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, 217 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch b/target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch
new file mode 100644
index 0000000000..a5bbbdd4e6
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-1035-Add-overlay-for-Seeed-Studio-CAN-BUS-FD-HAT-4034.patch
@@ -0,0 +1,217 @@
+From 4a314a9b9d91cacbf6be9dd521cf3abd3ae8bcef Mon Sep 17 00:00:00 2001
+From: menschel <menschel.p@posteo.de>
+Date: Wed, 30 Dec 2020 21:55:34 +0100
+Subject: [PATCH] Add overlay for Seeed Studio CAN BUS FD HAT (#4034)
+
+This patch adds the overlay for the Seeed Studio CAN BUS FD HAT
+with two CAN FD Channels and an RTC.
+https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html
+
+The overlay was generated by
+ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \
+           mcp251xfd-overlay.dts,spi0-1,interrupt=24 \
+           i2c-rtc-overlay.dts,pcf85063
+
+
+Also, add description on how to generate overlays
+
+Signed-off-by: Patrick Menschel <menschel.p@posteo.de>
+---
+ arch/arm/boot/dts/overlays/Makefile           |   1 +
+ arch/arm/boot/dts/overlays/README             |  46 +++++++
+ .../dts/overlays/seeed-can-fd-hat-overlay.dts | 117 ++++++++++++++++++
+ 3 files changed, 164 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/seeed-can-fd-hat-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -159,6 +159,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
+ 	sc16is752-spi1.dtbo \
+ 	sdhost.dtbo \
+ 	sdio.dtbo \
++	seeed-can-fd-hat.dtbo \
+ 	sh1106-spi.dtbo \
+ 	smi.dtbo \
+ 	smi-dev.dtbo \
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -81,6 +81,44 @@ Parameters usually have default values,
+ mandatory. See the list of overlays below for a description of the parameters
+ and their defaults.
+ 
++Making new Overlays based on existing Overlays
++==============================================
++
++Recent overlays have been designed in a more general way, so that they can be
++adapted to hardware by changing their parameters. When you have additional
++hardware with more than one device of a kind, you end up using the same overlay
++multiple times with other parameters, e.g.
++
++    # 2 CAN FD interfaces on spi but with different pins
++    dtoverlay=mcp251xfd,spi0-0,interrupt=25
++    dtoverlay=mcp251xfd,spi0-1,interrupt=24
++
++    # a realtime clock on i2c
++    dtoverlay=i2c-rtc,pcf85063
++
++While this approach does work, it requires knowledge about the hardware design.
++It is more feasible to simplify things for the end user by providing a single
++overlay as it is done the traditional way.
++
++A new overlay can be generated by using ovmerge utility.
++https://github.com/raspberrypi/utils/blob/master/ovmerge/ovmerge
++
++To generate an overlay for the above configuration we pass the configuration
++to ovmerge and add the -c flag.
++
++    ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 \
++               mcp251xfd-overlay.dts,spi0-1,interrupt=24 \
++               i2c-rtc-overlay.dts,pcf85063 \
++    >> merged-overlay.dts
++
++The -c option writes the command above as a comment into the overlay as
++a marker that this overlay is generated and how it was generated.
++After compiling the overlay it can be loaded in a single line.
++
++    dtoverlay=merged
++
++It does the same as the original configuration but without parameters.
++
+ The Overlay and Parameter Reference
+ ===================================
+ 
+@@ -2422,6 +2460,14 @@ Info:   This overlay is now deprecated.
+ Load:   <Deprecated>
+ 
+ 
++Name:   seeed-can-fd-hat
++Info:   Overlay for Seeed Studio CAN BUS FD HAT with two CAN FD channels and an
++        RTC.
++        https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html
++Load:   dtoverlay=seeed-can-fd-hat
++Params: <None>
++
++
+ Name:   sh1106-spi
+ Info:   Overlay for SH1106 OLED via SPI using fbtft staging driver.
