diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0679-overlays-Add-spi0-0cs-overlay.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.15/950-0679-overlays-Add-spi0-0cs-overlay.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0679-overlays-Add-spi0-0cs-overlay.patch b/target/linux/bcm27xx/patches-5.15/950-0679-overlays-Add-spi0-0cs-overlay.patch new file mode 100644 index 0000000000..0419c6be59 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.15/950-0679-overlays-Add-spi0-0cs-overlay.patch @@ -0,0 +1,84 @@ +From 623f4a862134202e9f0705812cabe2abef6c2f9b Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Mon, 31 Jan 2022 21:01:25 +0000 +Subject: [PATCH] overlays: Add spi0-0cs overlay + +An overlay to enable SPI0 without claiming any chip select GPIOs. + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 8 ++++ + .../boot/dts/overlays/spi0-0cs-overlay.dts | 39 +++++++++++++++++++ + 3 files changed, 48 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/spi0-0cs-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -195,6 +195,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ + spi-gpio35-39.dtbo \ + spi-gpio40-45.dtbo \ + spi-rtc.dtbo \ ++ spi0-0cs.dtbo \ + spi0-1cs.dtbo \ + spi0-2cs.dtbo \ + spi1-1cs.dtbo \ +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -3115,6 +3115,14 @@ Params: ds3232 Select t + cs_high This device requires an active-high CS + + ++Name: spi0-0cs ++Info: Don't claim any CS pins for SPI0. Requires a device with its chip ++ select permanently enabled, but frees a GPIO for e.g. a DPI display. ++Load: dtoverlay=spi0-0cs,<param>=<val> ++Params: no_miso Don't claim and use the MISO pin (9), freeing ++ it for other uses. ++ ++ + Name: spi0-1cs + Info: Only use one CS pin for SPI0 + Load: dtoverlay=spi0-1cs,<param>=<val> +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/spi0-0cs-overlay.dts +@@ -0,0 +1,39 @@ ++/dts-v1/; ++/plugin/; ++ ++/ { ++ compatible = "brcm,bcm2835"; ++ ++ fragment@0 { ++ target = <&spi0_cs_pins>; ++ frag0: __overlay__ { ++ brcm,pins; ++ }; ++ }; ++ ++ fragment@1 { ++ target = <&spi0>; ++ __overlay__ { ++ cs-gpios; ++ status = "okay"; ++ }; ++ }; ++ ++ fragment@2 { ++ target = <&spidev1>; ++ __overlay__ { ++ status = "disabled"; ++ }; ++ }; ++ ++ fragment@3 { ++ target = <&spi0_pins>; ++ __dormant__ { ++ brcm,pins = <10 11>; ++ }; ++ }; ++ ++ __overrides__ { ++ no_miso = <0>,"=3"; ++ }; ++}; |