drivers: smbus: fix multiple errors #99128
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The smbus driver initialization priority was previously set to `KERNEL_INIT_PRIORITY_DEFAULT` (which is 40). However, the default init priority of devices is typically `KERNEL_INIT_PRIORITY_DEVICE` (which is 50). Since the stm32 smbus driver uses a reference to the underlying i2c device, and since this driver was not being built in CI, this led to the discovery that the smbus driver was initialized too early. ```shell ERROR: Device initialization priority validation failed, the sequence of \ initialization calls does not match the devicetree dependencies. ERROR: /smbus1 <smbus_stm32_init> is initialized before its dependency \ /soc/i2c@40005400 <i2c_stm32_init> (POST_KERNEL+1 < POST_KERNEL+4) ``` By setting the initialization priority to `KERNEL_INIT_PRIORITY_DEVICE`, both smbus1 and i2c1 have their priorities evaluated in the same group, and it becomes possible to determine relative priorities via phandle dependency. Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
Previously, the function `smbus_stm32_pcall()` implicitly cast
`uint16_t *` to `uint8_t *`. Add an explicit cast to avoid warning.
```shell
..drivers/smbus/smbus_stm32.c:358:32: error: initialization of \
'uint8_t *' {aka 'unsigned char *'} from incompatible pointer type \
'uint16_t *' {aka 'short unsigned int *'} \
[-Werror=incompatible-pointer-types]
358 | .buf = &send_word,
| ^
..drivers/smbus/smbus_stm32.c:358:32: note: (near initialization \
for 'messages[1].buf')
..drivers/smbus/smbus_stm32.c:363:32: error: initialization of \
'uint8_t *' {aka 'unsigned char *'} from incompatible pointer type \
'uint16_t *' {aka 'short unsigned int *'} \
[-Werror=incompatible-pointer-types]
363 | .buf = recv_word,
| ^~~~~~~~~
```
Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
To ensure that code compiles error (and warning) free, add a build-all testsuite for smbus drivers. Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
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cfriedt
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This was referenced Nov 9, 2025
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etienne-lms
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Nov 10, 2025
mathieuchopstm
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erwango
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Adding the 4.3.0 milestone to this, since a regression was added during the stabilization period, since the change itself is quite self-contained, since it fixes multiple bugs, and since it improves stability. |
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Will determine at the release meeting if this is a "release blocker" and whether it will actually go in to the 4.3.0 release. |
jhedberg
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Nov 11, 2025
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This change fixes multiple errors in in the SMBus area.
CONFIG_KERNEL_INIT_PRIORITY_DEVICEWithout the first fix:
$ twister -i -c -p nucleo_g071rb -T tests/drivers/build_all/smbus/ ... Memory region Used Size Region Size %age Used FLASH: 83416 B 128 KB 63.64% RAM: 11 KB 36 KB 30.56% SRAM0: 0 GB 36 KB 0.00% IDT_LIST: 0 GB 32 KB 0.00% Generating files from ZEPHYR_BASE/twister-out/nucleo_g071rb_stm32g071xx/zephyr/tests/drivers/build_all/smbus/drivers.smbus.build.stm32/zephyr/zephyr.elf for board: nucleo_g071rb ERROR: Device initialization priority validation failed, the sequence of initialization calls does not match the devicetree dependencies. ERROR: /smbus1 <smbus_stm32_init> is initialized before its dependency /soc/i2c@40005400 <i2c_stm32_init> (POST_KERNEL+1 < POST_KERNEL+4) ninja: build stopped: subcommand failed. ...Without the second fix:
Testing done:
Fixes #99129
Fixes #99130
Fixes #99131