target/linux/bcm27xx/patches-5.4/950-0957-overlays-Add-spi0-1cs-and-spi0-2cs.patch

   1 From 692af7a59fd6d9d3b64edbf028cd75b0096ef8c7 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Fri, 28 Aug 2020 12:55:41 +0100
   4 Subject: [PATCH] overlays: Add spi0-1cs and spi0-2cs
   5
   6 The spi0-1cs overlay allows the SPI0 interface to be run with a single
   7 CS line, which can be useful if GPIOs are in short supply. The no_miso
   8 parameter is for write-only devices that don't need the return channel,
   9 and again is there to free up a GPIO.
  10
  11 spi0-2cs is the new name for spi0-cs (now deprecated with a redirect
  12 to spi0-2cs), but with the addedd no_miso parameter.
  13
  14 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  15 ---
  16  arch/arm/boot/dts/overlays/Makefile           |  3 +-
  17  arch/arm/boot/dts/overlays/README             | 22 ++++++++--
  18  arch/arm/boot/dts/overlays/overlay_map.dts    |  4 ++
  19  .../boot/dts/overlays/spi0-1cs-overlay.dts    | 42 +++++++++++++++++++
  20  ...i0-cs-overlay.dts => spi0-2cs-overlay.dts} |  8 ++++
  21  5 files changed, 75 insertions(+), 4 deletions(-)
  22  create mode 100644 arch/arm/boot/dts/overlays/spi0-1cs-overlay.dts
  23  rename arch/arm/boot/dts/overlays/{spi0-cs-overlay.dts => spi0-2cs-overlay.dts} (79%)
  24
  25 --- a/arch/arm/boot/dts/overlays/Makefile
  26 +++ b/arch/arm/boot/dts/overlays/Makefile
  27 @@ -161,7 +161,8 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  28         spi-gpio35-39.dtbo \
  29         spi-gpio40-45.dtbo \
  30         spi-rtc.dtbo \
  31 -       spi0-cs.dtbo \
  32 +       spi0-1cs.dtbo \
  33 +       spi0-2cs.dtbo \
  34         spi1-1cs.dtbo \
  35         spi1-2cs.dtbo \
  36         spi1-3cs.dtbo \
  37 --- a/arch/arm/boot/dts/overlays/README
  38 +++ b/arch/arm/boot/dts/overlays/README
  39 @@ -2412,11 +2412,27 @@ Load:   dtoverlay=spi-rtc,<param>=<val>
  40  Params: pcf2123                 Select the PCF2123 device
  41
  42
  43 -Name:   spi0-cs
  44 -Info:   Allows the (software) CS pins for SPI0 to be changed
  45 -Load:   dtoverlay=spi0-cs,<param>=<val>
  46 +Name:   spi0-1cs
  47 +Info:   Only use one CS pin for SPI0
  48 +Load:   dtoverlay=spi0-1cs,<param>=<val>
  49 +Params: cs0_pin                 GPIO pin for CS0 (default 8)
  50 +        no_miso                 Don't claim and use the MISO pin (9), freeing
  51 +                                it for other uses.
  52 +
  53 +
  54 +Name:   spi0-2cs
  55 +Info:   Change the CS pins for SPI0
  56 +Load:   dtoverlay=spi0-2cs,<param>=<val>
  57  Params: cs0_pin                 GPIO pin for CS0 (default 8)
  58          cs1_pin                 GPIO pin for CS1 (default 7)
  59 +        no_miso                 Don't claim and use the MISO pin (9), freeing
  60 +                                it for other uses.
  61 +
  62 +
  63 +Name:   spi0-cs
  64 +Info:   This overlay has been renamed spi0-1cs, keeping spi0-cs as an
  65 +        alias for backwards compatibility.
