Can't enable 2nd SPI controller on iMX7 1G, but works on i MX7 512M

Technical Support
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1

Hi. We have an application where we are using ecspi3 and ecspi1 on the i.MX7 512M. We are trying to set up an i.MX7 1G in the same application. Using the same devicetree configuration we can’t enable ecspi1. I confirmed that the SPI pins are not being used in another pinctrl group. Listed below are the devicetree entries that work for the 512M but not the 1G:

&ecspi1 {
	status = "okay";

	spidev1: spidev@1 {
		compatible = "toradex,evalspi";
		reg = <0>;
		spi-max-frequency = <23000000>;
		status = "okay";
	};
};

&ecspi3 {
	status = "okay";

	mcp2515: can@0 {
		compatible = "microchip,mcp2515";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_can_int>;
		reg = <0>;
		clocks = <&clk16m>;
		interrupt-parent = <&gpio5>;
		interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
		spi-max-frequency = <10000000>;
		status = "disabled";
	};

	spidev0: spidev@0 {
		compatible = "toradex,evalspi";
		reg = <0>;
		spi-max-frequency = <23000000>;
		status = "okay";
	};
};

&ecspi1 {
	fsl,spi-num-chipselects = <1>;
	cs-gpios = <&gpio4 19 GPIO_ACTIVE_HIGH>;
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1_cs>;
};

&ecspi3 {
	fsl,spi-num-chipselects = <1>;
	cs-gpios = <&gpio4 11 GPIO_ACTIVE_HIGH>;
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_ecspi3 &pinctrl_ecspi3_cs>;
};

	pinctrl_ecspi1_cs: ecspi1_cs_grp {
		fsl,pins = <
			MX7D_PAD_ECSPI1_SS0__GPIO4_IO19     	0x14
		>;
	};

	pinctrl_ecspi1: ecspi1grp {
		fsl,pins = <
			MX7D_PAD_ECSPI1_MISO__ECSPI1_MISO   	0x2
			MX7D_PAD_ECSPI1_MOSI__ECSPI1_MOSI   	0x2
			MX7D_PAD_ECSPI1_SCLK__ECSPI1_SCLK   	0x2
		>;
	};

	pinctrl_ecspi3_cs: ecspi3_cs_grp {
		fsl,pins = <
			MX7D_PAD_I2C2_SDA__GPIO4_IO11		0x14
		>;
	};

	pinctrl_ecspi3: ecspi3grp {
		fsl,pins = <
			MX7D_PAD_I2C1_SCL__ECSPI3_MISO		0x2
			MX7D_PAD_I2C1_SDA__ECSPI3_MOSI		0x2
			MX7D_PAD_I2C2_SCL__ECSPI3_SCLK		0x2
		>;
	};

Thank you.

2

Dear @johnb,

It is possible that you are recompiling a single binary, loading it in both modules and therefore the 1GB DTB is not being updated. Take into account that the iMX7 512MB and 1GB use different SKUs and therefore, their DTBs are different: while the 512MB version uses a raw nand flash scheme, the 1GB uses eMMC. Even though the .dtsi are the same until some extent, the compiled device tree binary is different and therefore, you have to compile it as well: imx7d-colibri-emmc-eval-v3.dtb (1GB) vs imx7d-colibri-eval-v3.dtb (512MB). Please, check the following page and follow the “emmc” version for the 1GB module.

I’m not sure if the interface is appearing in /dev/ but you can quickly check since spidev is not on by default.

Best regards,
Alvaro.