Linux/PROCESSOR-SDK-AM437X: DTS entry for SPI2 on Starter Kit

Kurt Ozcetin

Tool/software: Linux

The am437x-sk-evm.dts file doesn't configure the SPI2 port on the starter kit. Only the MCSPI2 is accessible on that evaluation board. I was wondering if anyone has the modified dts file which configures both SPI2 and its DMA functionality on that starter kit.

over 8 years ago

0 Yordan Kovachev over 8 years ago

TI__Guru**** 161600 points

Hi,

For example, you can use something like:
spi2_pins: spi2_pins {
pinctrl-single,pins = <
/*SPI pinmux settings go here*/
>;
};
&spi2 {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&spi2_pins>;
spidev@0 {
#address-cells = <1>;
#size-cells = <0>;
spi-max-frequency = <24000000>;
reg = <0>;
compatible = "rohm,dh2228fv";
};
};

You should also enable the CONFIG_SPI_SPIDEV=y in your tisdk defconfig file.

Best Regards,
Yordan

0 Kurt Ozcetin over 8 years ago in reply to Yordan Kovachev

Prodigy 20 points

Thank you for your answer. I have run TI PinMux Cloud Tool to assign pinmux settings. For example, for the am437x starter kit (437x ZDN package) they are:

spi2_pins:spi2_pins {
       pinctrl-single,pins = <
        0x260 ( PIN_OUTPUT | MUX_MODE0 ) /* (N20) spi2_sclk.spi2_sclk */
       0x264 ( PIN_OUTPUT | MUX_MODE0 ) /* (P22) spi2_d0.spi2_d0 */
       0x268 ( PIN_INPUT | MUX_MODE0 ) /* (P20) spi2_d1.spi2_d1 */
       0x26c ( PIN_OUTPUT | MUX_MODE0 ) /* (T23) spi2_cs0.spi2_cs0 */
        >;
   };

AM437x is SPI Master in this case.

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Linux/PROCESSOR-SDK-AM437X: DTS entry for SPI2 on Starter Kit