1. devel@lists.zephyrproject.org

Re: override alias in test application

Bolivar, Marti
 

Hello,

There's no need to open an issue.

The alias should be named eeprom-0 in a DTS file,

aliases {
eeprom-0 = ...;
};

but needs to be eeprom_0 (i.e. "lowercase-and-underscores" form) in C,
because "-" is not part of a valid C identifier.

For details, please see the DT_ALIAS documentation:
https://docs.zephyrproject.org/latest/reference/devicetree/index.html#c.DT_ALIAS

In particular,

"Convert non-alphanumeric characters in the alias property to
underscores to form valid C tokens, and lowercase all letters."

Please see also this section in the troubleshooting section in the
deviceetree HOWTOs:

https://docs.zephyrproject.org/latest/guides/dts/howtos.html#make-sure-you-re-using-the-right-names

Thanks,
Marti

Stefano Manni <stefano.manni@gmail.com> writes:

Hi Carles,

thanks, I managed like this:

/ {
aliases {
eeprom_0 = &eeprom0;
};
};

but eeprom_0 is not a valid alias:

dtlib.DTError: /aliases: alias property name 'eeprom_0' should include
only characters from [0-9a-z-]

may I open an issue?

Stefano

Il giorno mar 9 giu 2020 alle ore 10:27 Cufi, Carles
<Carles.Cufi@nordicsemi.no> ha scritto:

For properties there is /delete-property/ to delete one and then be able to override it.
In the case of an alias I am not sure, have you tried to override it directly?

Carles

On 08/06/2020, 19:31, "devel@lists.zephyrproject.org on behalf of Stefano Manni via lists.zephyrproject.org" <devel@lists.zephyrproject.org on behalf of stefano.manni=gmail.com@lists.zephyrproject.org> wrote:

Hi there,

I'm trying to compile test/drivers/eeprom for my board. I see that the
code requires the alias 'eeprom_0' defined, but my board does not have
it natively.

I managed to compile changing in the test app some lines like below:

- eeprom = device_get_binding(DT_LABEL(DT_ALIAS(eeprom_0)));
+ eeprom = device_get_binding(DT_LABEL(DT_NODELABEL(eeprom0)));

where eeprom0 is defined in an overlay for my boards.

But I'd prefer to use the alias and not change the app.
What is the right way to override an alias in an overlay file? Sorry
if my question is already addressed somewhere in documentation.

Another consideration: is 'eeprom_0' a valid name? Alias properties
should include only characters from [0-9a-z-]. May we need to fix it?

Thanks,
Stefano
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