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Subject: Re: [PATCH v2] usb: host: ohci-at91: fix request of irq for optional
 gpio
To:     Tudor Ambarus - M18064 <Tudor.Ambarus@microchip.com>,
        "stern@rowland.harvard.edu" <stern@rowland.harvard.edu>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
        "Cristian Birsan - M91496" <Cristian.Birsan@microchip.com>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20181015090001.5195-1-tudor.ambarus@microchip.com>
From:   Nicolas Ferre <nicolas.ferre@microchip.com>
Organization: microchip
Message-ID: <40003ebc-2aee-d4fb-a813-68c1c92a9b7a@microchip.com>
Date:   Mon, 15 Oct 2018 11:12:18 +0200
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On 15/10/2018 at 11:00, Tudor Ambarus - M18064 wrote:
> atmel,oc-gpio is optional. Request its irq only when atmel,oc is set
> in device tree.
> 
> devm_gpiod_get_index_optional returns NULL if -ENOENT. Check its
> return value for NULL before error, because it is more probable that
> atmel,oc is not set.
> 
> This fixes the following errors on boards where atmel,oc is not set in
> device tree:
> [    0.960000] at91_ohci 500000.ohci: failed to request gpio "overcurrent" IRQ
> [    0.960000] at91_ohci 500000.ohci: failed to request gpio "overcurrent" IRQ
> [    0.970000] at91_ohci 500000.ohci: failed to request gpio "overcurrent" IRQ
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

As for v1 (patchwork friendly addition):
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>

Bye,
   Nicolas

> ---
> v2: fix typos in commit message s/it's/its, s/probably/probable
> 
> Based on https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git,
> usb-next branch.
> 
>   drivers/usb/host/ohci-at91.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
> index e98673954020..ec6739ef3129 100644
> --- a/drivers/usb/host/ohci-at91.c
> +++ b/drivers/usb/host/ohci-at91.c
> @@ -551,6 +551,8 @@ static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
>   		pdata->overcurrent_pin[i] =
>   			devm_gpiod_get_index_optional(&pdev->dev, "atmel,oc",
>   						      i, GPIOD_IN);
> +		if (!pdata->overcurrent_pin[i])
> +			continue;
>   		if (IS_ERR(pdata->overcurrent_pin[i])) {
>   			err = PTR_ERR(pdata->overcurrent_pin[i]);
>   			dev_err(&pdev->dev, "unable to claim gpio \"overcurrent\": %d\n", err);
> 


-- 
Nicolas Ferre