			if (ret)
d907bc23f70b4c Dan Murphy        2019-09-19  151  				break;
d907bc23f70b4c Dan Murphy        2019-09-19  152  		}
d907bc23f70b4c Dan Murphy        2019-09-19  153  	} else {
a6e4679a09a0a2 Milo(Woogyom  Kim 2013-02-05  154) 		led->brightness = (u8)brightness;
d907bc23f70b4c Dan Murphy        2019-09-19  155  		ret = cfg->brightness_fn(led);
d907bc23f70b4c Dan Murphy        2019-09-19  156  	}
d907bc23f70b4c Dan Murphy        2019-09-19  157  
d907bc23f70b4c Dan Murphy        2019-09-19  158  	return ret;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  159) }
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  160) 
9e9b3db1b2f725 Milo(Woogyom  Kim 2013-02-05  161) static int lp55xx_init_led(struct lp55xx_led *led,
9e9b3db1b2f725 Milo(Woogyom  Kim 2013-02-05  162) 			struct lp55xx_chip *chip, int chan)
9e9b3db1b2f725 Milo(Woogyom  Kim 2013-02-05  163) {
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  164) 	struct lp55xx_platform_data *pdata = chip->pdata;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  165) 	struct lp55xx_device_config *cfg = chip->cfg;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  166) 	struct device *dev = &chip->cl->dev;
d907bc23f70b4c Dan Murphy        2019-09-19  167  	int max_channel = cfg->max_channel;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  168) 	char name[32];
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  169) 	int ret;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  170) 
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  171) 	if (chan >= max_channel) {
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  172) 		dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  173) 		return -EINVAL;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  174) 	}
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  175) 
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  176) 	if (pdata->led_config[chan].led_current == 0)
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  177) 		return 0;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  178) 
d907bc23f70b4c Dan Murphy        2019-09-19  179  	if (pdata->led_config[chan].name) {
d907bc23f70b4c Dan Murphy        2019-09-19  180  		led->cdev.name = pdata->led_config[chan].name;
d907bc23f70b4c Dan Murphy        2019-09-19  181  	} else {
d907bc23f70b4c Dan Murphy        2019-09-19  182  		snprintf(name, sizeof(name), "%s:channel%d",
d907bc23f70b4c Dan Murphy        2019-09-19  183  			pdata->label ? : chip->cl->name, chan);
d907bc23f70b4c Dan Murphy        2019-09-19  184  		led->cdev.name = name;
d907bc23f70b4c Dan Murphy        2019-09-19  185  	}
d907bc23f70b4c Dan Murphy        2019-09-19  186  
d907bc23f70b4c Dan Murphy        2019-09-19  187  	if (pdata->led_config[chan].num_colors > 1) {
d907bc23f70b4c Dan Murphy        2019-09-19  188  		led->mc_cdev.led_cdev = &led->cdev;
d907bc23f70b4c Dan Murphy        2019-09-19  189  		led->cdev.brightness_set_blocking = lp55xx_set_brightness;
d907bc23f70b4c Dan Murphy        2019-09-19  190  		led->cdev.groups = lp55xx_led_groups;
d907bc23f70b4c Dan Murphy        2019-09-19  191  		led->mc_cdev.num_leds = pdata->led_config[chan].num_colors;
d907bc23f70b4c Dan Murphy        2019-09-19  192  		led->mc_cdev.available_colors = pdata->led_config[chan].available_colors;
d907bc23f70b4c Dan Murphy        2019-09-19  193  		memcpy(led->channel_color,
d907bc23f70b4c Dan Murphy        2019-09-19  194  		       pdata->led_config[chan].channel_color,
d907bc23f70b4c Dan Murphy        2019-09-19  195  		       sizeof(led->channel_color));
d907bc23f70b4c Dan Murphy        2019-09-19  196  		memcpy(led->grouped_channels,
d907bc23f70b4c Dan Murphy        2019-09-19  197  		       pdata->led_config[chan].grouped_channels,
d907bc23f70b4c Dan Murphy        2019-09-19  198  		       sizeof(led->grouped_channels));
d907bc23f70b4c Dan Murphy        2019-09-19  199  	} else {
d907bc23f70b4c Dan Murphy        2019-09-19  200  
d907bc23f70b4c Dan Murphy        2019-09-19  201  		led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
d907bc23f70b4c Dan Murphy        2019-09-19  202  		led->cdev.brightness_set_blocking = lp55xx_set_brightness;
d907bc23f70b4c Dan Murphy        2019-09-19  203  	}	led->cdev.groups = lp55xx_led_groups;
d907bc23f70b4c Dan Murphy        2019-09-19  204  
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  205) 	led->led_current = pdata->led_config[chan].led_current;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  206) 	led->max_current = pdata->led_config[chan].max_current;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  207) 	led->chan_nr = pdata->led_config[chan].chan_nr;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  208) 
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  209) 	if (led->chan_nr >= max_channel) {
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  210) 		dev_err(dev, "Use channel numbers between 0 and %d\n",
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  211) 			max_channel - 1);
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  212) 		return -EINVAL;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  213) 	}
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  214) 
d907bc23f70b4c Dan Murphy        2019-09-19  215  	if (pdata->led_config[chan].num_colors > 1)
d907bc23f70b4c Dan Murphy        2019-09-19 @216  		ret = led_classdev_multicolor_register(dev, &led->mc_cdev);
d907bc23f70b4c Dan Murphy        2019-09-19  217  	else
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  218) 		ret = led_classdev_register(dev, &led->cdev);
d907bc23f70b4c Dan Murphy        2019-09-19  219  
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  220) 	if (ret) {
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  221) 		dev_err(dev, "led register err: %d\n", ret);
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  222) 		return ret;
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  223) 	}
0e2023463a3c94 Milo(Woogyom  Kim 2013-02-05  224) 
9e9b3db1b2f725 Milo(Woogyom  Kim 2013-02-05  225) 	return 0;
9e9b3db1b2f725 Milo(Woogyom  Kim 2013-02-05  226) }
9e9b3db1b2f725 Milo(Woogyom  Kim 2013-02-05  227) 

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