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77 lines
2.1 KiB
Diff
77 lines
2.1 KiB
Diff
From a008938ed54a702e72a8421776c1d3f97b79a97b Mon Sep 17 00:00:00 2001
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From: Thomas Kriechbaumer <thomas@kriechbaumer.name>
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Date: Fri, 3 Jun 2016 09:40:44 +0200
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Subject: [PATCH] BCM270X_DT: Add spi-rtc overlay on SPI0.0
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Initial version only supports PCF2123 RTC.
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See: https://github.com/raspberrypi/linux/pull/1510
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 6 +++++
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arch/arm/boot/dts/overlays/spi-rtc-overlay.dts | 33 ++++++++++++++++++++++++++
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3 files changed, 40 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -78,6 +78,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
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+dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += spi1-3cs.dtbo
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -975,6 +975,12 @@ Load: dtoverlay=spi-gpio35-39
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Params: <None>
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+Name: spi-rtc
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+Info: Adds support for a number of SPI Real Time Clock devices
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+Load: dtoverlay=spi-rtc,<param>=<val>
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+Params: pcf2123 Select the PCF2123 device
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+
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+
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Name: spi1-1cs
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Info: Enables spi1 with a single chip select (CS) line and associated spidev
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dev node. The gpio pin number for the CS line and spidev device node
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
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@@ -0,0 +1,33 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&spidev0>;
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+ __dormant__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&spi0>;
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+ __dormant__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ rtc-pcf2123@0 {
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+ compatible = "nxp,rtc-pcf2123";
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+ spi-max-frequency = <5000000>;
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+ spi-cs-high = <1>;
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+ reg = <0>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ pcf2123 = <0>, "=0=1";
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+ };
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+};
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