From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christian Jann <christian.jann@ymail.com>
Subject: Re: Need some help with auart on imx23
Date: Fri, 13 Sep 2013 21:28:58 +0200
Message-ID: <1523739.AE3jKYTuqA@thinkpad>
References: <3205717.NO7EKVN077@thinkpad> <1485573.VUJ6COcddm@thinkpad>
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On Tuesday 10 September 2013 19:58:01 you wrote:
> On Tuesday 10 September 2013 12:26:32 you wrote:
> > Hi, I could really need some help to get the second application uart
> > working on my imx23 based board.
> > 

So I've finally solved the issue after reading 
Documentation/devicetree/bindings/pinctrl/fsl,mxs-pinctrl.txt again, the 
pinmux-ids were wrong.

Required subnode-properties:
- fsl,pinmux-ids: An integer array.  Each integer in the array specify a pin
  with given mux function, with bank, pin and mux packed as below.

    [15..12] : bank number
    [11..4]  : pin number
    [3..0]   : mux selection

0000000000000000
[  ][      ][  ]
bank  pin    mux

0000000011100000 0x00e0 /* MX23_PAD_GPMI_D14__GPMI_D14 */
0000000011110000 0x00f0 /* MX23_PAD_GPMI_D15__GPMI_D15 */
  0b00001110 = 14
  0b00001111 = 15

Looking at the datasheet, mux for auart should be 01:

0000000011100001 0x00e1 /* MX23_PAD_GPMI_D14__AUART2_TX */
0000000011110001 0x00f1 /* MX23_PAD_GPMI_D15__AUART2_RX */


Before I haven't understood the exact functioning of fsl,pinmux-ids but now 
I've corrected arch/arm/boot/dts/imx23.dtsi:

auart1_2pins_a: auart1-2pins@0 {
  reg = <0>;
  fsl,pinmux-ids = <
    0x00e1 /* MX23_PAD_GPMI_D14__AUART2_TX */
    0x00f1 /* MX23_PAD_GPMI_D15__AUART2_RX */
  >;
  fsl,drive-strength = <0>;
  fsl,voltage = <1>;
  fsl,pull-up = <0>;
};

--
chris