[nrf fromtree] drivers: i2s_nrfx: Generate master clock if pin is con…

…nected

The driver uses pinctrl to configure pins instead of nrfx I2S API.
Check whether MCK pin was actually connected by pinctrl instead of
comparing nrfx_cfg.mck_pin that is always NRF_I2S_PIN_NOT_CONNECTED.

This makes it possible for nRF I2S to provide master clock even when
operating in I2S Slave mode.

Signed-off-by: Tomasz Moń <[email protected]>
(cherry picked from commit 76e12a3)

drivers/i2s/i2s_nrfx.c

@@ -501,7 +501,8 @@ static int i2s_nrfx_configure(const struct device *dev, enum i2s_dir dir,
 	 * the MCK output is used), find a suitable clock configuration for it.
 	 */
 	if (nrfx_cfg.mode == NRF_I2S_MODE_MASTER ||
-	    nrfx_cfg.mck_pin != NRF_I2S_PIN_NOT_CONNECTED) {
+	    (nrf_i2s_mck_pin_get(drv_cfg->i2s.p_reg) & I2S_PSEL_MCK_CONNECT_Msk)
+	    == I2S_PSEL_MCK_CONNECT_Connected << I2S_PSEL_MCK_CONNECT_Pos) {
 		find_suitable_clock(drv_cfg, &nrfx_cfg, i2s_cfg);
 		/* Unless the PCLK32M source is used with the HFINT oscillator
 		 * (which is always available without any additional actions),