From 0583a0c3f173c327dff70ee9d7a0d70e50b5d120 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 1 Jul 2016 22:34:52 +0100
Subject: [PATCH] BCM270X_DT: Overlay to re-enable HW CS on SPI0

See: https://github.com/raspberrypi/linux/issues/1547

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/boot/dts/overlays/Makefile               |  1 +
 arch/arm/boot/dts/overlays/README                 |  6 ++++++
 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts | 26 +++++++++++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/spi0-hw-cs-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -81,6 +81,7 @@ 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-$(RPI_DT_OVERLAYS) += spi0-hw-cs.dtbo
 dtbo-$(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
@@ -1006,6 +1006,12 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
 Params: pcf2123                 Select the PCF2123 device
 
 
+Name:   spi0-hw-cs
+Info:   Re-enables hardware CS/CE (chip selects) for SPI0
+Load:   dtoverlay=spi0-hw-cs
+Params: <None>
+
+
 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/spi0-hw-cs-overlay.dts
@@ -0,0 +1,26 @@
+/*
+ * Device tree overlay to re-enable hardware CS for SPI0
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
+
+	fragment@0 {
+		target = <&spi0>;
+		__overlay__ {
+			cs-gpios = <0>, <0>;
+			status = "okay";
+		};
+	};
+
+	fragment@1 {
+		target = <&spi0_cs_pins>;
+		__overlay__ {
+			brcm,pins = <8 7>;
+			brcm,function = <4>; /* alt0 */
+		};
+	};
+};
