From 538f85c20d4209dbae6851f9733e3e3f0450ff32 Mon Sep 17 00:00:00 2001 From: Phil Elwell 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 --- 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,= 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: + + 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 */ + }; + }; +};