linux-kernel - RE: [PATCH v2 4/8] input: goodix: reset device at init

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Date:	Tue, 23 Jun 2015 13:20:39 +0000
From:	"Tirdea, Irina" <irina.tirdea@...el.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Bastien Nocera <hadess@...ess.net>,
	Mark Rutland <mark.rutland@....com>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Purdila, Octavian" <octavian.purdila@...el.com>
Subject: RE: [PATCH v2 4/8] input: goodix: reset device at init



> -----Original Message-----
> From: linux-input-owner@...r.kernel.org [mailto:linux-input-owner@...r.kernel.org] On Behalf Of Dmitry Torokhov
> Sent: 09 June, 2015 20:58
> To: Tirdea, Irina
> Cc: Bastien Nocera; Mark Rutland; linux-input@...r.kernel.org; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Rob
> Herring; Pawel Moll; Ian Campbell; Kumar Gala; Purdila, Octavian
> Subject: Re: [PATCH v2 4/8] input: goodix: reset device at init
> 
> Hi Irina,
> 
> On Mon, Jun 08, 2015 at 05:37:49PM +0300, Irina Tirdea wrote:
> > +static int goodix_get_gpio_config(struct goodix_ts_data *ts)
> > +{
> > +	struct device *dev;
> > +	struct gpio_desc *gpiod;
> > +	int ret;
> > +
> > +	if (!ts->client)
> > +		return -EINVAL;
> > +	dev = &ts->client->dev;
> > +
> > +	/* Get interrupt GPIO pin number */
> > +	gpiod = devm_gpiod_get(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
> > +	if (IS_ERR(gpiod)) {
> > +		ret = PTR_ERR(gpiod);
> > +		dev_err(dev, "Failed to get %s GPIO: %d\n",
> > +			GOODIX_GPIO_INT_NAME, ret);
> 
> You need to handle -EPROBE_DEFER (suppress error) and especially -ENOENT error
> codes, otherwise, as Bastien mentioned, you will break existing DTS.
> 

Yes, I will handle the -EPROBE_DEFER and -ENOENT for devices that might not have these
gpio pins connected or declared in ACPI/DTS. Since the following patches depend on these
pins, I will bypass the functionality for these devices (suspend/resume, esd, writing config
will not be available if gpio pins are not found).

Thanks,
Irina

> Thanks.
> 
> --
> Dmitry
> --
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