1 From a008938ed54a702e72a8421776c1d3f97b79a97b Mon Sep 17 00:00:00 2001
2 From: Thomas Kriechbaumer <thomas@kriechbaumer.name>
3 Date: Fri, 3 Jun 2016 09:40:44 +0200
4 Subject: [PATCH] BCM270X_DT: Add spi-rtc overlay on SPI0.0
6 Initial version only supports PCF2123 RTC.
8 See: https://github.com/raspberrypi/linux/pull/1510
10 arch/arm/boot/dts/overlays/Makefile | 1 +
11 arch/arm/boot/dts/overlays/README | 6 +++++
12 arch/arm/boot/dts/overlays/spi-rtc-overlay.dts | 33 ++++++++++++++++++++++++++
13 3 files changed, 40 insertions(+)
14 create mode 100644 arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
16 --- a/arch/arm/boot/dts/overlays/Makefile
17 +++ b/arch/arm/boot/dts/overlays/Makefile
18 @@ -78,6 +78,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi.dtbo
19 dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
20 dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
21 dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
22 +dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
23 dtbo-$(RPI_DT_OVERLAYS) += spi1-1cs.dtbo
24 dtbo-$(RPI_DT_OVERLAYS) += spi1-2cs.dtbo
25 dtbo-$(RPI_DT_OVERLAYS) += spi1-3cs.dtbo
26 --- a/arch/arm/boot/dts/overlays/README
27 +++ b/arch/arm/boot/dts/overlays/README
28 @@ -975,6 +975,12 @@ Load: dtoverlay=spi-gpio35-39
33 +Info: Adds support for a number of SPI Real Time Clock devices
34 +Load: dtoverlay=spi-rtc,<param>=<val>
35 +Params: pcf2123 Select the PCF2123 device
39 Info: Enables spi1 with a single chip select (CS) line and associated spidev
40 dev node. The gpio pin number for the CS line and spidev device node
42 +++ b/arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
48 + compatible = "brcm,bcm2708";
51 + target = <&spidev0>;
53 + status = "disabled";
60 + #address-cells = <1>;
65 + compatible = "nxp,rtc-pcf2123";
66 + spi-max-frequency = <5000000>;
74 + pcf2123 = <0>, "=0=1";