linux-kernel - Re: [PATCH v4] gpio: Add support for Intel SoC PMIC (Crystal Cove)

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Date:	Tue, 27 May 2014 16:56:39 +0800
From:	"Zhu, Lejun" <lejun.zhu@...ux.intel.com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	Alexandre Courbot <gnurou@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	jacob.jun.pan@...ux.intel.com, bin.yang@...el.com
Subject: Re: [PATCH v4] gpio: Add support for Intel SoC PMIC (Crystal Cove)



On 5/27/2014 5:24 PM, Grygorii Strashko wrote:
> Hi Lejun,
> 
> On 05/27/2014 08:38 AM, Alexandre Courbot wrote:
>> On Fri, May 23, 2014 at 11:00 AM, Zhu, Lejun <lejun.zhu@...ux.intel.com> wrote:
>>> +static int crystalcove_gpio_probe(struct platform_device *pdev)
>>> +{
>>> +       int irq = platform_get_irq(pdev, 0);
> 
> Pls note, that platform_get_irq() may return error code.

Thank you. I'll fix it.

> 
> devm_gpiochip_add? ;)
> 

Huh? Can't find the API...

>>> +
>>> +       if (retval) {
>>> +               dev_warn(&pdev->dev, "request irq failed: %d\n", retval);
>>> +               goto out;
>>> +       }
>>> +
>>> +       retval = gpiochip_add(&cg->chip);
>>> +       if (retval) {
>>> +               dev_warn(&pdev->dev, "add gpio chip error: %d\n", retval);
>>> +               goto out_free_irq;
>>> +       }
> 
> As to my mind, It'll be better to setup IRQ as last probing step and
> free it as the first step of driver removing.

Mika suggested this order. Please see his mail for the reason. Is there
anything bad might happen if I setup IRQ first then do gpiochip_add?

Best Regards
Lejun
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