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boards: mimxrt685_evk/mimxrt685s/cm33: Enable DMIC

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Enable DMIC clock in soc.c - attach to chip's audio PLL. Add pinmux
definitions for the DMIC peripheral. Add nodes to SoC's device tree for
the DMIC peripheral and its audio channels. Configure the DMIC
peripheral in board's device tree to enable audio capture.

Signed-off-by: Vit Stanicek <vit.stanicek@nxp.com>
This commit is contained in:
Vit Stanicek 2024-08-05 10:40:04 +02:00 • committed by Carles Cufí
commit b8466e0c95
4 changed files with 114 additions and 1 deletions
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12
soc/nxp/imxrt/imxrt6xx/cm33/soc.c
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@ -310,6 +310,18 @@ static ALWAYS_INLINE void clock_init(void)
CLOCK_SetClkDiv(kCLOCK_DivAdcClk, DT_PROP(DT_NODELABEL(lpadc0), clk_divider));
#endif
#if DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(dmic0), nxp_dmic, okay)
/* Using the Audio PLL as input clock leads to better clock dividers
* for typical PCM sample rates ({8,16,24,32,48,96} kHz.
*/
/* DMIC source from audio pll, divider 8, 24.576M/8=3.072MHZ
* Select Audio PLL as clock source. This should produce a bit clock
* of 3.072MHZ
*/
CLOCK_AttachClk(kAUDIO_PLL_to_DMIC_CLK);
CLOCK_SetClkDiv(kCLOCK_DivDmicClk, 8);
#endif
#ifdef CONFIG_FLASH_MCUX_FLEXSPI_XIP
/*
* Call function flexspi_setup_clock() to set user configured clock source/divider