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From: Roy Im <roy.im.opensource@diasemi.com>
To: Randy Dunlap <rdunlap@infradead.org>,
	Roy Im <roy.im.opensource@diasemi.com>,
	Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Brian Masney <masneyb@onstation.org>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Lee Jones <lee.jones@linaro.org>, Luca Weiss <luca@z3ntu.xyz>,
	Maximilian Luz <luzmaximilian@gmail.com>,
	Pascal PAILLET-LME <p.paillet@st.com>,
	Rob Herring <robh@kernel.org>,
	Samuel Ortiz <sameo@linux.intel.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: Support Opensource <Support.Opensource@diasemi.com>,
	"linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>
Subject: RE: [PATCH V17 3/3] Input: new da7280 haptic driver
Date: Fri, 24 Jul 2020 05:47:04 +0000	[thread overview]
Message-ID: <DB8PR10MB343624BF003338E8B34439AC85770@DB8PR10MB3436.EURPRD10.PROD.OUTLOOK.COM> (raw)
Message-ID: <20200724054704.kGAFDuUE_JHZos4IsiXaRh-QfhcN20u8_xliWdLcLWU@z> (raw)
In-Reply-To: <f549102d-4e69-c903-1672-f50bdb7994a3@infradead.org>

Friday, July 24, 2020 11:57 AM, Randy Dunlap wrote 
> On 7/23/20 6:54 PM, Roy Im wrote:
> > On Fri, July 24, 2020 5:51 AM, Randy Dunlap wrote
> >> On 7/23/20 8:01 AM, Roy Im wrote:
> >>> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> >>> index 362e8a0..06dc5a3 100644
> >>> --- a/drivers/input/misc/Kconfig
> >>> +++ b/drivers/input/misc/Kconfig
> >>> @@ -869,4 +869,17 @@ config INPUT_STPMIC1_ONKEY
> >>>  	  To compile this driver as a module, choose M here: the
> >>>  	  module will be called stpmic1_onkey.
> >>>
> >>> +config INPUT_DA7280_HAPTICS
> >>> +	tristate "Dialog Semiconductor DA7280 haptics support"
> >>> +	depends on INPUT && I2C
> >>> +	select INPUT_FF_MEMLESS
> >>> +	select REGMAP_I2C
> >>> +	help
> >>> +	  Say Y to enable support for the Dialog DA7280 haptics driver.
> >>> +	  The haptics can be controlled by I2C communication,
> >>> +	  or by PWM input, or by GPI.
> >>
> >> 	  Is that                GPIO.
> >> ?
> > The Haptics can be working by GPI(if see from the haptic device), but from the Host it is GPO. Do you think the GPIO is
> correct?
> 
> To me it needs to represent what services/interfaces/facilities are used by this driver that are provided by the Linux kernel.
> If it uses Linux GPIO services, then it should say GPIO -- although I don't see it using any Linux GPIO services.

OK, let me change to GPIO.

> 
> >>
> >> Can the haptics be controlled only by PWM or only by GPI(O)?
> >>
> >> Just curious: why is I2C required to build the driver if a user is only controlling the device by PWM or GPI?
> >
> > I2C is required to control registers and it can be triggered by I2C or PWM or GPI(controlled by host outside this driver),
> so PWM and GPI are optional.
> > With your comments, I think it's better to remove below lines(//remove) to avoid confusion and add PWM as below if
> you agree.
> >          // remove
> > 	  The haptics can be controlled by I2C communication,
> > 	  or by PWM input, or by GPI.
> >          // update, adding || PWM
> >          depends on (INPUT && I2C) || PWM
> 
> Since <linux/pwm.h> provides stubs for when CONFIG_PWM is not enabled, it appears that "depends on  PWM" is not
> required.
> 
> I'll leave it up to you. I was just trying to understand better.
> It may be that no changes are needed.

OK, thanks for your comments. To be clearer, I would like to update as below if you agree
	
	depends on INPUT && I2C
...
	The haptics can be controlled by PWM or GPIO
	with I2C communication.
> 
> 
> thanks.
> --
> ~Randy

Kind regards,
Roy

  reply	other threads:[~2020-07-24  5:47 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <cover.1595516501.git.Roy.Im@diasemi.com>
2020-07-23 15:01 ` [PATCH V17 3/3] Input: new da7280 haptic driver Roy Im
2020-07-23 20:50   ` Randy Dunlap
2020-07-24  1:54     ` Roy Im
2020-07-24  2:56       ` Randy Dunlap
2020-07-24  5:47         ` Roy Im [this message]
2020-07-24  5:47           ` Roy Im
2020-07-24  5:48           ` Randy Dunlap
2020-07-24  5:48             ` Randy Dunlap
2020-07-23 20:55   ` Randy Dunlap
2020-07-24  2:06     ` Roy Im

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