ev11l78a: update devicetree definition of ev11l78a.

This includes an important fix for RAM and Flash size (not all samd20 are
the same, but unlike the samc20 series there's no separate dtsi files
for the various sizes.)

In addition to that, it adds custom bindings for the EN_SINK output
in (which is what enables the actual sink for the board), and exposes the
1.5A and 3.0A indicators as LEDs (even though they are just test points)
and enables the DAC.

Signed-off-by: Diego Elio Pettenò <[email protected]>

boards/arm/ev11l78a/doc/index.rst

@@ -54,6 +54,8 @@ features:
 +-----------+------------+------------------------------------------+
 | ADC       | on-chip    | Analog-to-Digital Converter              |
 +-----------+------------+------------------------------------------+
+| DAC       | on-chip    | Digital-to-Analog Converter              |
++-----------+------------+------------------------------------------+
 
 Other hardware features are not currently supported by Zephyr.
 

boards/arm/ev11l78a/dts/bindings/microchip,ev11l78a-ensink.yaml

@@ -0,0 +1,13 @@
+# Copyright (c) 2023, Meta Platforms, Inc. and its affiliates.
+# SPDX-License-Identifier: Apache-2.0
+
+description: GPIO used to enable the power Sink on the EV11L78A board
+
+compatible: "microchip,ev11l78a-ensink"
+
+properties:
+  gpios:
+    type: phandle-array
+    required: true
+    description: |
+      GPIO to enable the power sink on the EV11L78A board, output.

boards/arm/ev11l78a/ev11l78a-pinctrl.dtsi

@@ -34,4 +34,10 @@
 				 <PA5B_ADC_AIN5>;
 		};
 	};
+
+	dac_default: dac_default {
+		group1 {
+			pinmux = <PA2B_DAC_VOUT>;
+		};
+	};
 };

boards/arm/ev11l78a/ev11l78a.dts

@@ -5,6 +5,7 @@
  */
 
 /dts-v1/;
+#include <mem.h>
 #include <freq.h>
 #include <atmel/samd20.dtsi>
 #include "ev11l78a-pinctrl.dtsi"
@@ -32,6 +33,18 @@
 			gpios = <&porta 23 GPIO_ACTIVE_HIGH>;
 			label = "CAP_MIS";
 		};
+
+		// The following are not LEDs on the board, but rather
+		// testpoints. On the other hand, they are "fit the part."
+		ind_1_5a: led_1 {
+			gpios = <&porta 1 GPIO_ACTIVE_HIGH>;
+			label = "1.5A_IND";
+		};
+
+		ind_3_0a: led_2 {
+			gpios = <&porta 15 GPIO_ACTIVE_HIGH>;
+			label = "3.0A_IND";
+		};
 	};
 
 	csa_i_sense: i_sense {
@@ -41,6 +54,11 @@
 		sense-gain-mult = <100>;
 	};
 
+	enable_sink: enable_sink {
+		compatible = "microchip,ev11l78a-ensink";
+		gpios = <&porta 22 GPIO_ACTIVE_HIGH>;
+	};
+
 };
 
 &cpu0 {
@@ -83,7 +101,13 @@
 	pinctrl-names = "default";
 };
 
+&sram0 {
+	reg = <0x20000000 DT_SIZE_K(8)>;
+};
+
 &flash0 {
+	reg = <0 DT_SIZE_K(64)>;
+
 	partitions {
 		compatible = "fixed-partitions";
 		#address-cells = <1>;
@@ -94,9 +118,9 @@
 		 * Storage partition will be used by FCB/LittleFS/NVS
 		 * if enabled.
 		 */
-		storage_partition: partition@3c000 {
+		storage_partition: partition@c000 {
 			label = "storage";
-			reg = <0x0003c000 0x00004000>;
+			reg = <0x0000c000 DT_SIZE_K(16)>;
 		};
 	};
 };
@@ -120,3 +144,10 @@
 	pinctrl-0 = <&adc_default>;
 	pinctrl-names = "default";
 };
+
+&dac0 {
+	status = "okay";
+
+	pinctrl-0 = <&dac_default>;
+	pinctrl-names = "default";
+};

boards/arm/ev11l78a/ev11l78a.yaml

@@ -10,6 +10,7 @@ toolchain:
   - xtools
 supported:
   - adc
+  - dac
   - gpio
   - i2c
   - spi