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overlays: spi-rtc: Add ds3232 and ds3234 #4292

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Apr 21, 2021
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overlays: spi-rtc: Add ds3232 and ds3234 #4292

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12 changes: 11 additions & 1 deletion arch/arm/boot/dts/overlays/README
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Original file line number Diff line number Diff line change
Expand Up @@ -2689,7 +2689,17 @@ Params: <None>
Name: spi-rtc
Info: Adds support for a number of SPI Real Time Clock devices
Load: dtoverlay=spi-rtc,<param>=<val>
Params: pcf2123 Select the PCF2123 device
Params: ds3232 Select the DS3232 device
ds3234 Select the DS3234 device
pcf2123 Select the PCF2123 device

spi0_0 Use spi0.0 (default)
spi0_1 Use spi0.1
spi1_0 Use spi1.0
spi1_1 Use spi1.1
spi2_0 Use spi2.0
spi2_1 Use spi2.1
cs_high This device requires an active-high CS


Name: spi0-1cs
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58 changes: 50 additions & 8 deletions arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
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@@ -1,33 +1,75 @@
// Definitions for several SPI-based Real Time Clocks
/dts-v1/;
/plugin/;

/ {
compatible = "brcm,bcm2835";

fragment@0 {
target = <&spidev0>;
target = <&rtc>;
__dormant__ {
status = "disabled";
compatible = "maxim,ds3232";
};
};

fragment@1 {
target = <&spi0>;
target = <&rtc>;
__dormant__ {
compatible = "maxim,ds3234";
};
};

fragment@2 {
target = <&rtc>;
__dormant__ {
compatible = "nxp,rtc-pcf2123";
};
};

spidev: fragment@100 {
target = <&spidev0>;
__overlay__ {
status = "disabled";
};
};

frag101: fragment@101 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";

rtc-pcf2123@0 {
compatible = "nxp,rtc-pcf2123";
spi-max-frequency = <5000000>;
spi-cs-high = <1>;
rtc: rtc@0 {
reg = <0>;
spi-max-frequency = <5000000>;
};
};
};

__overrides__ {
pcf2123 = <0>, "=0=1";
spi0_0 = <&spidev>, "target:0=",<&spidev0>,
<&frag101>, "target:0=",<&spi0>,
<&rtc>, "reg:0=0";
spi0_1 = <&spidev>, "target:0=",<&spidev1>,
<&frag101>, "target:0=",<&spi0>,
<&rtc>, "reg:0=1";
spi1_0 = <0>,"-100",
<&frag101>, "target:0=",<&spi1>,
<&rtc>, "reg:0=0";
spi1_1 = <0>,"-100",
<&frag101>, "target:0=",<&spi1>,
<&rtc>, "reg:0=1";
spi2_0 = <0>,"-100",
<&frag101>, "target:0=",<&spi2>,
<&rtc>, "reg:0=0";
spi2_1 = <0>,"-100",
<&frag101>, "target:0=",<&spi2>,
<&rtc>, "reg:0=1";
cs_high = <&rtc>, "spi-cs-high?";

ds3232 = <0>,"+0";
ds3234 = <0>,"+1";
pcf2123 = <0>,"+2";
};
};