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82 lines
2.3 KiB
82 lines
2.3 KiB
6 years ago
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From f0f4af3ddb0fc5ea529c0147ebf8be47b1a80335 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 12 Jan 2018 09:15:01 +0000
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Subject: [PATCH 159/454] overlays: Add uart0 overlay to change pin usage
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 13 +++++++-
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arch/arm/boot/dts/overlays/uart0-overlay.dts | 32 ++++++++++++++++++++
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3 files changed, 45 insertions(+), 1 deletion(-)
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create mode 100755 arch/arm/boot/dts/overlays/uart0-overlay.dts
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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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@@ -117,6 +117,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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spi2-2cs.dtbo \
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spi2-3cs.dtbo \
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tinylcd35.dtbo \
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+ uart0.dtbo \
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uart1.dtbo \
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vc4-fkms-v3d.dtbo \
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vc4-kms-v3d.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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@@ -1671,8 +1671,19 @@ Params: speed Display
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dtoverlay=tinylcd35,touch,touchgpio=3
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+Name: uart0
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+Info: Change the pin usage of uart0
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+Load: dtoverlay=uart0,<param>=<val>
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+Params: txd0_pin GPIO pin for TXD0 (14, 32 or 36 - default 14)
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+
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+ rxd0_pin GPIO pin for RXD0 (15, 33 or 37 - default 15)
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+
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+ pin_func Alternative pin function - 4(Alt0) for 14&15,
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+ 7(Alt3) for 32&33, 6(Alt2) for 36&37
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+
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+
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Name: uart1
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-Info: Enable uart1 in place of uart0
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+Info: Change the pin usage of uart1
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Load: dtoverlay=uart1,<param>=<val>
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Params: txd1_pin GPIO pin for TXD1 (14, 32 or 40 - default 14)
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/uart0-overlay.dts
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@@ -0,0 +1,32 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&uart0>;
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+ __overlay__ {
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&uart0_pins>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ uart0_pins: uart0_pins {
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+ brcm,pins = <14 15>;
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+ brcm,function = <4>; /* alt0 */
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+ brcm,pull = <0 2>;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ txd0_pin = <&uart0_pins>,"brcm,pins:0";
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+ rxd0_pin = <&uart0_pins>,"brcm,pins:4";
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+ pin_func = <&uart0_pins>,"brcm,function:0";
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+ };
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+};
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