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SubjectRe: [PATCH 1/2] iio: chemical: bme680: Add device-tree support
Hi Sebastien,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on iio/togreg]
[also build test ERROR on v5.0-rc1 next-20190111]
[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/Sebastien-Bourdelin/iio-chemical-bme680-Add-device-tree-support/20190114-063618
base: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git togreg
config: i386-randconfig-x007-201902 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All error/warnings (new ones prefixed by >>):

In file included from include/linux/acpi.h:41:0,
from drivers/iio/chemical/bme680_spi.c:7:
include/linux/module.h:213:1: error: expected ',' or ';' before 'extern'
extern typeof(name) __mod_##type##__##name##_device_table \
^
>> drivers/iio/chemical/bme680_spi.c:117:1: note: in expansion of macro 'MODULE_DEVICE_TABLE'
MODULE_DEVICE_TABLE(of, bme680_of_spi_match);
^~~~~~~~~~~~~~~~~~~
>> drivers/iio/chemical/bme680_spi.c:123:22: error: implicit declaration of function 'of_match_ptr'; did you mean 'hash_ptr'? [-Werror=implicit-function-declaration]
.of_match_table = of_match_ptr(bme680_of_spi_match),
^~~~~~~~~~~~
hash_ptr
>> drivers/iio/chemical/bme680_spi.c:123:22: warning: initialization makes pointer from integer without a cast [-Wint-conversion]
drivers/iio/chemical/bme680_spi.c:123:22: note: (near initialization for 'bme680_spi_driver.driver.of_match_table')
>> drivers/iio/chemical/bme680_spi.c:123:22: error: initializer element is not constant
drivers/iio/chemical/bme680_spi.c:123:22: note: (near initialization for 'bme680_spi_driver.driver.of_match_table')
cc1: some warnings being treated as errors

vim +123 drivers/iio/chemical/bme680_spi.c

> 7 #include <linux/acpi.h>
8 #include <linux/module.h>
9 #include <linux/regmap.h>
10 #include <linux/spi/spi.h>
11
12 #include "bme680.h"
13
14 static int bme680_regmap_spi_write(void *context, const void *data,
15 size_t count)
16 {
17 struct spi_device *spi = context;
18 u8 buf[2];
19
20 memcpy(buf, data, 2);
21 /*
22 * The SPI register address (= full register address without bit 7)
23 * and the write command (bit7 = RW = '0')
24 */
25 buf[0] &= ~0x80;
26
27 return spi_write_then_read(spi, buf, 2, NULL, 0);
28 }
29
30 static int bme680_regmap_spi_read(void *context, const void *reg,
31 size_t reg_size, void *val, size_t val_size)
32 {
33 struct spi_device *spi = context;
34
35 return spi_write_then_read(spi, reg, reg_size, val, val_size);
36 }
37
38 static struct regmap_bus bme680_regmap_bus = {
39 .write = bme680_regmap_spi_write,
40 .read = bme680_regmap_spi_read,
41 .reg_format_endian_default = REGMAP_ENDIAN_BIG,
42 .val_format_endian_default = REGMAP_ENDIAN_BIG,
43 };
44
45 static int bme680_spi_probe(struct spi_device *spi)
46 {
47 const struct spi_device_id *id = spi_get_device_id(spi);
48 struct regmap *regmap;
49 unsigned int val;
50 int ret;
51
52 spi->bits_per_word = 8;
53 ret = spi_setup(spi);
54 if (ret < 0) {
55 dev_err(&spi->dev, "spi_setup failed!\n");
56 return ret;
57 }
58
59 regmap = devm_regmap_init(&spi->dev, &bme680_regmap_bus,
60 &spi->dev, &bme680_regmap_config);
61 if (IS_ERR(regmap)) {
62 dev_err(&spi->dev, "Failed to register spi regmap %d\n",
63 (int)PTR_ERR(regmap));
64 return PTR_ERR(regmap);
65 }
66
67 ret = regmap_write(regmap, BME680_REG_SOFT_RESET_SPI,
68 BME680_CMD_SOFTRESET);
69 if (ret < 0) {
70 dev_err(&spi->dev, "Failed to reset chip\n");
71 return ret;
72 }
73
74 /* after power-on reset, Page 0(0x80-0xFF) of spi_mem_page is active */
75 ret = regmap_read(regmap, BME680_REG_CHIP_SPI_ID, &val);
76 if (ret < 0) {
77 dev_err(&spi->dev, "Error reading SPI chip ID\n");
78 return ret;
79 }
80
81 if (val != BME680_CHIP_ID_VAL) {
82 dev_err(&spi->dev, "Wrong chip ID, got %x expected %x\n",
83 val, BME680_CHIP_ID_VAL);
84 return -ENODEV;
85 }
86 /*
87 * select Page 1 of spi_mem_page to enable access to
88 * to registers from address 0x00 to 0x7F.
89 */
90 ret = regmap_write_bits(regmap, BME680_REG_STATUS,
91 BME680_SPI_MEM_PAGE_BIT,
92 BME680_SPI_MEM_PAGE_1_VAL);
93 if (ret < 0) {
94 dev_err(&spi->dev, "failed to set page 1 of spi_mem_page\n");
95 return ret;
96 }
97
98 return bme680_core_probe(&spi->dev, regmap, id->name);
99 }
100
101 static const struct spi_device_id bme680_spi_id[] = {
102 {"bme680", 0},
103 {},
104 };
105 MODULE_DEVICE_TABLE(spi, bme680_spi_id);
106
107 static const struct acpi_device_id bme680_acpi_match[] = {
108 {"BME0680", 0},
109 {},
110 };
111 MODULE_DEVICE_TABLE(acpi, bme680_acpi_match);
112
113 static const struct of_device_id bme680_of_spi_match[] = {
114 { .compatible = "bosch,bme680", },
115 {},
116 }
> 117 MODULE_DEVICE_TABLE(of, bme680_of_spi_match);
118
119 static struct spi_driver bme680_spi_driver = {
120 .driver = {
121 .name = "bme680_spi",
122 .acpi_match_table = ACPI_PTR(bme680_acpi_match),
> 123 .of_match_table = of_match_ptr(bme680_of_spi_match),
124 },
125 .probe = bme680_spi_probe,
126 .id_table = bme680_spi_id,
127 };
128 module_spi_driver(bme680_spi_driver);
129

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