lkml.org 
[lkml]   [2015]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/3] ARM: at91: dt: at91sam9n12ek: enable udp
Hello Bo,

On Mon, Feb 09, 2015 at 05:02:52PM +0800, Bo Shen wrote:
> Enable usb device port on at91sam9n12ek board.
>
> Signed-off-by: Bo Shen <voice.shen@atmel.com>
> ---
>
> arch/arm/boot/dts/at91sam9n12ek.dts | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/boot/dts/at91sam9n12ek.dts b/arch/arm/boot/dts/at91sam9n12ek.dts
> index 13bb24e..3e572e5 100644
> --- a/arch/arm/boot/dts/at91sam9n12ek.dts
> +++ b/arch/arm/boot/dts/at91sam9n12ek.dts
> @@ -120,6 +120,11 @@
> };
> };
>
> + usb1: gadget@f803c000 {
> + atmel,vbus-gpio = <&pioB 16 GPIO_ACTIVE_HIGH>;
> + status = "okay";
> + };
> +

There is an external resistor divider on PB16, acting like a pull-down
(R22+R23). PB16 reset state is input, pull-up, schmitt trigger, you need
to disable the pull-up in pinctrl this way:

usb1: gadget@f803c000 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_board_usb1>;

}

pinctrl … {
usb1 {
pinctrl_board_usb1: usb1-board {
atmel,pins = <AT91_PIOB 16 AT91_PERIPH_GPIO AT91_PINCTRL_DEGLITCH>; /* PB16, no pull up and deglitch */
};
};
};


Sylvain


\
 
 \ /
  Last update: 2015-02-09 12:21    [W:0.059 / U:0.460 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site