bcm27xx: import latest patches from the RPi foundation

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>

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";
++	};
++};