  66 +Load:   <Deprecated>
  67
  68
  69  Name:   spi0-hw-cs
  70 --- a/arch/arm/boot/dts/overlays/overlay_map.dts
  71 +++ b/arch/arm/boot/dts/overlays/overlay_map.dts
  72 @@ -61,6 +61,10 @@
  73                 deprecated = "use sdio,bus_width=1,gpios_22_25";
  74         };
  75
  76 +       spi0-cs {
  77 +               renamed = "spi0-2cs";
  78 +       };
  79 +
  80         spi0-hw-cs {
  81                 deprecated = "no longer necessary";
  82         };
  83 --- /dev/null
  84 +++ b/arch/arm/boot/dts/overlays/spi0-1cs-overlay.dts
  85 @@ -0,0 +1,42 @@
  86 +/dts-v1/;
  87 +/plugin/;
  88 +
  89 +
  90 +/ {
  91 +       compatible = "brcm,bcm2835";
  92 +
  93 +       fragment@0 {
  94 +               target = <&spi0_cs_pins>;
  95 +               frag0: __overlay__ {
  96 +                       brcm,pins = <8>;
  97 +               };
  98 +       };
  99 +
 100 +       fragment@1 {
 101 +               target = <&spi0>;
 102 +               frag1: __overlay__ {
 103 +                       cs-gpios = <&gpio 8 1>;
 104 +                       status = "okay";
 105 +               };
 106 +       };
 107 +
 108 +       fragment@2 {
 109 +               target = <&spidev1>;
 110 +               __overlay__ {
 111 +                       status = "disabled";
 112 +               };
 113 +       };
 114 +
 115 +       fragment@3 {
 116 +               target = <&spi0_pins>;
 117 +               __dormant__ {
 118 +                       brcm,pins = <10 11>;
 119 +               };
 120 +       };
 121 +
 122 +       __overrides__ {
 123 +               cs0_pin  = <&frag0>,"brcm,pins:0",
 124 +                          <&frag1>,"cs-gpios:4";
 125 +               no_miso = <0>,"=3";
 126 +       };
 127 +};
 128 --- a/arch/arm/boot/dts/overlays/spi0-cs-overlay.dts
 129 +++ /dev/null
 130 @@ -1,29 +0,0 @@
 131 -/dts-v1/;
 132 -/plugin/;
 133 -
 134 -
 135 -/ {
 136 -       compatible = "brcm,bcm2835";
 137 -
 138 -       fragment@0 {
 139 -               target = <&spi0_cs_pins>;
 140 -               frag0: __overlay__ {
 141 -                       brcm,pins = <8 7>;
 142 -               };
 143 -       };
 144 -
 145 -       fragment@1 {
 146 -               target = <&spi0>;
 147 -               frag1: __overlay__ {
 148 -                       cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
 149 -                       status = "okay";
 150 -               };
 151 -       };
 152 -
 153 -       __overrides__ {
 154 -               cs0_pin  = <&frag0>,"brcm,pins:0",
 155 -                          <&frag1>,"cs-gpios:4";
 156 -               cs1_pin  = <&frag0>,"brcm,pins:4",
 157 -                          <&frag1>,"cs-gpios:16";
 158 -       };
 159 -};
 160 --- /dev/null
 161 +++ b/arch/arm/boot/dts/overlays/spi0-2cs-overlay.dts
 162 @@ -0,0 +1,37 @@
 163 +/dts-v1/;
 164 +/plugin/;
 165 +
 166 +
 167 +/ {
 168 +       compatible = "brcm,bcm2835";
 169 +
 170 +       fragment@0 {
 171 +               target = <&spi0_cs_pins>;
 172 +               frag0: __overlay__ {
 173 +                       brcm,pins = <8 7>;
 174 +               };
 175 +       };
 176 +
 177 +       fragment@1 {
 178 +               target = <&spi0>;
 179 +               frag1: __overlay__ {
 180 +                       cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
 181 +                       status = "okay";
 182 +               };
 183 +       };
 184 +
 185 +       fragment@2 {
 186 +               target = <&spi0_pins>;
 187 +               __dormant__ {
 188 +                       brcm,pins = <10 11>;
 189 +               };
 190 +       };
 191 +
 192 +       __overrides__ {
 193 +               cs0_pin  = <&frag0>,"brcm,pins:0",
 194 +                          <&frag1>,"cs-gpios:4";
 195 +               cs1_pin  = <&frag0>,"brcm,pins:4",
 196 +                          <&frag1>,"cs-gpios:16";
 197 +               no_miso = <0>,"=2";
 198 +       };
 199 +};