linux-kernel - Re: [Patch v3] AM35xx: Craneboard: Add USB EHCI support

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Date:	Thu, 2 Dec 2010 11:55:40 +0530
From:	"G, Manjunath Kondaiah" <manjugk@...com>
To:	srinath@...tralsolutions.com
Cc:	linux-omap@...r.kernel.org, jdk@...com, tony@...mide.com,
	linux-kernel@...r.kernel.org, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, khilman@...prootsystems.com,
	nm@...com, nagendra@...tralsolutions.com,
	umeshk@...tralsolutions.com
Subject: Re: [Patch v3] AM35xx: Craneboard: Add USB EHCI support

* srinath@...tralsolutions.com <srinath@...tralsolutions.com> [2010-12-01 22:28:50 +0530]:

> From: Srinath <srinath@...tralsolutions.com>
> 
> AM3517/05 Craneboard has one EHCI interface on board using port1.
> 
> GPIO35 is used as power enable.
> GPIO38 is used as port1 PHY reset.
> 
> History:
> http://marc.info/?l=linux-omap&w=2&r=1&s=Craneboard%3A+Add+USB+EHCI+support&q=t
> 
> Signed-off-by: Srinath <srinath@...tralsolutions.com>
> ---
>  arch/arm/mach-omap2/board-am3517crane.c |   40 +++++++++++++++++++++++++++++++
>  1 files changed, 40 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/board-am3517crane.c b/arch/arm/mach-omap2/board-am3517crane.c
> index 13ead33..6fd5dfe 100644
> --- a/arch/arm/mach-omap2/board-am3517crane.c
> +++ b/arch/arm/mach-omap2/board-am3517crane.c
> @@ -28,8 +28,13 @@
>  
[...]
>  static void __init am3517_crane_init(void)
>  {
> +	int ret;
> +
>  	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
>  	omap_serial_init();
> +
> +	/* Configure GPIO for EHCI port */
> +	omap_mux_init_gpio(GPIO_USB_POWER, OMAP_PIN_OUTPUT);

This is non void function. You can consider return value for further
processing.

> +
> +	ret = gpio_request(GPIO_USB_POWER, "usb_ehci_enable");
> +	if (ret < 0) {
> +		pr_err("Cannot request GPIO %d\n", GPIO_USB_POWER);
> +		return;
> +	}
> +
> +	ret = gpio_direction_output(GPIO_USB_POWER, 1);
> +	if (ret < 0)
> +		goto err;
> +
> +	omap_mux_init_gpio(GPIO_USB_NRESET, OMAP_PIN_OUTPUT);

-Ditto-

Also, why there is no gpio_request for "GPIO_USB_NRESET"

-Manjunath

[...]
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