target as paramter in device tree

[kuba_moo]

It would be useful to be able to select I2C bus to which device is connected in overlays. As an example the i2c-rtc overlay currently has "target" property set to <&i2c1>. I would like to be able to configure this target with a parameter in config.txt, like this:

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dtoverlay=i2c-rtc,ds1307,bus=i2c0

with overlay modified like this:

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f0: fragment@0 {
<...>
};
__overrides__ {
        bus = <&f0>,"target";
        <...>
};

I get following error:

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001931.126: dterror: phandle 18 not found

Is this problem possible to solve?