Re: [PATCH 4/4] iio: adc: add support for ad4052

kernel test robot
2025-03-07T14:22:19Z

Hi Jorge,

kernel test robot noticed the following build warnings:

[auto build test WARNING on aac287ec80d71a7ab7e44c936a434625417c3e30]

url: https://github.com/intel-lab-lkp/linux/commits/Jorge-Marques/iio-code-mark-iio_dev-as-const-in-iio_buffer_enabled/20250306-220719
base: aac287ec80d71a7ab7e44c936a434625417c3e30
patch link: https://lore.kernel.org/r/20250306-iio-driver-ad4052-v1-4-2badad30116c%40analog.com
patch subject: [PATCH 4/4] iio: adc: add support for ad4052
config: um-randconfig-r073-20250307 (https://download.01.org/0day-ci/archive/20250308/202503080031.APfLdyiz-lkp@intel.com/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250308/202503080031.APfLdyiz-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202503080031.APfLdyiz-lkp@intel.com/

All warnings (new ones prefixed by >>):

In file included from drivers/iio/adc/ad4052.c:14:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:549:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
549 | val = __raw_readb(PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:567:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
567 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
| ^
In file included from drivers/iio/adc/ad4052.c:14:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:585:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
585 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
| ~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
35 | #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
| ^
In file included from drivers/iio/adc/ad4052.c:14:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:5:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:14:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:601:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
601 | __raw_writeb(value, PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:616:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
616 | __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:631:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
631 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:724:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
724 | readsb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:737:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
737 | readsw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:750:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
750 | readsl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:764:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
764 | writesb(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:778:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
778 | writesw(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
include/asm-generic/io.h:792:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
792 | writesl(PCI_IOBASE + addr, buffer, count);
| ~~~~~~~~~~ ^
>> drivers/iio/adc/ad4052.c:201:41: warning: unused variable 'ad4052_regmap_rd_table' [-Wunused-const-variable]
201 | static const struct regmap_access_table ad4052_regmap_rd_table = {
| ^~~~~~~~~~~~~~~~~~~~~~
>> drivers/iio/adc/ad4052.c:214:41: warning: unused variable 'ad4052_regmap_wr_table' [-Wunused-const-variable]
214 | static const struct regmap_access_table ad4052_regmap_wr_table = {
| ^~~~~~~~~~~~~~~~~~~~~~
>> drivers/iio/adc/ad4052.c:239:18: warning: unused variable 'ad4052_sample_rate_avail' [-Wunused-const-variable]
239 | static const int ad4052_sample_rate_avail[] = {
| ^~~~~~~~~~~~~~~~~~~~~~~~
15 warnings generated.

vim +/ad4052_regmap_rd_table +201 drivers/iio/adc/ad4052.c

200
> 201 static const struct regmap_access_table ad4052_regmap_rd_table = {
202 .yes_ranges = ad4052_regmap_rd_ranges,
203 .n_yes_ranges = ARRAY_SIZE(ad4052_regmap_rd_ranges),
204 };
205
206 static const struct regmap_range ad4052_regmap_wr_ranges[] = {
207 regmap_reg_range(AD4052_REG_INTERFACE_CONFIG_A, AD4052_REG_DEVICE_CONFIG),
208 regmap_reg_range(AD4052_REG_SCRATCH_PAD, AD4052_REG_SCRATCH_PAD),
209 regmap_reg_range(AD4052_REG_STREAM_MODE, AD4052_REG_INTERFACE_STATUS),
210 regmap_reg_range(AD4052_REG_MODE_SET, AD4052_REG_MON_VAL),
211 regmap_reg_range(AD4052_REG_FUSE_CRC, AD4052_REG_DEVICE_STATUS),
212 };
213
> 214 static const struct regmap_access_table ad4052_regmap_wr_table = {
215 .yes_ranges = ad4052_regmap_wr_ranges,
216 .n_yes_ranges = ARRAY_SIZE(ad4052_regmap_wr_ranges),
217 };
218
219 static const struct iio_event_spec ad4052_events[] = {
220 {
221 .type = IIO_EV_TYPE_THRESH,
222 .dir = IIO_EV_DIR_EITHER,
223 .mask_shared_by_all = BIT(IIO_EV_INFO_ENABLE)
224 },
225 {
226 .type = IIO_EV_TYPE_THRESH,
227 .dir = IIO_EV_DIR_RISING,
228 .mask_shared_by_all = BIT(IIO_EV_INFO_VALUE) |
229 BIT(IIO_EV_INFO_HYSTERESIS)
230 },
231 {
232 .type = IIO_EV_TYPE_THRESH,
233 .dir = IIO_EV_DIR_FALLING,
234 .mask_shared_by_all = BIT(IIO_EV_INFO_VALUE) |
235 BIT(IIO_EV_INFO_HYSTERESIS)
236 }
237 };
238
> 239 static const int ad4052_sample_rate_avail[] = {
240 2000000, 1000000, 300000, 100000, 33300,
241 10000, 3000, 500, 333, 250, 200,
242 166, 140, 125, 111
243 };
244

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