linux-kernel - Re: [PATCH v3 6/6] gpio: tps65086: Add GPIO driver for the TPS65086 PMIC

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Message-ID: <CACRpkdYfKXDto0TAyW8L+noomPmfTqV+SekdtFXuAsf_Xe3Bkw@mail.gmail.com>
Date:	Wed, 18 Nov 2015 10:44:37 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	"Andrew F. Davis" <afd@...com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6/6] gpio: tps65086: Add GPIO driver for the TPS65086 PMIC

On Tue, Nov 17, 2015 at 5:11 PM, Andrew F. Davis <afd@...com> wrote:
> On 11/17/2015 03:17 AM, Linus Walleij wrote:
>>
>> On Wed, Nov 4, 2015 at 6:12 PM, Andrew F. Davis <afd@...com> wrote:
>>
>>> Add support for the TPS65086 PMIC GPOs.
>>>
>>> TPS65086 has four configurable GPOs that can be used for several
>>> purposes.
>>>
>>> Signed-off-by: Andrew F. Davis <afd@...com>
>>
>>
>> OK...
>>
>>> +static int tps65086_gpio_get(struct gpio_chip *gc, unsigned offset)
>>> +static void tps65086_gpio_set(struct gpio_chip *gc, unsigned offset,
>>
>>
>> Just get/set and no get_direction/direction_input/direction_output?
>> Are you sure?
>>
>
> Yeah, these are output only, I could probably add get_direction and just
> always return output, but setters wouldn't make sense here.

It's important that you note in the driver, commit blurb and maybe even
Kconfig that these GPIOs are output-only. Someone could get confused.

You should implement .direction_output() and return 0, and implement
.direction_input and return negative error code. As it is now, it will
seem like input is working, while it's not, right?

Yours,
Linus Walleij
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