diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0957-overlays-Add-spi0-1cs-and-spi0-2cs.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0957-overlays-Add-spi0-1cs-and-spi0-2cs.patch | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0957-overlays-Add-spi0-1cs-and-spi0-2cs.patch b/target/linux/bcm27xx/patches-5.4/950-0957-overlays-Add-spi0-1cs-and-spi0-2cs.patch new file mode 100644 index 0000000000..3af45bb0b6 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0957-overlays-Add-spi0-1cs-and-spi0-2cs.patch @@ -0,0 +1,199 @@ +From 692af7a59fd6d9d3b64edbf028cd75b0096ef8c7 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Fri, 28 Aug 2020 12:55:41 +0100 +Subject: [PATCH] overlays: Add spi0-1cs and spi0-2cs + +The spi0-1cs overlay allows the SPI0 interface to be run with a single +CS line, which can be useful if GPIOs are in short supply. The no_miso +parameter is for write-only devices that don't need the return channel, +and again is there to free up a GPIO. + +spi0-2cs is the new name for spi0-cs (now deprecated with a redirect +to spi0-2cs), but with the addedd no_miso parameter. + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + arch/arm/boot/dts/overlays/Makefile | 3 +- + arch/arm/boot/dts/overlays/README | 22 ++++++++-- + arch/arm/boot/dts/overlays/overlay_map.dts | 4 ++ + .../boot/dts/overlays/spi0-1cs-overlay.dts | 42 +++++++++++++++++++ + ...i0-cs-overlay.dts => spi0-2cs-overlay.dts} | 8 ++++ + 5 files changed, 75 insertions(+), 4 deletions(-) + create mode 100644 arch/arm/boot/dts/overlays/spi0-1cs-overlay.dts + rename arch/arm/boot/dts/overlays/{spi0-cs-overlay.dts => spi0-2cs-overlay.dts} (79%) + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -161,7 +161,8 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ + spi-gpio35-39.dtbo \ + spi-gpio40-45.dtbo \ + spi-rtc.dtbo \ +- spi0-cs.dtbo \ ++ spi0-1cs.dtbo \ ++ spi0-2cs.dtbo \ + spi1-1cs.dtbo \ + spi1-2cs.dtbo \ + spi1-3cs.dtbo \ +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -2412,11 +2412,27 @@ Load: dtoverlay=spi-rtc,<param>=<val> + Params: pcf2123 Select the PCF2123 device + + +-Name: spi0-cs +-Info: Allows the (software) CS pins for SPI0 to be changed +-Load: dtoverlay=spi0-cs,<param>=<val> ++Name: spi0-1cs ++Info: Only use one CS pin for SPI0 ++Load: dtoverlay=spi0-1cs,<param>=<val> ++Params: cs0_pin GPIO pin for CS0 (default 8) ++ no_miso Don't claim and use the MISO pin (9), freeing ++ it for other uses. ++ ++ ++Name: spi0-2cs ++Info: Change the CS pins for SPI0 ++Load: dtoverlay=spi0-2cs,<param>=<val> + Params: cs0_pin GPIO pin for CS0 (default 8) + cs1_pin GPIO pin for CS1 (default 7) ++ no_miso Don't claim and use the MISO pin (9), freeing ++ it for other uses. ++ ++ ++Name: spi0-cs ++Info: This overlay has been renamed spi0-1cs, keeping spi0-cs as an ++ alias for backwards compatibility. ++Load: <Deprecated> + + + Name: spi0-hw-cs +--- a/arch/arm/boot/dts/overlays/overlay_map.dts ++++ b/arch/arm/boot/dts/overlays/overlay_map.dts +@@ -61,6 +61,10 @@ + deprecated = "use sdio,bus_width=1,gpios_22_25"; + }; + ++ spi0-cs { ++ renamed = "spi0-2cs"; ++ }; ++ + spi0-hw-cs { + deprecated = "no longer necessary"; + }; +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/spi0-1cs-overlay.dts +@@ -0,0 +1,42 @@ ++/dts-v1/; ++/plugin/; ++ ++ ++/ { ++ compatible = "brcm,bcm2835"; ++ ++ fragment@0 { ++ target = <&spi0_cs_pins>; ++ frag0: __overlay__ { ++ brcm,pins = <8>; ++ }; ++ }; ++ ++ fragment@1 { ++ target = <&spi0>; ++ frag1: __overlay__ { ++ cs-gpios = <&gpio 8 1>; ++ status = "okay"; ++ }; ++ }; ++ ++ fragment@2 { ++ target = <&spidev1>; ++ __overlay__ { ++ status = "disabled"; ++ }; ++ }; ++ ++ fragment@3 { ++ target = <&spi0_pins>; ++ __dormant__ { ++ brcm,pins = <10 11>; ++ }; ++ }; ++ ++ __overrides__ { ++ cs0_pin = <&frag0>,"brcm,pins:0", ++ <&frag1>,"cs-gpios:4"; ++ no_miso = <0>,"=3"; ++ }; ++}; +--- a/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts ++++ /dev/null +@@ -1,29 +0,0 @@ +-/dts-v1/; +-/plugin/; +- +- +-/ { +- compatible = "brcm,bcm2835"; +- +- fragment@0 { +- target = <&spi0_cs_pins>; +- frag0: __overlay__ { +- brcm,pins = <8 7>; +- }; +- }; +- +- fragment@1 { +- target = <&spi0>; +- frag1: __overlay__ { +- cs-gpios = <&gpio 8 1>, <&gpio 7 1>; +- status = "okay"; +- }; +- }; +- +- __overrides__ { +- cs0_pin = <&frag0>,"brcm,pins:0", +- <&frag1>,"cs-gpios:4"; +- cs1_pin = <&frag0>,"brcm,pins:4", +- <&frag1>,"cs-gpios:16"; +- }; +-}; +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/spi0-2cs-overlay.dts +@@ -0,0 +1,37 @@ ++/dts-v1/; ++/plugin/; ++ ++ ++/ { ++ compatible = "brcm,bcm2835"; ++ ++ fragment@0 { ++ target = <&spi0_cs_pins>; ++ frag0: __overlay__ { ++ brcm,pins = <8 7>; ++ }; ++ }; ++ ++ fragment@1 { ++ target = <&spi0>; ++ frag1: __overlay__ { ++ cs-gpios = <&gpio 8 1>, <&gpio 7 1>; ++ status = "okay"; ++ }; ++ }; ++ ++ fragment@2 { ++ target = <&spi0_pins>; ++ __dormant__ { ++ brcm,pins = <10 11>; ++ }; ++ }; ++ ++ __overrides__ { ++ cs0_pin = <&frag0>,"brcm,pins:0", ++ <&frag1>,"cs-gpios:4"; ++ cs1_pin = <&frag0>,"brcm,pins:4", ++ <&frag1>,"cs-gpios:16"; ++ no_miso = <0>,"=2"; ++ }; ++}; |