Add overlay for mcp3008 adc (#1818)

Some example usage:

SPI0.0
dtparam=spi=on
dtoverlay=mcp3008:spi0-0-present

SPI0.1
dtparam=spi=on
dtoverlay=mcp3008:spi0-1-present

SPI0.0 and SPI0.1
dtparam=spi=on
dtoverlay=mcp3008:spi0-0-present,spi0-1-present

SPI1.0
dtparam=spi=on
dtoverlay=spi1-1cs
dtoverlay=mcp3008:spi1-0-present

SPI1.2
dtparam=spi=on
dtoverlay=spi1-1cs:cs0_pin=16
dtoverlay=mcp3008:spi1-0-present

SPI1.0 and SPI1.1
dtoverlay=spi1-2cs
dtoverlay=mcp3008:spi1-0-present,spi1-1-present

Changing the speed

SPI0.0
dtparam=spi=on
dtoverlay=mcp3008:spi0-0-present,spi0-0-speed=2000000

diff --git a/arch/arm/boot/dts/overlays/Makefile b/arch/arm/boot/dts/overlays/Makefile
index 842098be7776ae9005528b87a13890341bb4097f..e915dff8a4cdf5af3df0aa519b3ee08dd970d831 100644 (file)
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -47,6 +47,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
        mcp23s17.dtbo \
        mcp2515-can0.dtbo \
        mcp2515-can1.dtbo \
+       mcp3008.dtbo \
        midi-uart0.dtbo \
        mmc.dtbo \
        mz61581.dtbo \

diff --git a/arch/arm/boot/dts/overlays/README b/arch/arm/boot/dts/overlays/README
index 2f542a810c3f200939f5996d62b118392ae0b14e..aa9b6128c397b33e9c40eec29476d8352933c237 100644 (file)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -742,6 +742,15 @@ Params: oscillator              Clock frequency for the CAN controller (Hz)
         interrupt               GPIO for interrupt signal
 
 
+Name:   mcp3008
+Info:   Configures MCP3008 A/D converters
+        For devices on spi1 or spi2, the interfaces should be enabled
+        with one of the spi1-1/2/3cs and/or spi2-1/2/3cs overlays.
+Load:   dtoverlay=mcp3008,<param>[=<val>]
+Params: spi<n>-<m>-present      boolean, configure device at spi<n>, cs<m>
+        spi<n>-<m>-speed        integer, set the spi bus speed for this device
+
+
 Name:   midi-uart0
 Info:   Configures UART0 (ttyAMA0) so that a requested 38.4kbaud actually gets
         31.25kbaud, the frequency required for MIDI

diff --git a/arch/arm/boot/dts/overlays/mcp3008-overlay.dts b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
new file mode 100755 (executable)
index 0000000..06bf426
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/mcp3008-overlay.dts
@@ -0,0 +1,205 @@
+/*
+ * Device tree overlay for Microchip mcp3008 10-Bit A/D Converters
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+       compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
+
+       fragment@0 {
+               target = <&spidev0>;
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@1 {
+               target = <&spidev1>;
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@2 {
+               target-path = "spi1/spidev@0";
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@3 {
+               target-path = "spi1/spidev@1";
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@4 {
+               target-path = "spi1/spidev@2";
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@5 {
+               target-path = "spi2/spidev@0";
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@6 {
+               target-path = "spi2/spidev@1";
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@7 {
+               target-path = "spi2/spidev@2";
+               __dormant__ {
+                       status = "disabled";
+               };
+       };
+
+       fragment@8 {
+               target = <&spi0>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_00: mcp3008@0 {
+                               compatible = "mcp3008";
+                               reg = <0>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@9 {
+               target = <&spi0>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_01: mcp3008@1 {
+                               compatible = "mcp3008";
+                               reg = <1>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@10 {
+               target = <&spi1>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_10: mcp3008@0 {
+                               compatible = "mcp3008";
+                               reg = <0>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@11 {
+               target = <&spi1>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_11: mcp3008@1 {
+                               compatible = "mcp3008";
+                               reg = <1>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@12 {
+               target = <&spi1>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_12: mcp3008@2 {
+                               compatible = "mcp3008";
+                               reg = <2>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@13 {
+               target = <&spi2>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_20: mcp3008@0 {
+                               compatible = "mcp3008";
+                               reg = <0>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@14 {
+               target = <&spi2>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_21: mcp3008@1 {
+                               compatible = "mcp3008";
+                               reg = <1>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       fragment@15 {
+               target = <&spi2>;
+               __dormant__ {
+                       status = "okay";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       mcp3008_22: mcp3008@2 {
+                               compatible = "mcp3008";
+                               reg = <2>;
+                               spi-max-frequency = <1600000>;
+                       };
+               };
+       };
+
+       __overrides__ {
+               spi0-0-present = <0>, "+0+8";
+               spi0-1-present = <0>, "+1+9";
+               spi1-0-present = <0>, "+2+10";
+               spi1-1-present = <0>, "+3+11";
+               spi1-2-present = <0>, "+4+12";
+               spi2-0-present = <0>, "+5+13";
+               spi2-1-present = <0>, "+6+14";
+               spi2-2-present = <0>, "+7+15";
+               spi0-0-speed = <&mcp3008_00>, "spi-max-frequency:0";
+               spi0-1-speed = <&mcp3008_01>, "spi-max-frequency:0";
+               spi1-0-speed = <&mcp3008_10>, "spi-max-frequency:0";
+               spi1-1-speed = <&mcp3008_11>, "spi-max-frequency:0";
+               spi1-2-speed = <&mcp3008_12>, "spi-max-frequency:0";
+               spi2-0-speed = <&mcp3008_20>, "spi-max-frequency:0";
+               spi2-1-speed = <&mcp3008_21>, "spi-max-frequency:0";
+               spi2-2-speed = <&mcp3008_22>, "spi-max-frequency:0";
+       };
+};