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From 6790d3a4683d7e2e6e0fe1bbc7ab856f23e37885 Mon Sep 17 00:00:00 2001
From: Thomas Kriechbaumer <thomas@kriechbaumer.name>
Date: Fri, 3 Jun 2016 09:40:44 +0200
Subject: [PATCH] BCM270X_DT: Add spi-rtc overlay on SPI0.0
Initial version only supports PCF2123 RTC.
See: https://github.com/raspberrypi/linux/pull/1510
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 6 +++++
arch/arm/boot/dts/overlays/spi-rtc-overlay.dts | 33 ++++++++++++++++++++++++++
3 files changed, 40 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -78,6 +78,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi.dtbo
dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
+dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
dtbo-$(RPI_DT_OVERLAYS) += spi1-3cs.dtbo
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -975,6 +975,12 @@ Load: dtoverlay=spi-gpio35-39
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
+
+
Name: spi1-1cs
Info: Enables spi1 with a single chip select (CS) line and associated spidev
dev node. The gpio pin number for the CS line and spidev device node
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
@@ -0,0 +1,33 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target = <&spidev0>;
+ __dormant__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@1 {
+ target = <&spi0>;
+ __dormant__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ rtc-pcf2123@0 {
+ compatible = "nxp,rtc-pcf2123";
+ spi-max-frequency = <5000000>;
+ spi-cs-high = <1>;
+ reg = <0>;
+ };
+ };
+ };
+
+ __overrides__ {
+ pcf2123 = <0>, "=0=1";
+ };
+};
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