diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0421-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0421-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0421-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch b/target/linux/brcm2708/patches-4.4/0421-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch new file mode 100644 index 0000000000..4300c54b84 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0421-BCM270X_DT-Overlay-to-re-enable-HW-CS-on-SPI0.patch @@ -0,0 +1,69 @@ +From 538f85c20d4209dbae6851f9733e3e3f0450ff32 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 */ ++ }; ++ }; ++}; |