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How to configure the PRU Cape dtsi file for AM437x

Gavin Wang
Prodigy 100 points

I was follow Lab4 the PRU Training, but get a problem in PRU Cape

5. Modify to SDK provided DTS (devicetree source) files to account for the PRU cape.

a. Copy the am437x-gp-evm-prucape.dtsi from the <PRU_SW_PATH>/pru_cape directory to arch/arm/boot/dts.
b. In your kernel source tree, open arch/arm/boot/dts/am437x-gp-evm.dts for editing.
c. Add the below line to include the PRU Cape DTS file to the bottomof the am437x-gp-evm.dts file.
#include "am437x-gp-evm-prucape.dtsi"
d. Save the file.

Beacase my EVM board is am437x-gp-evm board. so I was change from AM335x to AM437x and Modify am335x-boneblack-prucape.dtsi to AM437x-gp-evm-prucape.dtsi, below as

1.   0x190 0x00050005 /* mcasp0_aclkx, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Blue LED, pr0_pru0_gpo0 */
2.   0x194 0x00050005 /* mcasp0_fsx, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Green LED, pr0_pru0_gpo1 */
3.   0x198 0x00050005 /* mcasp0_axr0, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Orange LED, pr0_pru0_gpo2 */
4.   0x19c 0x00050005 /* mcasp0_ahclkr, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Red LED, pr0_pru0_gpo3 */

/*
 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

&am43xx_pinmux {
 pru_cape_bone_pins: pru_cape_bone_pins {
      pinctrl-single,pins = <
        0x190 0x00050005 /* mcasp0_aclkx, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Blue LED, pr0_pru0_gpo0 */
        0x194 0x00050005 /* mcasp0_fsx, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Green LED, pr0_pru0_gpo1 */
        0x198 0x00050005 /* mcasp0_axr0, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Orange LED, pr0_pru0_gpo2 */
        0x19c 0x00050005 /* mcasp0_ahclkr, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Red LED, pr0_pru0_gpo3 */
       >;
      };
};

&mcasp1 {
 status = "disabled";
};

&sound0 {
 status = "disabled";
};

&pruss {
        pinctrl-names = "default";
 pinctrl-0 = <&pru_cape_bone_pins>;
};

And then Compile the DTS file:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- am437x-gp-evm.dtb

Get the error message

"Error: arch/arm/boot/dts/am437x-gp-evm-prucape.dtsi:9.1-15 syntax error"

note: Would you provide the AM437x dtsi example code,  

  • 0
    TI__Guru**** 161600 points
    Hi,

    You should add the pru pinmux settings directly in the am437x-gp-evm.dts file, like:
    pruss_pins: pruss_pins {
    pinctrl-single,pins = <
    0x190 0x00050005 /* mcasp0_aclkx, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Blue LED, pr0_pru0_gpo0 */
    0x194 0x00050005 /* mcasp0_fsx, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Green LED, pr0_pru0_gpo1 */
    0x198 0x00050005 /* mcasp0_axr0, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Orange LED, pr0_pru0_gpo2 */
    0x19c 0x00050005 /* mcasp0_ahclkr, OMAP_MUX_MODE5 | AM437X_PIN_OUTPUT, PRU CAPE Red LED, pr0_pru0_gpo3 */
    >;
    };

    &pruss {
    pinctrl-names = "default";
    pinctrl-0 = <&pru_cape_bone_pins>;
    status = "okay";
    };

    And then compile the kernel.

    Hope this helps.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Prodigy 100 points
    Hi,
    I was add pru pinmux setting into am437x-gp-evm.dts file. but get another error. below as

    "Error : arch/arm/bootdts/am437x-gp-evm-prucape.dtsi:9.1-15 syntax error"
    "FATAL ERROR : unable to parse input tree"
  • 0 in reply to Gavin Wang
    TI__Guru**** 161600 points
    Hi,

    You should remove the #include "am437x-gp-evm-prucape.dtsi" line, and apply the pru settings directly in am437x dts file. Take a reference from the other pinmux settings in am437x-gp-evm.dts.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Prodigy 100 points
    Hi
    Thanks for you reply. follow your suggestion.
    1. remove the #include "am437x-gp-evm-prucape.dtsi"
    2. Add the pru pinmux settings into dts file

    pruss_pins: pruss_pins {
    pinctrl-single,pins = <
    0x190 (PIN_OUTPUT_PULLDOWN | MUX_MODE5)
    0x194 (PIN_OUTPUT_PULLDOWN | MUX_MODE5)
    0x198 (PIN_OUTPUT_PULLDOWN | MUX_MODE5)
    0x19C (PIN_OUTPUT_PULLDOWN | MUX_MODE5)
    >;
    };
    .
    .
    .

    &pruss {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&pruss_pins>;
    };

    Error message: Error: arch/arm/boot/dts/am437x-gp-evm.dts:1253.3-4 label or path, 'pruss', not found

    I have no idea for not found "pruss".
  • 0 in reply to Gavin Wang
    TI__Guru**** 393215 points
    This whole effort is completely meaningless. The PRU training lab you try to follow is based on a completely different set of boards: one is AM335X Beaglebone Black, and the other is the PRU Cape for Beaglebone Black. Blindly copying steps from the training lab will not help you on your AM437X EVM, and even if you get the system running it's very likely you will burn something on your board, as the pinmuxing must match exactly the hardware you have.
  • 0 in reply to Biser Gatchev-XID
    Prodigy 100 points
    Thanks for your suggestion. Would TI has provided relevant PRU training for AM437x??? If not, how do we understand and use the new products it. How do we get started it's good for beginners.
  • 0 in reply to Gavin Wang
    TI__Guru**** 393215 points
    The PRU-ICSS is the same in both AM335X and AM437X. You could get a BBB and a PRU Cape and what you do on them will be quite the same on AM437X.