linux-kernel - Re: [PATCH 3/4] mfd: omap-usb-host: Use gpio_request

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Date:	Thu, 01 Dec 2011 10:02:09 +0200
From:	Igor Grinberg <grinberg@...pulab.co.il>
To:	Axel Lin <axel.lin@...il.com>
CC:	linux-kernel@...r.kernel.org,
	Keshava Munegowda <keshava_mgowda@...com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 3/4] mfd: omap-usb-host: Use gpio_request_one

Hi Axel,

On 12/01/11 03:53, Axel Lin wrote:
> Use gpio_request_one() instead of multiple gpiolib calls.
> 
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/mfd/omap-usb-host.c |   20 +++++++-------------
>  1 files changed, 7 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index 86e1458..6533ecc 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -715,19 +715,13 @@ static int usbhs_enable(struct device *dev)
>  	clk_enable(omap->usbtll_ick);
>  
>  	if (pdata->ehci_data->phy_reset) {
> -		if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0])) {
> -			gpio_request(pdata->ehci_data->reset_gpio_port[0],
> -						"USB1 PHY reset");
> -			gpio_direction_output
> -				(pdata->ehci_data->reset_gpio_port[0], 0);
> -		}
> +		if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0]))
> +			gpio_request_one(pdata->ehci_data->reset_gpio_port[0],
> +					 GPIOF_OUT_INIT_LOW, "USB1 PHY reset");
>  
> -		if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1])) {
> -			gpio_request(pdata->ehci_data->reset_gpio_port[1],
> -						"USB2 PHY reset");
> -			gpio_direction_output
> -				(pdata->ehci_data->reset_gpio_port[1], 0);
> -		}
> +		if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1]))
> +			gpio_request_one(pdata->ehci_data->reset_gpio_port[1],
> +					 GPIOF_OUT_INIT_LOW, "USB2 PHY reset");

I was wondering, if we need the gpio_is_valid() check here and above?
gpio_request() already does the gpio_is_valid() check,
so why should we double check?


-- 
Regards,
Igor.
--
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