Add overlay and enable support for QCA7000 board

This adds a device tree overlay for the QCA7000 which can be used
when attaching an I2SE's PLC Stamp micro EVK to the Raspberry Pi.

This Evaluation Board embeds a QCA7000 chip, a Homeplug Green PHY
powerline chip from Qualcomm/Atheros for the Internet of Things.

This patch also enables the required QCA7000 driver module
in the default configurations.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Michael Heimpold <michael.heimpold@i2se.com>

arch/arm/boot/dts/overlays/Makefile

@@ -48,6 +48,7 @@ dtbo-$(RPI_DT_OVERLAYS) += pitft28-resistive.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += pps-gpio.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += pwm.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += pwm-2chan.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += qca7000.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += raspidac3.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += rpi-backlight.dtbo
 dtbo-$(RPI_DT_OVERLAYS) += rpi-dac.dtbo

arch/arm/boot/dts/overlays/README

@@ -625,6 +625,14 @@ Params: pin                     Output pin (default 18) - see table
         clock                   PWM clock frequency (informational)
 
 
+Name:   qca7000
+Info:   I2SE's Evaluation Board for PLC Stamp micro
+Load:   dtoverlay=qca7000,<param>=<val>
+Params: int_pin                 GPIO pin for interrupt signal (default 23)
+
+        speed                   SPI bus speed (default 12 MHz)
+
+
 Name:   raspidac3
 Info:   Configures the RaspiDAV Rev.3x audio card
 Load:   dtoverlay=raspidac3

arch/arm/boot/dts/overlays/qca7000-overlay.dts

@@ -0,0 +1,52 @@
+// Overlay for the Qualcomm Atheros QCA7000 on I2SE's PLC Stamp micro EVK
+// Visit: https://www.i2se.com/product/plc-stamp-micro-evk for details
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&spi0>;
+		__overlay__ {
+			/* needed to avoid dtc warning */
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "okay";
+
+			spidev@0 {
+				status = "disabled";
+			};
+
+			eth1: qca7000@0 {
+				compatible = "qca,qca7000";
+				reg = <0>; /* CE0 */
+				pinctrl-names = "default";
+				pinctrl-0 = <&eth1_pins>;
+				interrupt-parent = <&gpio>;
+				interrupts = <23 0x1>; /* rising edge */
+				spi-max-frequency = <12000000>;
+				status = "okay";
+			};
+		};
+	};
+
+	fragment@1 {
+		target = <&gpio>;
+		__overlay__ {
+			eth1_pins: eth1_pins {
+				brcm,pins = <23>;
+				brcm,function = <0>; /* in */
+				brcm,pull = <0>; /* none */
+			};
+		};
+	};
+
+	__overrides__ {
+		int_pin = <&eth1>, "interrupts:0",
+		          <&eth1_pins>, "brcm,pins:0";
+		speed   = <&eth1>, "spi-max-frequency:0";
+	};
+};

arch/arm/configs/bcm2709_defconfig

@@ -446,6 +446,7 @@ CONFIG_NETCONSOLE=m
 CONFIG_TUN=m
 CONFIG_VETH=m
 CONFIG_ENC28J60=m
+CONFIG_QCA7000=m
 CONFIG_MDIO_BITBANG=m
 CONFIG_PPP=m
 CONFIG_PPP_BSDCOMP=m

arch/arm/configs/bcmrpi_defconfig

@@ -439,6 +439,7 @@ CONFIG_NETCONSOLE=m
 CONFIG_TUN=m
 CONFIG_VETH=m
 CONFIG_ENC28J60=m
+CONFIG_QCA7000=m
 CONFIG_MDIO_BITBANG=m
 CONFIG_PPP=m
 CONFIG_PPP_BSDCOMP=m