linux-kernel - Re: [PATCH v4 6/6] leds: lm36274: Introduce the TI LM36274 LED driver

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Date:   Tue, 21 May 2019 19:40:55 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, pavel@....cz
Cc:     lee.jones@...aro.org, rdunlap@...radead.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 6/6] leds: lm36274: Introduce the TI LM36274 LED driver

On 5/20/19 11:19 PM, Dan Murphy wrote:
> Jacek
> 
> On 5/20/19 2:54 PM, Jacek Anaszewski wrote:
>> Hi Dan,
>>
>> On 5/7/19 10:11 PM, Dan Murphy wrote:
>>> Introduce the LM36274 LED driver.  This driver uses the ti-lmu
>>> MFD driver to probe this LED driver.  The driver configures only the
>>> LED registers and enables the outputs according to the config file.
>>>
>>> The driver utilizes the TI LMU (Lighting Management Unit) LED common
>>> framework to set the brightness bits.
>>>
>>> Signed-off-by: Dan Murphy <dmurphy@...com>
>>> ---
>>>    drivers/leds/Kconfig        |   7 ++
>>>    drivers/leds/Makefile       |   1 +
>>>    drivers/leds/leds-lm36274.c | 174 ++++++++++++++++++++++++++++++++++++
>>>    3 files changed, 182 insertions(+)
>>>    create mode 100644 drivers/leds/leds-lm36274.c
>>>
>>> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
>>> index 255fdd5e8491..db83a3feca01 100644
>>> --- a/drivers/leds/Kconfig
>>> +++ b/drivers/leds/Kconfig
>>> @@ -791,6 +791,13 @@ config LEDS_LM3697
>>>          Say Y to enable the LM3697 LED driver for TI LMU devices.
>>>          This supports the LED device LM3697.
>>>    +config LEDS_LM36274
>>> +    tristate "LED driver for LM36274"
>>> +    depends on LEDS_TI_LMU_COMMON
>>
>> Shouldn't we have "depends on MFD_TI_LMU" as well here?
>>
> 
> Actually the LEDS_TI_LMU_COMMON flag should depend on MFD_TI_LMU.
> Then it would inherit that dependency.

LEDS_TI_LMU_COMMON does not seem too have any dependency on MFD_TI_LMU,
and it would be incorrect to require enabling MFD_TI_LMU for all drivers
depending on TI_LMU_COMMON, that can be probed on their own, like
leds-lm3697.c .

-- 
Best regards,
Jacek Anaszewski