linux-kernel - Re: [Patch v2] AM35xx: Craneboard: Add USB EHCI support

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Message-ID: <87oc9hutru.fsf@deeprootsystems.com>
Date:	Mon, 22 Nov 2010 09:56:21 -0800
From:	Kevin Hilman <khilman@...prootsystems.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, nm@...com,
	nagendra@...tralsolutions.com, umeshk@...tralsolutions.com,
	sshtylyov@...sta.com
Subject: Re: [Patch v2] AM35xx: Craneboard: Add USB EHCI support

srinath@...tralsolutions.com writes:

> 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.
>
> Signed-off-by: Srinath <srinath@...tralsolutions.com>
> ---
>  arch/arm/mach-omap2/board-am3517crane.c |   20 ++++++++++++++++++++
>  1 files changed, 20 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/board-am3517crane.c b/arch/arm/mach-omap2/board-am3517crane.c
> index 13ead33..91791bc 100644
> --- a/arch/arm/mach-omap2/board-am3517crane.c
> +++ b/arch/arm/mach-omap2/board-am3517crane.c
> @@ -28,8 +28,10 @@
>  
>  #include <plat/board.h>
>  #include <plat/common.h>
> +#include <plat/usb.h>
>  
>  #include "mux.h"
> +#include "control.h"
>  
>  /* Board initialization */
>  static struct omap_board_config_kernel am3517_crane_config[] __initdata = {
> @@ -53,10 +55,28 @@ static void __init am3517_crane_init_irq(void)
>  	omap_gpio_init();
>  }
>>  
> +static struct ehci_hcd_omap_platform_data ehci_pdata __initdata = {
> +	.port_mode[0] = EHCI_HCD_OMAP_MODE_PHY,
> +	.port_mode[1] = EHCI_HCD_OMAP_MODE_UNKNOWN,
> +	.port_mode[2] = EHCI_HCD_OMAP_MODE_UNKNOWN,
> +
> +	.phy_reset  = true,
> +	.reset_gpio_port[0]  = 38,
> +	.reset_gpio_port[1]  = -EINVAL,
> +	.reset_gpio_port[2]  = -EINVAL
> +};
> +
>  static void __init am3517_crane_init(void)
>  {
>  	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
>  	omap_serial_init();
> +
> +	/* Configure GPIO for EHCI port */
> +	omap_mux_init_gpio(35, OMAP_PIN_OUTPUT);

Please define a symbolic constant for these GPIO numbers instead of using
hard-coded constants.

> +	gpio_request(35, "usb_ehci_enable");

GPIO APIs can fail.  Please check return value and act accordingly.

> +	gpio_direction_output(35, 1);
> +	omap_mux_init_gpio(38, OMAP_PIN_OUTPUT);
> +	usb_ehci_init(&ehci_pdata);
>  }
>  
>  MACHINE_START(CRANEBOARD, "AM3517/05 CRANEBOARD")

Kevin
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