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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
200 lines
4.7 KiB
Diff
200 lines
4.7 KiB
Diff
From 692af7a59fd6d9d3b64edbf028cd75b0096ef8c7 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Fri, 28 Aug 2020 12:55:41 +0100
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Subject: [PATCH] overlays: Add spi0-1cs and spi0-2cs
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The spi0-1cs overlay allows the SPI0 interface to be run with a single
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CS line, which can be useful if GPIOs are in short supply. The no_miso
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parameter is for write-only devices that don't need the return channel,
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and again is there to free up a GPIO.
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spi0-2cs is the new name for spi0-cs (now deprecated with a redirect
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to spi0-2cs), but with the addedd no_miso parameter.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 3 +-
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arch/arm/boot/dts/overlays/README | 22 ++++++++--
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arch/arm/boot/dts/overlays/overlay_map.dts | 4 ++
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.../boot/dts/overlays/spi0-1cs-overlay.dts | 42 +++++++++++++++++++
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...i0-cs-overlay.dts => spi0-2cs-overlay.dts} | 8 ++++
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5 files changed, 75 insertions(+), 4 deletions(-)
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create mode 100644 arch/arm/boot/dts/overlays/spi0-1cs-overlay.dts
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rename arch/arm/boot/dts/overlays/{spi0-cs-overlay.dts => spi0-2cs-overlay.dts} (79%)
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -161,7 +161,8 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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spi-gpio35-39.dtbo \
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spi-gpio40-45.dtbo \
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spi-rtc.dtbo \
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- spi0-cs.dtbo \
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+ spi0-1cs.dtbo \
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+ spi0-2cs.dtbo \
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spi1-1cs.dtbo \
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spi1-2cs.dtbo \
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spi1-3cs.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -2412,11 +2412,27 @@ Load: dtoverlay=spi-rtc,<param>=<val>
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Params: pcf2123 Select the PCF2123 device
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-Name: spi0-cs
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-Info: Allows the (software) CS pins for SPI0 to be changed
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-Load: dtoverlay=spi0-cs,<param>=<val>
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+Name: spi0-1cs
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+Info: Only use one CS pin for SPI0
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+Load: dtoverlay=spi0-1cs,<param>=<val>
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+Params: cs0_pin GPIO pin for CS0 (default 8)
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+ no_miso Don't claim and use the MISO pin (9), freeing
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+ it for other uses.
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+
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+
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+Name: spi0-2cs
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+Info: Change the CS pins for SPI0
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+Load: dtoverlay=spi0-2cs,<param>=<val>
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Params: cs0_pin GPIO pin for CS0 (default 8)
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cs1_pin GPIO pin for CS1 (default 7)
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+ no_miso Don't claim and use the MISO pin (9), freeing
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+ it for other uses.
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+
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+
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+Name: spi0-cs
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+Info: This overlay has been renamed spi0-1cs, keeping spi0-cs as an
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+ alias for backwards compatibility.
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+Load: <Deprecated>
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Name: spi0-hw-cs
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--- a/arch/arm/boot/dts/overlays/overlay_map.dts
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+++ b/arch/arm/boot/dts/overlays/overlay_map.dts
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@@ -61,6 +61,10 @@
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deprecated = "use sdio,bus_width=1,gpios_22_25";
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};
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+ spi0-cs {
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+ renamed = "spi0-2cs";
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+ };
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+
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spi0-hw-cs {
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deprecated = "no longer necessary";
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};
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/spi0-1cs-overlay.dts
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@@ -0,0 +1,42 @@
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+/dts-v1/;
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+/plugin/;
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+
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target = <&spi0_cs_pins>;
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+ frag0: __overlay__ {
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+ brcm,pins = <8>;
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&spi0>;
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+ frag1: __overlay__ {
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+ cs-gpios = <&gpio 8 1>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&spidev1>;
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+ __overlay__ {
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+ status = "disabled";
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+ };
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+ };
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+
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+ fragment@3 {
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+ target = <&spi0_pins>;
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+ __dormant__ {
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+ brcm,pins = <10 11>;
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+ };
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+ };
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+
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+ __overrides__ {
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+ cs0_pin = <&frag0>,"brcm,pins:0",
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+ <&frag1>,"cs-gpios:4";
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+ no_miso = <0>,"=3";
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+ };
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+};
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--- a/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
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+++ /dev/null
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@@ -1,29 +0,0 @@
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-/dts-v1/;
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-/plugin/;
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-
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-
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-/ {
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- compatible = "brcm,bcm2835";
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-
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- fragment@0 {
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- target = <&spi0_cs_pins>;
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- frag0: __overlay__ {
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- brcm,pins = <8 7>;
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- };
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- };
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-
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- fragment@1 {
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- target = <&spi0>;
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- frag1: __overlay__ {
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- cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
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- status = "okay";
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- };
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- };
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-
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- __overrides__ {
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- cs0_pin = <&frag0>,"brcm,pins:0",
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- <&frag1>,"cs-gpios:4";
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- cs1_pin = <&frag0>,"brcm,pins:4",
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- <&frag1>,"cs-gpios:16";
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- };
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-};
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/spi0-2cs-overlay.dts
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@@ -0,0 +1,37 @@
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+/dts-v1/;
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+/plugin/;
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+
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target = <&spi0_cs_pins>;
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+ frag0: __overlay__ {
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+ brcm,pins = <8 7>;
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&spi0>;
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+ frag1: __overlay__ {
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+ cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&spi0_pins>;
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+ __dormant__ {
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+ brcm,pins = <10 11>;
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+ };
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+ };
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+
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+ __overrides__ {
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+ cs0_pin = <&frag0>,"brcm,pins:0",
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+ <&frag1>,"cs-gpios:4";
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+ cs1_pin = <&frag0>,"brcm,pins:4",
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+ <&frag1>,"cs-gpios:16";
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+ no_miso = <0>,"=2";
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+ };
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+};
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