Re: [PATCH v1 2/2] hwmon: npcm-pwm: add NPCM7xx PWM driver
From: Guenter Roeck
Date: Thu May 31 2018 - 09:15:11 EST
On 05/31/2018 12:16 AM, kbuild test robot wrote:
Hi Tomer,
I love your patch! Perhaps something to improve:
[auto build test WARNING on hwmon/hwmon-next]
[also build test WARNING on v4.17-rc7]
[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/Tomer-Maimon/dt-binding-hwmon-Add-NPCM7xx-PWM-documentation/20180531-034040
base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: x86_64-allmodconfig
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
make ARCH=x86_64 allmodconfig
make ARCH=x86_64
All warnings (new ones prefixed by >>):
vim +277 drivers/hwmon/npcm7xx-pwm.c
250
251 static int npcm7xx_pwm_probe(struct platform_device *pdev)
252 {
253 struct device *dev = &pdev->dev;
254 struct npcm7xx_pwm_data *data;
255 struct resource res[NPCM7XX_PWM_MAX_MODULES];
256 struct device *hwmon;
257 struct clk *clk;
258 int m, ch, res_cnt, ret;
259 u32 Prescale_val, output_freq;
260
261 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
262 if (!data)
263 return -ENOMEM;
264
265 for (res_cnt = 0; res_cnt < NPCM7XX_PWM_MAX_MODULES ; res_cnt++) {
266 ret = of_address_to_resource(dev->of_node, res_cnt,
267 &res[res_cnt]);
268 if (ret) {
269 pr_err("PWM of_address_to_resource fail ret %d\n",
270 ret);
271 return -EINVAL;
272 }
273
274 data->pwm_base[res_cnt] =
275 devm_ioremap_resource(dev, &(res[res_cnt]));
> 276 pr_debug("pwm%d base is 0x%08X, res.start 0x%08X , size 0x%08X\n",
> 277 res_cnt, (u32)data->pwm_base[res_cnt],
278 res[res_cnt].start, resource_size(&(res[res_cnt])));
279
No idea what the tool is complaining about, but the messages should use dev_ functions.
280 if (!data->pwm_base[res_cnt]) {
281 pr_err("pwm probe failed: can't read pwm base address for resource %d.\n",
282 res_cnt);
283 return -ENOMEM;
284 }
285
286 mutex_init(&data->npcm7xx_pwm_lock[res_cnt]);
287 }
288
289 clk = devm_clk_get(dev, NULL);
290 if (IS_ERR(clk))
291 return -ENODEV;
292
293 data->clk_freq = clk_get_rate(clk);
294
295 /* Adjust NPCM7xx PWMs output frequency to ~25Khz */
296 output_freq = data->clk_freq / PWN_CNT_DEFAULT;
297 Prescale_val = DIV_ROUND_CLOSEST(output_freq, PWM_OUTPUT_FREQ_25KHZ);
298
299 /* If Prescale_val = 0, then the prescale output clock is stopped */
300 if (Prescale_val < MIN_PRESCALE1)
301 Prescale_val = MIN_PRESCALE1;
302 /*
303 * Prescale_val need to decrement in one because in the PWM Prescale
304 * register the Prescale value increment by one
305 */
306 Prescale_val--;
307
308 /* Setting PWM Prescale Register value register to both modules */
309 Prescale_val |= (Prescale_val << NPCM7XX_PWM_PRESCALE_SHIFT_CH01);
310
311 for (m = 0; m < NPCM7XX_PWM_MAX_MODULES ; m++) {
312 iowrite32(Prescale_val,
313 data->pwm_base[m] + NPCM7XX_PWM_REG_PR);
314 iowrite32(NPCM7XX_PWM_PRESCALE2_DEFALUT,
315 data->pwm_base[m] + NPCM7XX_PWM_REG_CSR);
316 iowrite32(NPCM7XX_PWM_CTRL_MODE_DEFALUT,
317 data->pwm_base[m] + NPCM7XX_PWM_REG_CR);
318
319 for (ch = 0; ch < NPCM7XX_PWM_MAX_CHN_NUM; ch++) {
320 iowrite32(NPCM7XX_PWM_COUNTER_DEFALUT_NUM,
321 data->pwm_base[m] + NPCM7XX_PWM_REG_CNRx(ch));
322 iowrite32(NPCM7XX_PWM_COMPARATOR_DEFALUT_NUM,
323 data->pwm_base[m] + NPCM7XX_PWM_REG_CMRx(ch));
324 }
325
326 iowrite32(NPCM7XX_PWM_CTRL_MODE_DEFALUT |
327 NPCM7XX_PWM_CTRL_EN_DEFALUT,
328 data->pwm_base[m] + NPCM7XX_PWM_REG_CR);
329 }
330
331 hwmon = devm_hwmon_device_register_with_info(dev, "npcm7xx_pwm", data,
332 &npcm7xx_chip_info, NULL);
333
334 if (IS_ERR(hwmon)) {
335 pr_err("PWM Driver failed - devm_hwmon_device_register_with_groups failed\n");
336 return PTR_ERR(hwmon);
337 }
338
339 pr_info("NPCM7XX PWM Driver probed, PWM output Freq %dHz\n",
340 output_freq / ((Prescale_val & 0xf) + 1));
341
342 return 0;
343 }
344
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