target/linux/bcm27xx/patches-6.1/950-0465-overlays-Add-overlay-pwm1.patch

   1 From 6f5604a2d672ffb874f89f9ae276b565ae99dcc6 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Wed, 16 Nov 2022 14:54:08 +0000
   4 Subject: [PATCH] overlays: Add overlay pwm1
   5
   6 pwm1 enables the second PWM interface found on BCM2711. It can only
   7 be mapped to GPIOs 40 & 41.
   8
   9 See: https://forums.raspberrypi.com/viewtopic.php?t=342458
  10
  11 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  12 ---
  13  arch/arm/boot/dts/overlays/Makefile         |  1 +
  14  arch/arm/boot/dts/overlays/README           | 18 +++++++
  15  arch/arm/boot/dts/overlays/overlay_map.dts  |  4 ++
  16  arch/arm/boot/dts/overlays/pwm1-overlay.dts | 60 +++++++++++++++++++++
  17  4 files changed, 83 insertions(+)
  18  create mode 100644 arch/arm/boot/dts/overlays/pwm1-overlay.dts
  19
  20 --- a/arch/arm/boot/dts/overlays/Makefile
  21 +++ b/arch/arm/boot/dts/overlays/Makefile
  22 @@ -183,6 +183,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  23         pwm.dtbo \
  24         pwm-2chan.dtbo \
  25         pwm-ir-tx.dtbo \
  26 +       pwm1.dtbo \
  27         qca7000.dtbo \
  28         qca7000-uart0.dtbo \
  29         ramoops.dtbo \
  30 --- a/arch/arm/boot/dts/overlays/README
  31 +++ b/arch/arm/boot/dts/overlays/README
  32 @@ -3216,6 +3216,24 @@ Params: gpio_pin                Output G
  33          func                    Pin function (default 2 = Alt5)
  34
  35
  36 +Name:   pwm1
  37 +Info:   Configures one or two PWM channel on PWM1 (BCM2711 only)
  38 +        N.B.:
  39 +          1) The onboard analogue audio output uses both PWM channels.
  40 +          2) So be careful mixing audio and PWM.
  41 +        Note that even when only one pin is enabled, both channels are available
  42 +        from the PWM driver, so be careful to use the correct one.
  43 +Load:   dtoverlay=pwm1,<param>=<val>
  44 +Params: clock                   PWM clock frequency (informational)
  45 +        pins_40                 Enable channel 0 (PWM1_0) on GPIO 40
  46 +        pins_41                 Enable channel 1 (PWM1_1) on GPIO 41
  47 +        pins_40_41              Enable channels 0 (PWM1_0) and 1 (PW1_1) on
  48 +                                GPIOs 40 and 41 (default)
  49 +        pull_up                 Enable pull-ups on the PWM pins (default)
  50 +        pull_down               Enable pull-downs on the PWM pins
  51 +        pull_off                Disable pulls on the PWM pins
  52 +
  53 +
  54  Name:   qca7000
  55  Info:   in-tech's Evaluation Board for PLC Stamp micro
  56          This uses spi0 and a separate GPIO interrupt to connect the QCA7000.
  57 --- a/arch/arm/boot/dts/overlays/overlay_map.dts
  58 +++ b/arch/arm/boot/dts/overlays/overlay_map.dts
  59 @@ -77,6 +77,10 @@
  60                 renamed = "miniuart-bt";
  61         };
  62
  63 +       pwm1 {
  64 +               bcm2711;
  65 +       };
  66 +
  67         ramoops {
  68                 bcm2835;
  69                 bcm2711 = "ramoops-pi4";
  70 --- /dev/null
  71 +++ b/arch/arm/boot/dts/overlays/pwm1-overlay.dts
  72 @@ -0,0 +1,60 @@
  73 +/dts-v1/;
  74 +/plugin/;
  75 +
  76 +#include <dt-bindings/pinctrl/bcm2835.h>
  77 +
  78 +/ {
  79 +       compatible = "brcm,bcm2711";
  80 +
  81 +       fragment@0 {
  82 +               target = <&pins>;
  83 +               __overlay__ {
  84 +                       brcm,pins = <40 41>;
  85 +               };
  86 +       };
  87 +
  88 +       fragment@1 {
  89 +               target = <&pins>;
  90 +               __dormant__ {
  91 +                       brcm,pins = <40>;
  92 +               };
  93 +       };
  94 +
  95 +       fragment@2 {
  96 +               target = <&pins>;
  97 +               __dormant__ {
  98 +                       brcm,pins = <41>;
  99 +               };
 100 +       };
 101 +
 102 +       fragment@3 {
 103 +               target = <&gpio>;
 104 +               __overlay__ {
 105 +                       pins: pwm1_overlay_pins {
 106 +                               brcm,pins = <40 41>;
 107 +                               brcm,function = <BCM2835_FSEL_ALT0>;
 108 +                               brcm,pull = <BCM2835_PUD_UP>;
 109 +                       };
 110 +               };
 111 +       };
 112 +
 113 +       fragment@4 {
 114 +               target = <&pwm1>;
 115 +               pwm: __overlay__ {
 116 +                       status = "okay";
 117 +                       assigned-clock-rates = <100000000>;
 118 +                       pinctrl-names = "default";
 119 +                       pinctrl-0 = <&pins>;
 120 +               };
 121 +       };
 122 +
 123 +       __overrides__ {
 124 +               clock = <&pwm>, "assigned-clock-rates:0";
 125 +               pins_40_41 = <0>,"+0-1-2";
 126 +               pins_40 = <0>,"-0+1-2";
 127 +               pins_41 = <0>,"-0-1+2";
 128 +               pull_up = <&pins>, "brcm,pull:0=", <BCM2835_PUD_UP>;
 129 +               pull_down = <&pins>, "brcm,pull:0=", <BCM2835_PUD_DOWN>;
 130 +               pull_off = <&pins>, "brcm,pull:0=", <BCM2835_PUD_OFF>;
 131 +       };
 132 +};