+ Load:   dtoverlay=sh1106-spi,<param>=<val>
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/seeed-can-fd-hat-overlay.dts
+@@ -0,0 +1,117 @@
++// redo: ovmerge -c mcp251xfd-overlay.dts,spi0-0,interrupt=25 mcp251xfd-overlay.dts,spi0-1,interrupt=24 i2c-rtc-overlay.dts,pcf85063
++
++// Device tree overlay for https://www.seeedstudio.com/CAN-BUS-FD-HAT-for-Raspberry-Pi-p-4742.html 
++
++/dts-v1/;
++/plugin/;
++
++#include <dt-bindings/gpio/gpio.h>
++#include <dt-bindings/interrupt-controller/irq.h>
++#include <dt-bindings/pinctrl/bcm2835.h>
++
++/ {
++	compatible = "brcm,bcm2835";
++	fragment@0 {
++		target = <&spidev0>;
++		__overlay__ {
++			status = "disabled";
++		};
++	};
++	fragment@1 {
++		target = <&gpio>;
++		__overlay__ {
++			mcp251xfd_pins: mcp251xfd_spi0_0_pins {
++				brcm,pins = <25>;
++				brcm,function = <BCM2835_FSEL_GPIO_IN>;
++			};
++		};
++	};
++	fragment@2 {
++		target-path = "/clocks";
++		__overlay__ {
++			clk_mcp251xfd_osc: mcp251xfd-spi0-0-osc {
++				#clock-cells = <0>;
++				compatible = "fixed-clock";
++				clock-frequency = <40000000>;
++			};
++		};
++	};
++	fragment@3 {
++		target = <&spi0>;
++		__overlay__ {
++			status = "okay";
++			#address-cells = <1>;
++			#size-cells = <0>;
++			mcp251xfd@0 {
++				compatible = "microchip,mcp251xfd";
++				reg = <0>;
++				pinctrl-names = "default";
++				pinctrl-0 = <&mcp251xfd_pins>;
++				spi-max-frequency = <20000000>;
++				interrupt-parent = <&gpio>;
++				interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
++				clocks = <&clk_mcp251xfd_osc>;
++			};
++		};
++	};
++	fragment@4 {
++		target = <&spidev1>;
++		__overlay__ {
++			status = "disabled";
++		};
++	};
++	fragment@5 {
++		target = <&gpio>;
++		__overlay__ {
++			mcp251xfd_pins_1: mcp251xfd_spi0_1_pins {
++				brcm,pins = <24>;
++				brcm,function = <BCM2835_FSEL_GPIO_IN>;
++			};
++		};
++	};
++	fragment@6 {
++		target-path = "/clocks";
++		__overlay__ {
++			clk_mcp251xfd_osc_1: mcp251xfd-spi0-1-osc {
++				#clock-cells = <0>;
++				compatible = "fixed-clock";
++				clock-frequency = <40000000>;
++			};
++		};
++	};
++	fragment@7 {
++		target = <&spi0>;
++		__overlay__ {
++			status = "okay";
++			#address-cells = <1>;
++			#size-cells = <0>;
++			mcp251xfd@1 {
++				compatible = "microchip,mcp251xfd";
++				reg = <1>;
++				pinctrl-names = "default";
++				pinctrl-0 = <&mcp251xfd_pins_1>;
++				spi-max-frequency = <20000000>;
++				interrupt-parent = <&gpio>;
++				interrupts = <24 IRQ_TYPE_LEVEL_LOW>;
++				clocks = <&clk_mcp251xfd_osc_1>;
++			};
++		};
++	};
++	fragment@8 {
++		target = <&i2cbus>;
++		__overlay__ {
++			#address-cells = <1>;
++			#size-cells = <0>;
++			pcf85063@51 {
++				compatible = "nxp,pcf85063";
++				reg = <0x51>;
++			};
++		};
++	};
++	fragment@9 {
++		target = <&i2c_arm>;
++		i2cbus: __overlay__ {
++			status = "okay";
++		};
++	};
++};