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8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
235 lines
6.8 KiB
Diff
235 lines
6.8 KiB
Diff
From 37f172b47784a4debc62cb71974eac303031e69c Mon Sep 17 00:00:00 2001
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From: pjx3 <pjx3@users.noreply.github.com>
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Date: Sun, 8 Aug 2021 20:09:46 +0100
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Subject: [PATCH] overlays: Add midi-uart{2345}-overlay.dts
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Added overlays for enabling MIDI baudrates on additional UARTs
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Signed-off-by: Pete Marshall <petemarshall303@gmail.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 4 ++
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arch/arm/boot/dts/overlays/README | 28 ++++++++++++++
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.../boot/dts/overlays/midi-uart2-overlay.dts | 37 ++++++++++++++++++
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.../boot/dts/overlays/midi-uart3-overlay.dts | 38 +++++++++++++++++++
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.../boot/dts/overlays/midi-uart4-overlay.dts | 38 +++++++++++++++++++
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.../boot/dts/overlays/midi-uart5-overlay.dts | 38 +++++++++++++++++++
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6 files changed, 183 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/midi-uart2-overlay.dts
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create mode 100644 arch/arm/boot/dts/overlays/midi-uart3-overlay.dts
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create mode 100644 arch/arm/boot/dts/overlays/midi-uart4-overlay.dts
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create mode 100644 arch/arm/boot/dts/overlays/midi-uart5-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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@@ -123,6 +123,10 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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merus-amp.dtbo \
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midi-uart0.dtbo \
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midi-uart1.dtbo \
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+ midi-uart2.dtbo \
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+ midi-uart3.dtbo \
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+ midi-uart4.dtbo \
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+ midi-uart5.dtbo \
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minipitft13.dtbo \
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miniuart-bt.dtbo \
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mmc.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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@@ -2088,6 +2088,34 @@ Load: dtoverlay=midi-uart1
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Params: <None>
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+Name: midi-uart2
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+Info: Configures UART2 (ttyAMA1) so that a requested 38.4kbaud actually gets
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+ 31.25kbaud, the frequency required for MIDI
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+Load: dtoverlay=midi-uart2
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+Params: <None>
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+
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+
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+Name: midi-uart3
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+Info: Configures UART3 (ttyAMA2) so that a requested 38.4kbaud actually gets
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+ 31.25kbaud, the frequency required for MIDI
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+Load: dtoverlay=midi-uart3
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+Params: <None>
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+
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+
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+Name: midi-uart4
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+Info: Configures UART4 (ttyAMA3) so that a requested 38.4kbaud actually gets
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+ 31.25kbaud, the frequency required for MIDI
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+Load: dtoverlay=midi-uart4
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+Params: <None>
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+
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+
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+Name: midi-uart5
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+Info: Configures UART5 (ttyAMA4) so that a requested 38.4kbaud actually gets
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+ 31.25kbaud, the frequency required for MIDI
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+Load: dtoverlay=midi-uart5
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+Params: <None>
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+
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+
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Name: minipitft13
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Info: Overlay for AdaFruit Mini Pi 1.3" TFT via SPI using fbtft driver.
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Load: dtoverlay=minipitft13,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/midi-uart2-overlay.dts
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@@ -0,0 +1,37 @@
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/clock/bcm2835.h>
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+
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+/*
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+ * Fake a higher clock rate to get a larger divisor, and thereby a lower
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+ * baudrate. The real clock is 48MHz, which we scale so that requesting
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+ * 38.4kHz results in an actual 31.25kHz.
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+ *
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+ * 48000000*38400/31250 = 58982400
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+ */
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+
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+/{
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ midi_clk: midi_clk2 {
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+ compatible = "fixed-clock";
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+ #clock-cells = <0>;
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+ clock-output-names = "uart2_pclk";
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+ clock-frequency = <58982400>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&uart2>;
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+ __overlay__ {
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+ clocks = <&midi_clk>,
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+ <&clocks BCM2835_CLOCK_VPU>;
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+ };
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+ };
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+};
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+
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/midi-uart3-overlay.dts
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@@ -0,0 +1,38 @@
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/clock/bcm2835.h>
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+
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+/*
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+ * Fake a higher clock rate to get a larger divisor, and thereby a lower
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+ * baudrate. The real clock is 48MHz, which we scale so that requesting
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+ * 38.4kHz results in an actual 31.25kHz.
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+ *
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+ * 48000000*38400/31250 = 58982400
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+ */
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+
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+/{
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ midi_clk: midi_clk3 {
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+ compatible = "fixed-clock";
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+ #clock-cells = <0>;
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+ clock-output-names = "uart3_pclk";
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+ clock-frequency = <58982400>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&uart3>;
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+ __overlay__ {
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+ clocks = <&midi_clk>,
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+ <&clocks BCM2835_CLOCK_VPU>;
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+ };
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+ };
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+};
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+
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+
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/midi-uart4-overlay.dts
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@@ -0,0 +1,38 @@
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/clock/bcm2835.h>
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+
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+/*
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+ * Fake a higher clock rate to get a larger divisor, and thereby a lower
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+ * baudrate. The real clock is 48MHz, which we scale so that requesting
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+ * 38.4kHz results in an actual 31.25kHz.
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+ *
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+ * 48000000*38400/31250 = 58982400
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+ */
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+
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+/{
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ midi_clk: midi_clk4 {
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+ compatible = "fixed-clock";
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+ #clock-cells = <0>;
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+ clock-output-names = "uart4_pclk";
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+ clock-frequency = <58982400>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&uart4>;
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+ __overlay__ {
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+ clocks = <&midi_clk>,
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+ <&clocks BCM2835_CLOCK_VPU>;
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+ };
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+ };
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+};
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+
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+
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/midi-uart5-overlay.dts
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@@ -0,0 +1,38 @@
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/clock/bcm2835.h>
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+
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+/*
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+ * Fake a higher clock rate to get a larger divisor, and thereby a lower
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+ * baudrate. The real clock is 48MHz, which we scale so that requesting
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+ * 38.4kHz results in an actual 31.25kHz.
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+ *
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+ * 48000000*38400/31250 = 58982400
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+ */
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+
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+/{
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ midi_clk: midi_clk5 {
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+ compatible = "fixed-clock";
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+ #clock-cells = <0>;
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+ clock-output-names = "uart5_pclk";
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+ clock-frequency = <58982400>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&uart5>;
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+ __overlay__ {
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+ clocks = <&midi_clk>,
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+ <&clocks BCM2835_CLOCK_VPU>;
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+ };
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+ };
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+};
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+
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+
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