f07e572f64
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>
200 lines
4.7 KiB
Diff
200 lines
4.7 KiB
Diff
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";
|
|
+ };
|
|
+};
|