Hi Gerd

Am 07.02.20 um 11:33 schrieb Gerd Hoffmann:
>> +static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = {
>> +	.destroy = drm_encoder_cleanup,
>> +};
>> +
>> +/**
>> + * drm_simple_encoder_init - Init a preallocated encoder
>> + * @dev: drm device
>> + * @funcs: callbacks for this encoder
>> + * @encoder_type: user visible type of the encoder
>> + * @name: printf style format string for the encoder name, or NULL
>> + *        for default name
>> + *
>> + * Initialises a preallocated encoder that has no further functionality. The
>> + * encoder will be released automatically.
>> + *
>> + * Returns:
>> + * Zero on success, error code on failure.
>> + */
>> +int drm_simple_encoder_init(struct drm_device *dev,
>> +			    struct drm_encoder *encoder,
>> +			    int encoder_type, const char *name, ...)
> 
> How about using
> 
> #define drm_simple_encoder_init(dev, type, name, ...) \
>         drm_encoder_init(dev, drm_simple_encoder_funcs_cleanup, type, name, __VA_ARGS__)
> 
> instead ?

I'd prefer a function call for aesthetic reasons and for not having to
export the drm_simple_encoder_funcs_cleanup. drm_simple_encoder_create()
is also a function and probably cannot be turned into a macro. So having
a function for drm_simple_encoder_init seems consequent.

I guess you want to save a few lines in the implementation of
drm_simple_encoder_init() (?) If so, I'd rather try to share more
internal code among the various init and create functions.

Best regards
Thomas

> 
> cheers,
>   Gerd
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer