Hi Andrew,
> Am 16.11.2017 um 19:32 schrieb Andrew F. Davis <afd@xxxxxx>:
>
> On 11/16/2017 12:18 PM, H. Nikolaus Schaller wrote:
>>
>>> Am 16.11.2017 um 18:08 schrieb Andrew F. Davis <afd@xxxxxx>:
>>>
>>> On 11/16/2017 10:10 AM, H. Nikolaus Schaller wrote:
>>>> Hi Andrew,
>>>>
>>>>> Am 16.11.2017 um 16:53 schrieb Andrew F. Davis <afd@xxxxxx>:
>>>>>
>>>>> On 11/16/2017 07:43 AM, H. Nikolaus Schaller wrote:
>>>>>>
>>>>>>> Am 16.11.2017 um 13:32 schrieb Tomi Valkeinen <tomi.valkeinen@xxxxxx>:
>>>>>>>
>>>>>>> On 16/11/17 10:50, H. Nikolaus Schaller wrote:
>>>>>>>> The vendor name was "toppoly" but other panels and the vendor list
>>>>>>>> have defined it as "tpo". So let's fix it in driver and bindings.
>>>>>>>>
>>>>>>>> Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
>>>>>>>> ---
>>>>>>>
>>>>>>>
>>>>>>>> -MODULE_ALIAS("spi:toppoly,td028ttec1");
>>>>>>>> +MODULE_ALIAS("spi:tpo,td028ttec1");
>>>>>>>
>>>>>>> Doesn't this mean that the module won't load if you have old bindings?
>>>>>>
>>>>>> Hm.
>>>>>>
>>>>>> Well, I think it can load but doesn't automatically from DT strings which might
>>>>>> be unexpected.
>>>>>>
>>>>>>> Can't we have two module aliases?
>>>>>>
>>>>>> I think we can. Just a random example:
>>>>>> https://elixir.free-electrons.com/linux/latest/source/drivers/w1/slaves/w1_therm.c#L754
>>>>>>
>>>>>> So we should keep both.
>>>>>
>>>>> Even better would be to drop both MODULE_ALIAS and let the
>>>>> MODULE_DEVICE_TABLE macro define them for your from the SPI id table.
>>>>
>>>> Why would that be better?
>>>>
>>>
>>> MODULE_ALIAS is ugly, you already have a table (usually) of device names
>>> that are supported by the driver, the module aliases should be generated
>>> from that table. This also keeps supported device list in one place.
>>>
>>>> As far as I see it will need more code and changes than adding one line of
>>>> MODULE_ALIAS.
>>>>
>>>>> Although it doesn't look like this driver has an SPI id table, you
>>>>> should probably add one, I be interested to see if this module is always
>>>>> being matched through the "spi" or the "of" alias..
>>>>
>>>> Could you please propose how that code should look like, so that I can test?
>>>>
>>>
>>> Sure,
>>>
>>> start with
>>> $ udevadm monitor
>>> and see what string the kernel is looking for when trying to find a
>>> module for this device.
>>
>> Well, the module is loaded automatically from DT at boot time well before
>> I can start udevadm. So that is the most tricky part to setup the system
>> to suppress this...
>>
>>>
>>> If it is only ever looking for "of:toppoly,td028ttec1", then you can
>>> drop the MODULE_ALIAS and be done as it was never getting used anyway.
>>
>> Since it is an SPI client, I am sure it looks for "spi:something.
>>
>>>
>>> What I expect though is "spi:toppoly,td028ttec1", in which case you
>>> should add
>>>
>>> static const struct spi_device_id td028ttec1_ids[] = {
>>> { "toppoly,td028ttec1", 0 },
>>> { "tpo,td028ttec1", 0},
>>> { /* sentinel */ }
>>> };
>>> MODULE_DEVICE_TABLE(spi, td028ttec1_ids);
>>
>> We already have a static const struct of_device_id td028ttec1_of_match[]
>> table with the same information.
>>
>> So we still have two places to keep in sync.
>>
>> Or can we remove the td028ttec1_of_match[]? AFAIK not.
>>
>>>
>>> link to it in the td028ttec1_spi_driver struct:
>>> .id_table = td028ttec1_ids,
>>>
>>> Then test again to see that the module still loads with the new and old
>>> DT string.
>>
>> In total I am not really convinced that adding 7 lines of code is better
>> than one (the "tpo," alias) that is tested and works...
>>
>> And it looks like a lot of unplanned code testing for me which takes more
>> than 5 minutes :)
>>
>> So I'd prefer to leave that exercise of fixing the MODULE_ALIAS/DEVICE_TABLE
>> to someone else...
>>
>
> That's fine, someday I'll probably get some script to do this for all
> the drivers that still have MODULE_ALIAS and an existing table.
That would be cool!
On a second thought, I think there is a quick experiment for this driver
not needing to monitor events.
1st attempt: remove ALIASES => if it still loads it would be fine
2nd attempt: add your id table => if it loads again, it is fine
if not, let's keep ALIASES.
Maybe I can try tomorrow.
BR and thanks,
Nikolaus
>
>> BR and thanks,
>> Nikolaus
>>
>>>
>>> Andrew
>>>
>>>> BR and thanks,
>>>> Nikolaus Schaller
>>>>
>>>>>
>>>>>>
>>>>>> Should I submit a new version?
>>>>>>
>>>>>> BR,
>>>>>> Nikolaus
>>>>>>
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>>>>
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>>
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