From 98e84cdbce80fe8a8177fb1f42800af76b3da9ac Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 26 Jun 2015 08:50:11 +0100
Subject: [PATCH 098/171] BCM270X_DT: Add overlay to enable uart1
N.B. The UART1 clock is derived from the core clock. The firmware
will update clock-frequency if core_freq is set, but be aware
that unless force_turbo=1 while overclocking then the baud rate
will vary with ARM activity.
---
arch/arm/boot/dts/bcm2708-rpi-b-plus.dts | 1 +
arch/arm/boot/dts/bcm2708-rpi-b.dts | 1 +
arch/arm/boot/dts/bcm2708-rpi-cm.dts | 1 +
arch/arm/boot/dts/bcm2709-rpi-2-b.dts | 1 +
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 8 ++++++
arch/arm/boot/dts/overlays/uart1-overlay.dts | 38 ++++++++++++++++++++++++++++
arch/arm/configs/bcm2709_defconfig | 2 +-
arch/arm/configs/bcmrpi_defconfig | 2 +-
9 files changed, 53 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/boot/dts/overlays/uart1-overlay.dts
--- a/arch/arm/boot/dts/bcm2708-rpi-b-plus.dts
+++ b/arch/arm/boot/dts/bcm2708-rpi-b-plus.dts
@@ -103,6 +103,7 @@
__overrides__ {
uart0 = <&uart0>,"status";
uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ uart1_clkrate = <&uart1>,"clock-frequency:0";
i2s = <&i2s>,"status";
spi = <&spi0>,"status";
i2c0 = <&i2c0>,"status";
--- a/arch/arm/boot/dts/bcm2708-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2708-rpi-b.dts
@@ -97,6 +97,7 @@
__overrides__ {
uart0 = <&uart0>,"status";
uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ uart1_clkrate = <&uart1>,"clock-frequency:0";
i2s = <&i2s>,"status";
spi = <&spi0>,"status";
i2c0 = <&i2c0>,"status";
--- a/arch/arm/boot/dts/bcm2708-rpi-cm.dts
+++ b/arch/arm/boot/dts/bcm2708-rpi-cm.dts
@@ -79,6 +79,7 @@
__overrides__ {
uart0 = <&uart0>,"status";
uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ uart1_clkrate = <&uart1>,"clock-frequency:0";
i2s = <&i2s>,"status";
spi = <&spi0>,"status";
i2c0 = <&i2c0>,"status";
--- a/arch/arm/boot/dts/bcm2709-rpi-2-b.dts
+++ b/arch/arm/boot/dts/bcm2709-rpi-2-b.dts
@@ -103,6 +103,7 @@
__overrides__ {
uart0 = <&uart0>,"status";
uart0_clkrate = <&clk_uart0>,"clock-frequency:0";
+ uart1_clkrate = <&uart1>,"clock-frequency:0";
i2s = <&i2s>,"status";
spi = <&spi0>,"status";
i2c0 = <&i2c0>,"status";
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -42,6 +42,7 @@ dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay
dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += tinylcd35-overlay.dtb
+dtb-$(RPI_DT_OVERLAYS) += uart1-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += w1-gpio-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += w1-gpio-pullup-overlay.dtb
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -489,6 +489,14 @@ Params: speed Display
dtoverlay=tinylcd35,touch,touchgpio=3
+Name: uart1
+Info: Enable uart1 in place of uart0
+Load: dtoverlay=uart1,<param>=<val>
+Params: txd1_pin GPIO pin for TXD1 (14, 32 or 40 - default 14)
+
+ rxd1_pin GPIO pin for RXD1 (15, 33 or 41 - default 15)
+
+
Name: w1-gpio
Info: Configures the w1-gpio Onewire interface module.
Use this overlay if you *don't* need a GPIO to drive an external pullup.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/uart1-overlay.dts
@@ -0,0 +1,38 @@
+/dts-v1/;
+/plugin/;
+
+/{
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target = <&uart1>;
+ __overlay__ {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart1_pins>;
+ status = "okay";
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ uart1_pins: uart1_pins {
+ brcm,pins = <14 15>;
+ brcm,function = <2>; /* alt5 */
+ brcm,pull = <0 2>;
+ };
+ };
+ };
+
+ fragment@2 {
+ target-path = "/chosen";
+ __overlay__ {
+ bootargs = "8250.nr_uarts=1";
+ };
+ };
+
+ __overrides__ {
+ txd1_pin = <&uart1_pins>,"brcm,pins:0";
+ rxd1_pin = <&uart1_pins>,"brcm,pins:4";
+ };
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -562,7 +562,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
# CONFIG_SERIAL_8250_DMA is not set
CONFIG_SERIAL_8250_NR_UARTS=1
-CONFIG_SERIAL_8250_RUNTIME_UARTS=1
+CONFIG_SERIAL_8250_RUNTIME_UARTS=0
CONFIG_SERIAL_AMBA_PL011=y
CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
CONFIG_SERIAL_OF_PLATFORM=y
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -555,7 +555,7 @@ CONFIG_SERIAL_8250=y
CONFIG_SERIAL_8250_CONSOLE=y
# CONFIG_SERIAL_8250_DMA is not set
CONFIG_SERIAL_8250_NR_UARTS=1
-CONFIG_SERIAL_8250_RUNTIME_UARTS=1
+CONFIG_SERIAL_8250_RUNTIME_UARTS=0
CONFIG_SERIAL_AMBA_PL011=y
CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
CONFIG_SERIAL_OF_PLATFORM=y