dts: rt685: enabled flexcomm15

the RT685 contains an additional flexcomm peripheral, that supports
only I2C. This commit adds this peripheral to the device tree,
and enables pins and clocks for flexcomm15.

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

boards/arm/mimxrt685_evk/pinmux.c

@@ -961,6 +961,50 @@ static int mimxrt685_evk_pinmux_init(const struct device *dev)
 	IOPCTL_PinMuxSet(IOPCTL, 2U, 9U, port2_pin9_config);
 #endif
 
+#if DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(pmic_i2c), nxp_lpc_i2c, okay)  && CONFIG_I2C
+	const uint32_t fc15_i2c_scl_config = (/* Pin is configured as I2C_SCL */
+		IOPCTL_PIO_FUNC0 |
+		/* Enable pull-up / pull-down function */
+		IOPCTL_PIO_PUPD_EN |
+		/* Enable pull-up function */
+		IOPCTL_PIO_PULLUP_EN |
+		/* Enables input buffer function */
+		IOPCTL_PIO_INBUF_EN |
+		/* Normal mode */
+		IOPCTL_PIO_SLEW_RATE_NORMAL |
+		/* Normal drive */
+		IOPCTL_PIO_FULLDRIVE_DI |
+		/* Analog mux is disabled */
+		IOPCTL_PIO_ANAMUX_DI |
+		/* Pseudo Output Drain is enabled */
+		IOPCTL_PIO_PSEDRAIN_EN |
+		/* Input function is not inverted */
+		IOPCTL_PIO_INV_DI);
+	/* FC15_SCL PIN (coords: E16) is configured as I2C SCL */
+	IOPCTL->FC15_I2C_SCL = fc15_i2c_scl_config;
+
+	const uint32_t fc15_i2c_sda_config = (/* Pin is configured as I2C_SDA */
+		IOPCTL_PIO_FUNC0 |
+		/* Enable pull-up / pull-down function */
+		IOPCTL_PIO_PUPD_EN |
+		/* Enable pull-up function */
+		IOPCTL_PIO_PULLUP_EN |
+		/* Enables input buffer function */
+		IOPCTL_PIO_INBUF_EN |
+		/* Normal mode */
+		IOPCTL_PIO_SLEW_RATE_NORMAL |
+		/* Normal drive */
+		IOPCTL_PIO_FULLDRIVE_DI |
+		/* Analog mux is disabled */
+		IOPCTL_PIO_ANAMUX_DI |
+		/* Pseudo Output Drain is enabled */
+		IOPCTL_PIO_PSEDRAIN_EN |
+		/* Input function is not inverted */
+		IOPCTL_PIO_INV_DI);
+	/* FC15_SDA PIN (coords: F16) is configured as I2C SDA */
+	IOPCTL->FC15_I2C_SDA = fc15_i2c_sda_config;
+#endif
+
 #if DT_NODE_HAS_STATUS(DT_NODELABEL(lpadc0), okay) && CONFIG_ADC
 	/*
 	 * The current test and sample applications uses a single channel for

drivers/clock_control/clock_control_mcux_syscon.c

@@ -64,6 +64,9 @@ static int mcux_lpc_syscon_clock_control_get_subsys_rate(
 	case MCUX_FLEXCOMM7_CLK:
 		*rate = CLOCK_GetFlexCommClkFreq(7);
 		break;
+	case MCUX_PMIC_I2C_CLK:
+		*rate = CLOCK_GetFlexCommClkFreq(15);
+		break;
 	case MCUX_HS_SPI_CLK:
 #if defined(FSL_FEATURE_FLEXCOMM8_SPI_INDEX)
 		*rate = CLOCK_GetHsLspiClkFreq();

dts/arm/nxp/nxp_rt6xx_common.dtsi

@@ -189,6 +189,15 @@
 		status = "disabled";
 	};
 
+	pmic_i2c: i2c@127000 {
+		compatible = "nxp,lpc-i2c";
+		reg = <0x127000 0x1000>;
+		interrupts = <21 0>;
+		label = "PMIC_I2C";
+		clocks = <&clkctl1 MCUX_PMIC_I2C_CLK>;
+		status = "disabled";
+	};
+
 	usbhs: usbhs@144000 {
 		compatible = "nxp,mcux-usbd";
 		reg = <0x144000 0x1000>;

include/dt-bindings/clock/mcux_lpc_syscon_clock.h

@@ -15,6 +15,7 @@
 #define MCUX_FLEXCOMM5_CLK		5
 #define MCUX_FLEXCOMM6_CLK		6
 #define MCUX_FLEXCOMM7_CLK		7
+#define MCUX_PMIC_I2C_CLK		16
 #define MCUX_HS_SPI_CLK		8
 #define MCUX_USDHC1_CLK		9
 #define MCUX_USDHC2_CLK		10

soc/arm/nxp_imx/rt6xx/soc.c

@@ -235,6 +235,10 @@ static ALWAYS_INLINE void clock_init(void)
 	CLOCK_AttachClk(kSFRO_to_FLEXCOMM2);
 #endif
 
+#if DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(pmic_i2c), nxp_lpc_i2c, okay)
+	CLOCK_AttachClk(kFFRO_to_FLEXCOMM15);
+#endif
+
 #if DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(flexcomm4), nxp_lpc_usart, okay)
 	CLOCK_AttachClk(kSFRO_to_FLEXCOMM4);
 #endif