drivers: mcux: flexio: Added generic MCUX FlexIO driver

[MikhailSiomin]

The driver has been tested on a mimxrt1064_evk board with 4 FlexIO SPI running at the same time.

prj.conf:

CONFIG_SPI=y
# CONFIG_SPI_ASYNC=y # supported
CONFIG_SPI_MCUX_FLEXIO=y

mimxrt1064_evk.overlay:

&pinctrl {
	pinmux_flexio3spi0: pinmux_flexio3spi0 {
		group0 {
			pinmux =
				<&iomuxc_gpio_ad_b0_09_gpio1_io09>, /* cs */
				<&iomuxc_gpio_ad_b0_10_gpio1_io10>, /* cs */
				<&iomuxc_gpio_ad_b1_10_flexio3_flexio10>, /* sck */
				<&iomuxc_gpio_ad_b1_11_flexio3_flexio11>, /* sdo */
				<&iomuxc_gpio_ad_b1_04_flexio3_flexio04>; /* sdi */
			drive-strength = "r0-6";
			slew-rate = "slow";
			nxp,speed = "150-mhz";
		};
	};
	pinmux_flexio3spi1: pinmux_flexio3spi1 {
		group0 {
			pinmux =
				<&iomuxc_gpio_ad_b0_02_gpio1_io02>, /* cs */
				<&iomuxc_gpio_ad_b0_03_gpio1_io03>, /* cs */
				<&iomuxc_gpio_ad_b1_05_flexio3_flexio05>, /* sck */
				<&iomuxc_gpio_ad_b1_01_flexio3_flexio01>, /* sdo */
				<&iomuxc_gpio_ad_b1_00_flexio3_flexio00>; /* sdi */
			drive-strength = "r0-6";
			slew-rate = "slow";
			nxp,speed = "150-mhz";
		};
	};
	pinmux_flexio3spi2: pinmux_flexio3spi2 {
		group0 {
			pinmux =
				<&iomuxc_gpio_ad_b0_11_gpio1_io11>, /* cs */
				<&iomuxc_gpio_ad_b1_07_flexio3_flexio07>, /* sck */
				<&iomuxc_gpio_ad_b1_06_flexio3_flexio06>, /* sdo */
				<&iomuxc_gpio_ad_b1_08_flexio3_flexio08>; /* sdi */
			drive-strength = "r0-6";
			slew-rate = "slow";
			nxp,speed = "150-mhz";
		};
	};
	pinmux_flexio3spi3: pinmux_flexio3spi3 {
		group0 {
			pinmux =
				<&iomuxc_gpio_ad_b1_00_gpio1_io16>, /* cs */
				<&iomuxc_gpio_ad_b1_02_flexio3_flexio02>, /* sck */
				<&iomuxc_gpio_ad_b1_03_flexio3_flexio03>, /* sdo */
				<&iomuxc_gpio_ad_b1_15_flexio3_flexio15>; /* sdi */
			drive-strength = "r0-6";
			slew-rate = "slow";
			nxp,speed = "150-mhz";
		};
	};
};

