driver: i2s: i2s_silabs_siwx91x: Add pm device support for i2s driver

[fimohame]

This commit enables the pm device driver support for the i2s_silabs_siwx91x driver.

[Martinhoff-maker]

How do you test it ? I have tried to compile the i2s output sample with the PM config and it does not compile for me.

[fimohame]

I had created an test app locally which basically does i2s output with few overlay and prj.conf changes.

For the concern raised I have also validated with the i2s output test app,
find below the configurations i had used for reference

I2S pm changes requires the DMA PM commits: #94374

In overlay

/ {
	aliases {
		i2s-tx = &i2s0;
	};
};

&pinctrl0 {
	i2s0_default: i2s0_default {
		out {
			/* I2S0_CLK_HP25 - P25,  I2S0_DOUT0_HP28 - P31, I2S0_WS_HP26 - P27*/
			pinmux = <I2S0_CLK_HP25>, <I2S0_DOUT0_HP28>, <I2S0_WS_HP26>;
		};
		in {
			/* I2S0_DIN0_HP27 - P29 */
			pinmux = <I2S0_DIN0_HP27>;
		};
	};
};

&i2s0 {
	status = "okay";
	pinctrl-0 = <&i2s0_default>;
	pinctrl-names = "default";
	**zephyr,pm-device-runtime-auto;**
	dmas = <&dma0 15>, <&dma0 14>;
	dma-names = "tx", "rx";
};
&nwp {
    power-profile = "deep-sleep-with-ram-retention";
    status = "okay";
};
&dma0 {
	zephyr,pm-device-runtime-auto;
	status = "okay";
};

prj.conf

CONFIG_I2S=y
CONFIG_PM=y
CONFIG_PM_DEVICE=y
CONFIG_POWER_DOMAIN=y
CONFIG_NETWORKING=y
CONFIG_WIFI=y
CONFIG_I2S_SILABS_SIWX91X_TX_BLOCK_COUNT=20

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Martinhoff-maker]

feels ok now but needs to wait for the DMA PR to be merged in order to test it.