target/linux/bcm27xx/patches-5.10/950-0732-overlays-Add-midi-uart-2345-overlay.dts.patch

   1 From 37f172b47784a4debc62cb71974eac303031e69c Mon Sep 17 00:00:00 2001
   2 From: pjx3 <pjx3@users.noreply.github.com>
   3 Date: Sun, 8 Aug 2021 20:09:46 +0100
   4 Subject: [PATCH] overlays: Add midi-uart{2345}-overlay.dts
   5
   6 Added overlays for enabling MIDI baudrates on additional UARTs
   7
   8 Signed-off-by: Pete Marshall <petemarshall303@gmail.com>
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile           |  4 ++
  11  arch/arm/boot/dts/overlays/README             | 28 ++++++++++++++
  12  .../boot/dts/overlays/midi-uart2-overlay.dts  | 37 ++++++++++++++++++
  13  .../boot/dts/overlays/midi-uart3-overlay.dts  | 38 +++++++++++++++++++
  14  .../boot/dts/overlays/midi-uart4-overlay.dts  | 38 +++++++++++++++++++
  15  .../boot/dts/overlays/midi-uart5-overlay.dts  | 38 +++++++++++++++++++
  16  6 files changed, 183 insertions(+)
  17  create mode 100644 arch/arm/boot/dts/overlays/midi-uart2-overlay.dts
  18  create mode 100644 arch/arm/boot/dts/overlays/midi-uart3-overlay.dts
  19  create mode 100644 arch/arm/boot/dts/overlays/midi-uart4-overlay.dts
  20  create mode 100644 arch/arm/boot/dts/overlays/midi-uart5-overlay.dts
  21
  22 --- a/arch/arm/boot/dts/overlays/Makefile
  23 +++ b/arch/arm/boot/dts/overlays/Makefile
  24 @@ -123,6 +123,10 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  25         merus-amp.dtbo \
  26         midi-uart0.dtbo \
  27         midi-uart1.dtbo \
  28 +       midi-uart2.dtbo \
  29 +       midi-uart3.dtbo \
  30 +       midi-uart4.dtbo \
  31 +       midi-uart5.dtbo \
  32         minipitft13.dtbo \
  33         miniuart-bt.dtbo \
  34         mmc.dtbo \
  35 --- a/arch/arm/boot/dts/overlays/README
  36 +++ b/arch/arm/boot/dts/overlays/README
  37 @@ -2088,6 +2088,34 @@ Load:   dtoverlay=midi-uart1
  38  Params: <None>
  39
  40
  41 +Name:   midi-uart2
  42 +Info:   Configures UART2 (ttyAMA1) so that a requested 38.4kbaud actually gets
  43 +        31.25kbaud, the frequency required for MIDI
  44 +Load:   dtoverlay=midi-uart2
  45 +Params: <None>
  46 +
  47 +
  48 +Name:   midi-uart3
  49 +Info:   Configures UART3 (ttyAMA2) so that a requested 38.4kbaud actually gets
  50 +        31.25kbaud, the frequency required for MIDI
  51 +Load:   dtoverlay=midi-uart3
  52 +Params: <None>
  53 +
  54 +
  55 +Name:   midi-uart4
  56 +Info:   Configures UART4 (ttyAMA3) so that a requested 38.4kbaud actually gets
  57 +        31.25kbaud, the frequency required for MIDI
  58 +Load:   dtoverlay=midi-uart4
  59 +Params: <None>
  60 +
  61 +
  62 +Name:   midi-uart5
  63 +Info:   Configures UART5 (ttyAMA4) so that a requested 38.4kbaud actually gets
  64 +        31.25kbaud, the frequency required for MIDI
  65 +Load:   dtoverlay=midi-uart5
  66 +Params: <None>
  67 +
  68 +
  69  Name:   minipitft13
  70  Info:   Overlay for AdaFruit Mini Pi 1.3" TFT via SPI using fbtft driver.
  71  Load:   dtoverlay=minipitft13,<param>=<val>
  72 --- /dev/null
  73 +++ b/arch/arm/boot/dts/overlays/midi-uart2-overlay.dts
  74 @@ -0,0 +1,37 @@
  75 +/dts-v1/;
  76 +/plugin/;
  77 +
  78 +#include <dt-bindings/clock/bcm2835.h>
  79 +
  80 +/*
  81 + * Fake a higher clock rate to get a larger divisor, and thereby a lower
  82 + * baudrate. The real clock is 48MHz, which we scale so that requesting
  83 + * 38.4kHz results in an actual 31.25kHz.