&flexio3 {
	status = "okay";
	flexio3_spi0: flexio3_spi0 {
		compatible = "nxp,imx-flexio-spi";
		status = "okay";
		#address-cells = <1>;
		#size-cells = <0>;
		cs-gpios = <&gpio1 9 GPIO_ACTIVE_LOW>,
				<&gpio1 10 GPIO_ACTIVE_LOW>;
		sdo-pin = <11>;
		sdi-pin = <4>; 
		sck-pin = <10>;
		pinctrl-0 = <&pinmux_flexio3spi0>;
		pinctrl-names = "default";
		flexio3_spi0_device0: flexio-spi-device@0 {
			compatible = "vnd,spi-device";
			status = "okay";
			reg = <0>;
			spi-max-frequency = <7500000>;
			frame-format = <0>;
		};
		flexio3_spi0_device1: flexio-spi-device@1 {
			compatible = "vnd,spi-device";
			status = "disabled";
			reg = <1>;
			spi-max-frequency = <100000>;
			frame-format = <0>;
		};
	};
	flexio3_spi1: flexio3_spi1 {
		compatible = "nxp,imx-flexio-spi";
		status = "okay";
		#address-cells = <1>;
		#size-cells = <0>;
		cs-gpios = <&gpio1 2 GPIO_ACTIVE_LOW>,
				<&gpio1 3 GPIO_ACTIVE_LOW>;
		sdo-pin = <1>;
		sdi-pin = <0>; 
		sck-pin = <5>;
		pinctrl-0 = <&pinmux_flexio3spi1>;
		pinctrl-names = "default";
		flexio3_spi1_device0: flexio-spi-device@0 {
			compatible = "vnd,spi-device";
			status = "disabled";
			reg = <0>;
			spi-max-frequency = <1000000>;
			frame-format = <0>;
		};
		flexio3_spi1_device1: flexio-spi-device@1 {
			compatible = "vnd,spi-device";
			status = "okay";
			reg = <1>;
			spi-max-frequency = <7500000>;
			frame-format = <0>;
		};
	};
	flexio3_spi2: flexio3_spi2 {
		compatible = "nxp,imx-flexio-spi";
		status = "okay";
		#address-cells = <1>;
		#size-cells = <0>;
		cs-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
		sdo-pin = <6>;
		sdi-pin = <8>; 
		sck-pin = <7>;
		pinctrl-0 = <&pinmux_flexio3spi2>;
		pinctrl-names = "default";
		flexio3_spi2_device0: flexio-spi-device@0 {
			compatible = "vnd,spi-device";
			status = "okay";
			reg = <0>;
			spi-max-frequency = <7500000>;
			frame-format = <0>;
		};
	};
	flexio3_spi3: flexio3_spi3 {
		compatible = "nxp,imx-flexio-spi";
		status = "okay";
		#address-cells = <1>;
		#size-cells = <0>;
		cs-gpios = <&gpio1 16 GPIO_ACTIVE_LOW>;
		sdo-pin = <3>;
		sdi-pin = <15>; 
		sck-pin = <2>;
		pinctrl-0 = <&pinmux_flexio3spi3>;
		pinctrl-names = "default";
		flexio3_spi3_device0: flexio-spi-device@0 {
			compatible = "vnd,spi-device";
			status = "okay";
			reg = <0>;
			spi-max-frequency = <7500000>;
			frame-format = <0>;
		};
	};
};

&lpspi3 {
	status = "disabled";
};

Signed-off-by: Mikhail Siomin victorovich.01@mail.ru

[MikhailSiomin]

The driver will not pass the tests until the drivers of HAL are enabled (zephyrproject-rtos/hal_nxp#205).
Also, the driver will not pass the tests if they are run on the board, because tests expect SPI dummy data to be 0x00 (zephyrproject-rtos/hal_nxp#223).
You can run the driver tests yourself with the following command (the serial port may be different):
python.exe .\scripts\twister -vvv --short-build-path --tag flexio -p mimxrt1064_evk -T tests/drivers/spi/spi_loopback --device-testing --device-serial COM4 -X spi_loopback

[mmahadevan108]

Is this missing default y

[MikhailSiomin]

@danieldegrasse, Is it worth making this amendment to this PR?

[danieldegrasse]

Yes- thank you for adding it. We should change the dependency here to be on DT_HAS_NXP_FLEXIO_SPI_ENABLED though

[mmahadevan108]

Not needed if we default y the driver Kconfig

[danieldegrasse]

@MikhailSiomin can you take a look at the twister failures?

[MikhailSiomin]

@danieldegrasse, It seems to me that failed tests are not related to changes in the PR.

[MikhailSiomin]

Resolved merge conflicts.

[mmahadevan108]

@MikhailSiomin , thank your contribution. The HAL PR has been merged. Can you please update the Zephyr side.

[MikhailSiomin]

Thank you all for the work done on the PR.