Re: [PATCH 3/3] ARM: at91: dt: at91sam9n12ek: enable udp

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Hi Sylvain,

On 02/09/2015 06:04 PM, Sylvain Rochet wrote:
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@xxxxxxxxx>
---

  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 */
		};
	};
};

Thanks.

I will add it in next version.


Sylvain


Best Regards,
Bo Shen

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