Linux/AM3358: Device tree overlay issue

user5991815

Part Number: AM3358

Tool/software: Linux

Hi all,

I want to evaluate a wifi-module with the BeagleBoneBlack. In my devicetree-overlay I want to use the mmc3-interface as sdio and the uart4-interface as uart.

I insert the overlay in the /boot/uEnv.txt . After start up I see that the mmc3-pins and uart4-pins configuered as wanted. (verified by the tool 'show-pins'). The major issue is that the interface mmc3 is not activated/assigned to the pins. By this during startup the BB doesn't check if a module is connected to the mmc3 pins.

///////////////////////////////////////////////////////////////////////////////////////

/dts-v1/;

/ {
   part-number = "BLST-MMC3";
   version = "00A0";
   compatible = "ti,beaglebone", "ti,beaglebone-black";
   exclusive-use = "P8.33", "P8.35","P9.13", "P9.11", "uart4", "P8.18" , "P8.12" , "P8.10" , "P8.11" , "P8.16" , "P8.15" , "mmc3", "P8.07";

   fragment@0 {
       target = <0xffffffff>;

       __overlay__ {
           /* uart4 */
           P8_33_pinmux {
               status = "disabled";
           };

           P8_35_pinmux {
               status = "disabled";
           };
           P9_13_pinmux {
               status = "disabled";
           };
           P9_11_pinmux {
               status = "disabled";
           };



           /* mmc3 */
           P8_18_pinmux {
               status = "disabled";
           };

           P8_12_pinmux {
               status = "disabled";
           };

           P8_10_pinmux {
               status = "disabled";
           };

           P8_11_pinmux {
               status = "disabled";
           };

           P8_16_pinmux {
               status = "disabled";
           };

           P8_15_pinmux {
               status = "disabled";
           };

           /* Reset */
           P8_07_pinmux {
               status = "disabled";
           };

       };
   };

   fragment@1 {
       target = <0xffffffff>;

       __overlay__ {

           pinmux_mmc3_pins {
               pinctrl-single,pins = <
               0x88 0x33   /*mmc2_cmd */
               0x8c 0x33   /*mmc2_clk */
               0x30 0x33   /*mmc2_dat0*/
               0x34 0x33   /*mmc2_dat1*/
               0x38 0x33   /*mmc2_dat2*/
               0x3c 0x33   /*mmc2_dat3*/
               >;
               linux,phandle = <0x2>;
               phandle = <0x2>;
           };

           pinmux_uart4_pins_default {
               pinctrl-single,pins = <0x70 0x2e 0x74 0xe 0xd0 0xe 0xd4 0x26>;
               linux,phandle = <0x1>;
               phandle = <0x1>;
           };


           pinmux_reset_pd_pin {
               pinctrl-single,pins = <0x90 0x7f>;
               linux,phandle = <0x3>;
               phandle = <0x3>;
           };

       };
   };

   fragment@3 {
       target = <0xffffffff>;

       __overlay__ {
           compatible = "ti,omap4-hsmmc";
           dmas = <0xffffffff 0xc 0x0 0x1 0xffffffff 0xd 0x0 0x2>;
           dma-names = "tx", "rx";
           status = "okay";
           vmmc-supply = <0x2>;
           bus-width = <0x4>;
           non-removable;
           /* enable-sdio-wakeup;*/
           cap-power-off-card;
           broken-cd;
           ti,needs-special-reset;
           /* ti,needs-special-hs-handling;*/
           ti,hwmods = "mmc3";
           /* keep-power-in-suspend; */
           pinctrl-names = "default";
           pinctrl-0 = <0x2>;

           #address-cells = <0x1>;
           #size-cells = <0x0>;


           sd8xxx-wlan@2 {
               compatible = "marvell,sd8xxx";
               reg = <0x2>;
               interrupt-parent = <0xffffffff>;
               interrupts = <0x1d 0x1>;
           };

       };
   };

   fragment@4 {
       target = <0xffffffff>;

       __overlay__ {
           pinctrl-names = "default";
           pinctrl-0 = <0x1>;
           status = "okay";
       };
   };

   fragment@5 {
       target = <0xffffffff>;

       __overlay__ {
           pinctrl-names = "gpio_pu";
           pinctrl-0 = <0x3>;
           status = "okay";
       };
   };

   __symbols__ {
       mmc3_pins = "/fragment@1/__overlay__/pinmux_mmc3_pins";
       uart4_pins_default = "/fragment@1/__overlay__/pinmux_uart4_pins_default";
       wlcore = "/fragment@3/__overlay__/wlcore@2";

       reset_pin_default = "/fragment@1/__overlay__/pinmux_reset_pd_pin";

   };

   __fixups__ {

       ocp = "/fragment@0:target:0";
       am33xx_pinmux = "/fragment@1:target:0";
       mmc3 = "/fragment@3:target:0";
       edma_xbar = "/fragment@3/__overlay__:dmas:0", "/fragment@3/__overlay__:dmas:16";
       uart4 = "/fragment@4:target:0";
       P8_07_gpio_pu_pin = "/fragment@5:target:0";
   };

   __local_fixups__ {

       fragment@3 {

           __overlay__ {
               pinctrl-0 = <0x0>;
               };
       };

       fragment@4 {

           __overlay__ {
               pinctrl-0 = <0x0>;
           };
       };

       fragment@5 {

           __overlay__ {
               pinctrl-0 = <0x0>;
           };
       };

   };
};