quoted

+	struct i2c_adapter_quirks *quirks;
 };
 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 

I suggest to add const.
	const struct i2c_adapter_quirks *quirks;

also, in i2c-core.c, should modify:
	const struct i2c_adapter_quirks *q = adap->quirks;

Thanks, I'll think about it.

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