linux-kernel - Re: [PATCH 3/5] mfd: tps65217: Add a dependency on OF

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Date:   Wed, 7 Jun 2017 15:37:10 +0200
From:   Enric Balletbo Serra <eballetbo@...il.com>
To:     Keerthy <j-keerthy@...com>
Cc:     Lee Jones <lee.jones@...aro.org>, Tony Lindgren <tony@...mide.com>,
        milo.kim@...com,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] mfd: tps65217: Add a dependency on OF

2017-06-07 13:24 GMT+02:00 Keerthy <j-keerthy@...com>:
>
>
> On Wednesday 07 June 2017 04:08 PM, Lee Jones wrote:
>> On Wed, 07 Jun 2017, Lee Jones wrote:
>>
>>> On Wed, 07 Jun 2017, Keerthy wrote:
>>>
>>>>
>>>>
>>>> On Tuesday 06 June 2017 08:34 PM, Enric Balletbo Serra wrote:
>>>>> Hi Keerthy,
>>>>>
>>>>> By change I was looking at this. Some comments below that I think can
>>>>> be applied to all patches in this series
>>>>>
>>>>> 2017-06-06 16:45 GMT+02:00 Keerthy <j-keerthy@...com>:
>>>>>> Currently the driver boots only via device tree hence add a
>>>>>> dependency on OF.
>>>>>>
>>>>>> Signed-off-by: Keerthy <j-keerthy@...com>
>>>>>> ---
>>>>>>  drivers/mfd/Kconfig | 2 +-
>>>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>>
>>>>>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>>>>>> index 75b59f1..2d1425d 100644
>>>>>> --- a/drivers/mfd/Kconfig
>>>>>> +++ b/drivers/mfd/Kconfig
>>>>>> @@ -1297,7 +1297,7 @@ config MFD_TPS65090
>>>>>>
>>>>>>  config MFD_TPS65217
>>>>>>         tristate "TI TPS65217 Power Management / White LED chips"
>>>>>> -       depends on I2C
>>>>>> +       depends on I2C && OF
>>>>>
>>>>> Shouldn't you add || COMPILE_TEST here ?
>>>>
>>>> Sure.
>>>>
>>>>>
>>>>>>         select MFD_CORE
>>>>>>         select REGMAP_I2C
>>>>>>         select IRQ_DOMAIN
>>>>>>
>>>>>
>>>>> I think you can remove the of_match_device checks in some drivers too
>>>>>
>>>>> i.e:
>>>>>
>>>>> http://elixir.free-electrons.com/linux/latest/source/drivers/mfd/tps65217.c#L330
>>>>
>>>> Yes that and removal of unused i2c_device_id. I will follow it up once
>>>> this OF dependency is in.
>>>
>>> The of_match_device() checks should be removed with the OF patch.
>
> Lee Jones/ Enric,
>
> IIUC of_match_device call is still needed to obtain a match and in case
> there are multiple compatibles with different match data then this call
> is definitely needed.
>

Not sure if I follow you. My understanding is that with DT the probe
of this driver is only called if there is a node with the compatible =
"ti,tps65217" string. So if probe is called there is always a match
and the call to of_match_device is redundant.

> There is no need to check for return value as we will find one match for
> sure and that can be removed.
>
> Even checks like 'if (client->dev.of_node) {' can surely be removed with
> depends on OF.
>

Yes I think this should be removed too.

> Please correct me if i am wrong.
>
> Regards,
> Keerthy
>>
>> In fact, just squash these changes into the I2C removal patches.
>>

Regards,
 Enric