  84 + *
  85 + *   48000000*38400/31250 = 58982400
  86 + */
  87 +
  88 +/{
  89 +        compatible = "brcm,bcm2835";
  90 +
  91 +        fragment@0 {
  92 +                target-path = "/";
  93 +                __overlay__ {
  94 +                        midi_clk: midi_clk2 {
  95 +                                compatible = "fixed-clock";
  96 +                                #clock-cells = <0>;
  97 +                                clock-output-names = "uart2_pclk";
  98 +                                clock-frequency = <58982400>;
  99 +                        };
 100 +                };
 101 +        };
 102 +
 103 +        fragment@1 {
 104 +                target = <&uart2>;
 105 +                __overlay__ {
 106 +                        clocks = <&midi_clk>,
 107 +                                 <&clocks BCM2835_CLOCK_VPU>;
 108 +                };
 109 +        };
 110 +};
 111 +
 112 --- /dev/null
 113 +++ b/arch/arm/boot/dts/overlays/midi-uart3-overlay.dts
 114 @@ -0,0 +1,38 @@
 115 +/dts-v1/;
 116 +/plugin/;
 117 +
 118 +#include <dt-bindings/clock/bcm2835.h>
 119 +
 120 +/*
 121 + * Fake a higher clock rate to get a larger divisor, and thereby a lower
 122 + * baudrate. The real clock is 48MHz, which we scale so that requesting
 123 + * 38.4kHz results in an actual 31.25kHz.
 124 + *
 125 + *   48000000*38400/31250 = 58982400
 126 + */
 127 +
 128 +/{
 129 +        compatible = "brcm,bcm2835";
 130 +
 131 +        fragment@0 {
 132 +                target-path = "/";
 133 +                __overlay__ {
 134 +                        midi_clk: midi_clk3 {
 135 +                                compatible = "fixed-clock";
 136 +                                #clock-cells = <0>;
 137 +                                clock-output-names = "uart3_pclk";
 138 +                                clock-frequency = <58982400>;
 139 +                        };
 140 +                };
 141 +        };
 142 +
 143 +        fragment@1 {
 144 +                target = <&uart3>;
 145 +                __overlay__ {
 146 +                        clocks = <&midi_clk>,
 147 +                                 <&clocks BCM2835_CLOCK_VPU>;
 148 +                };
 149 +        };
 150 +};
 151 +
 152 +
 153 --- /dev/null
 154 +++ b/arch/arm/boot/dts/overlays/midi-uart4-overlay.dts
 155 @@ -0,0 +1,38 @@
 156 +/dts-v1/;
 157 +/plugin/;
 158 +
 159 +#include <dt-bindings/clock/bcm2835.h>
 160 +
 161 +/*
 162 + * Fake a higher clock rate to get a larger divisor, and thereby a lower
 163 + * baudrate. The real clock is 48MHz, which we scale so that requesting
 164 + * 38.4kHz results in an actual 31.25kHz.
 165 + *
 166 + *   48000000*38400/31250 = 58982400
 167 + */
 168 +
 169 +/{
 170 +        compatible = "brcm,bcm2835";
 171 +
 172 +        fragment@0 {
 173 +                target-path = "/";
 174 +                __overlay__ {
 175 +                        midi_clk: midi_clk4 {
 176 +                                compatible = "fixed-clock";
 177 +                                #clock-cells = <0>;
 178 +                                clock-output-names = "uart4_pclk";
 179 +                                clock-frequency = <58982400>;
 180 +                        };
 181 +                };
 182 +        };
 183 +
 184 +        fragment@1 {
 185 +                target = <&uart4>;
 186 +                __overlay__ {
 187 +                        clocks = <&midi_clk>,
 188 +                                 <&clocks BCM2835_CLOCK_VPU>;
 189 +                };
 190 +        };
 191 +};
 192 +
 193 +
 194 --- /dev/null
 195 +++ b/arch/arm/boot/dts/overlays/midi-uart5-overlay.dts
 196 @@ -0,0 +1,38 @@
 197 +/dts-v1/;
 198 +/plugin/;
 199 +
 200 +#include <dt-bindings/clock/bcm2835.h>
 201 +
 202 +/*
 203 + * Fake a higher clock rate to get a larger divisor, and thereby a lower
 204 + * baudrate. The real clock is 48MHz, which we scale so that requesting
 205 + * 38.4kHz results in an actual 31.25kHz.
 206 + *
 207 + *   48000000*38400/31250 = 58982400
 208 + */
 209 +
 210 +/{
 211 +        compatible = "brcm,bcm2835";
 212 +
 213 +        fragment@0 {
 214 +                target-path = "/";
 215 +                __overlay__ {
 216 +                        midi_clk: midi_clk5 {
 217 +                                compatible = "fixed-clock";
 218 +                                #clock-cells = <0>;
 219 +                                clock-output-names = "uart5_pclk";
 220 +                                clock-frequency = <58982400>;
 221 +                        };
 222 +                };
 223 +        };
 224 +
 225 +        fragment@1 {
 226 +                target = <&uart5>;
 227 +                __overlay__ {
 228 +                        clocks = <&midi_clk>,
 229 +                                 <&clocks BCM2835_CLOCK_VPU>;
 230 +                };
 231 +        };
 232 +};
 233 +
 234 +