1 From 0583a0c3f173c327dff70ee9d7a0d70e50b5d120 Mon Sep 17 00:00:00 2001
2 From: Phil Elwell <phil@raspberrypi.org>
3 Date: Fri, 1 Jul 2016 22:34:52 +0100
4 Subject: [PATCH] BCM270X_DT: Overlay to re-enable HW CS on SPI0
6 See: https://github.com/raspberrypi/linux/issues/1547
8 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
10 arch/arm/boot/dts/overlays/Makefile | 1 +
11 arch/arm/boot/dts/overlays/README | 6 ++++++
12 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts | 26 +++++++++++++++++++++++
13 3 files changed, 33 insertions(+)
14 create mode 100644 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts
16 --- a/arch/arm/boot/dts/overlays/Makefile
17 +++ b/arch/arm/boot/dts/overlays/Makefile
18 @@ -81,6 +81,7 @@ dtbo-$(RPI_DT_OVERLAYS) += smi-dev.dtbo
19 dtbo-$(RPI_DT_OVERLAYS) += smi-nand.dtbo
20 dtbo-$(RPI_DT_OVERLAYS) += spi-gpio35-39.dtbo
21 dtbo-$(RPI_DT_OVERLAYS) += spi-rtc.dtbo
22 +dtbo-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
23 dtbo-$(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 @@ -1006,6 +1006,12 @@ Load: dtoverlay=spi-rtc,<param>=<val>
29 Params: pcf2123 Select the PCF2123 device
33 +Info: Re-enables hardware CS/CE (chip selects) for SPI0
34 +Load: dtoverlay=spi0-hw-cs
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/spi0-hw-cs-overlay.dts
45 + * Device tree overlay to re-enable hardware CS for SPI0
52 + compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
57 + cs-gpios = <0>, <0>;
63 + target = <&spi0_cs_pins>;
66 + brcm,function = <4>; /* alt0 */