Refactor: Update dts to use gpiod

- Split up pinmux for ma2771 and skytraq.
- Add informative comments

Author: CullenSharp

device_trees/oresat-gps-0101.dts

@@ -23,55 +23,51 @@
     >;
   };
 
-  gps_gpio_pins: pinmux-gps-gpio-pins {
+  gps_gpio0_pins: pinmux-gps-gpio0-pins {
     pinctrl-single,pins = <
       AM33XX_IOPAD(AM335X_PIN_MII1_TXD3, PIN_INPUT | MUX_MODE7) /* gpio0_16 / MAX_LD */
-      AM33XX_IOPAD(AM335X_PIN_MII1_TX_EN, PIN_OUTPUT | MUX_MODE7) /* gpio3_3 / MAX_nSHDN */
-      AM33XX_IOPAD(AM335X_PIN_MII1_RX_ER, PIN_OUTPUT | MUX_MODE7) /* gpio3_2 / STQ_1PPS */
+    >;
+  };
+
+  gps_gpio3_pins: pinmux-gps-gpio3-pins {
+    pinctrl-single,pins = <
+      /* skytraq orion b16 gpio pins */
+      AM33XX_IOPAD(AM335X_PIN_MII1_RX_ER, PIN_INPUT | MUX_MODE7) /* gpio3_2 / STQ_1PPS */
+
+      /* max2771 gpio pins */
       AM33XX_IOPAD(AM335X_PIN_MII1_RX_DV, PIN_OUTPUT | MUX_MODE7) /* gpio3_4 / GPS_EN */
-      /* PRU pins */
+      AM33XX_IOPAD(AM335X_PIN_MII1_TX_EN, PIN_OUTPUT | MUX_MODE7) /* gpio3_3 / MAX_nSHDN */
+
+    >;
+  };
+
+  gps_pru_pins: pinmux-gps-pru-pins {
+    pinctrl-single,pins = <
+      /* PRU pins for reading data from the max2771 GNSS Receiver */
       AM33XX_IOPAD(AM335X_PIN_MCASP0_ACLKX, PIN_INPUT | MUX_MODE6) /* pr1_pru0_pru_r31_0 / MAX_I1 */
-      AM33XX_IOPAD(AM335X_PIN_MCASP0_FSX, PIN_INPUT | MUX_MODE6) /* pr1_pru0_pru_r31_1 / MAX_I0 */
-      AM33XX_IOPAD(AM335X_PIN_MCASP0_AXR0, PIN_INPUT | MUX_MODE6) /* pr1_pru0_pru_r31_2 / MAX_Q1 */
       AM33XX_IOPAD(AM335X_PIN_MCASP0_AHCLKR, PIN_INPUT | MUX_MODE6) /* pr1_pru0_pru_r31_3 / MAX_Q0 */
+      AM33XX_IOPAD(AM335X_PIN_MCASP0_AXR0, PIN_INPUT | MUX_MODE6) /* pr1_pru0_pru_r31_2 / MAX_Q1 */
+      AM33XX_IOPAD(AM335X_PIN_MCASP0_FSX, PIN_INPUT | MUX_MODE6) /* pr1_pru0_pru_r31_1 / MAX_I0 */
       AM33XX_IOPAD(AM335X_PIN_XDMA_EVENT_INTR1, PIN_INPUT | MUX_MODE5) /* pr1_pru0_pru_r31_16 / MAX_CLKOUT */
     >;
   };
 };
 
-&ocp {
-  cape-universal {
-    compatible = "gpio-of-helper";
-    status = "okay";
-    pinctrl-names = "default";
-    pinctrl-0 = <&gps_gpio_pins>;
-
-    MAX_LD {
-      gpio-name = "MAX_LD";
-      gpio = <&gpio0 16 GPIO_ACTIVE_HIGH>; /* AM335X_PIN_MII1_TXD3 */
-      input;
-    };
-
-    MAX_nSHDN{
-      gpio-name = "MAX_nSHDN";
-      gpio = <&gpio3 3 GPIO_ACTIVE_HIGH>; /* AM335X_PIN_MII1_TX_EN */
-      output;
-    };
-
-    STQ_EN {
-      gpio-name = "STQ_1PPS";
-      gpio = <&gpio3 2 GPIO_ACTIVE_HIGH>; /* AM335X_PIN_MII1_RX_ER */
-      output;
-    };
+&gpio0 {
+  pinctrl-names = "default";
+  pinctrl-0 = <&gps_gpio0_pins>;
+  gpio-line-names = "", "", "", "", "", "", "", "",
+                    "", "", "", "", "", "", "", "",
+                    "MAX_LD";
+};
 
-    MAX_EN {
-      gpio-name = "GPS_EN";
-      gpio = <&gpio3 4 GPIO_ACTIVE_HIGH>; /* AM335X_PIN_MII1_RX_DV */
-      output;
-    };
-  };
+&gpio3 {
+  pinctrl-names = "default";
+  pinctrl-0 = <&gps_gpio3_pins>;
+  gpio-line-names = "", "", "STQ_1PPS", "MAX_nSHDN", "GPS_EN";
 };
 
+
 &spi1 {
   status = "okay";
   pinctrl-names = "default";