Hi again,

Just after the posting I've found the source of reported error.

The Angstrom DTS file contains following pinctrl request in the DTS for 
HDMI audio.

0x1a8 0x1f  /* mcasp0_axr1 GPIO1_27 | OUTPUT | PULLUP */
mcasp_clock_enable = <&gpio2 27 0>; /* BeagleBone Black Clk enable on 
GPIO1_27 */

It is false, because clock control is on gpio3[21].

Correct configuration register should be different:

0x06c 0x17      /*  gpmc_a11.gpio3_21,        MUX_MODE7 | PIN_OUTPUT */

I've been using this without checking.

After fixing this, the AXR1 output is correctly generated (and not 
overriden by later request in the same pinctrl-single line.

Miero

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