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Message-ID: <0181494e-58f2-2d22-78b2-e9399bf4552a@gmail.com>
Date:   Thu, 19 Jan 2023 16:32:15 -0500
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Subject: Re: [PATCH v2] drivers/mfd: simple-mfd-i2c: Add generic compatible
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To:     Lee Jones <lee@kernel.org>, Rob Herring <robh@kernel.org>
Cc:     linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
        lee.jones@linaro.org
References: <20221202113226.114465-1-Mr.Bossman075@gmail.com>
 <20230119175135.GA2085792-robh@kernel.org> <Y8mt6ZCMf4YZvDYA@google.com>
From:   Jesse Taube <mr.bossman075@gmail.com>
In-Reply-To: <Y8mt6ZCMf4YZvDYA@google.com>
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On 1/19/23 15:54, Lee Jones wrote:
> On Thu, 19 Jan 2023, Rob Herring wrote:
> 
>> On Fri, Dec 02, 2022 at 06:32:26AM -0500, Jesse Taube wrote:
>>> Some devices may want to use this driver without having a specific
>>> compatible string. Add a generic compatible string to allow this.
>>
>> What devices need this?
>>
>> Is that no specific compatible string at all or just in the kernel?
>> Because the former definitely goes against DT requirements. The latter
>> enables the former without a schema.
>>
>>>
>>> Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
>>> ---
>>>   drivers/mfd/simple-mfd-i2c.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
>>> index f4c8fc3ee463..0bda0dd9276e 100644
>>> --- a/drivers/mfd/simple-mfd-i2c.c
>>> +++ b/drivers/mfd/simple-mfd-i2c.c
>>> @@ -73,6 +73,7 @@ static const struct simple_mfd_data silergy_sy7636a = {
>>>   };
>>>   
>>>   static const struct of_device_id simple_mfd_i2c_of_match[] = {
>>> +	{ .compatible = "simple-mfd-i2c-generic" },
>>
>> Simple and generic? There is no such device. Anywhere.
>>
>> This is also not documented which is how I found it (make
>> dt_compatible_check).
I will write docs if needed.
But this should be reverted or dropped rather than
>> documented IMO.
Hi Rob, sorry for the disturbance. The reason I submitted this patch is 
this driver is generic and can be used by many different devices. Adding 
a generic compatible handle allows device tree writers avoid editing the 
  C source. I also will be submitting device trees that use this in the 
future if added.
Thanks,
Jesse Taube
> 
> I thought it would be better than having a huge list here.
> 
> Devices should *also* be allocated a specific compatible string.
> 
> $ git grep simple-mfd -- arch
>