target/linux/bcm27xx/patches-5.10/950-0578-overlays-spi-rtc-Add-ds3232-and-ds3234.patch

   1 From 8273b9e71c1f5c1f6f74faac21de64bf42686817 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Mon, 19 Apr 2021 10:33:24 +0100
   4 Subject: [PATCH] overlays: spi-rtc: Add ds3232 and ds3234
   5
   6 Extend the spi-rtc overlay to support the ds3232 and ds3234 RTCs, as
   7 well as adding parameters to select difference SPI controllers and
   8 chip selects.
   9
  10 N.B. The default CS is now active-low - use the "cs_high" parameter to
  11 override this.
  12
  13 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  14 ---
  15  arch/arm/boot/dts/overlays/README             | 12 +++-
  16  .../arm/boot/dts/overlays/spi-rtc-overlay.dts | 58 ++++++++++++++++---
  17  2 files changed, 61 insertions(+), 9 deletions(-)
  18
  19 --- a/arch/arm/boot/dts/overlays/README
  20 +++ b/arch/arm/boot/dts/overlays/README
  21 @@ -2689,7 +2689,17 @@ Params: <None>
  22  Name:   spi-rtc
  23  Info:   Adds support for a number of SPI Real Time Clock devices
  24  Load:   dtoverlay=spi-rtc,<param>=<val>
  25 -Params: pcf2123                 Select the PCF2123 device
  26 +Params: ds3232                  Select the DS3232 device
  27 +        ds3234                  Select the DS3234 device
  28 +        pcf2123                 Select the PCF2123 device
  29 +
  30 +        spi0_0                  Use spi0.0 (default)
  31 +        spi0_1                  Use spi0.1
  32 +        spi1_0                  Use spi1.0
  33 +        spi1_1                  Use spi1.1
  34 +        spi2_0                  Use spi2.0
  35 +        spi2_1                  Use spi2.1
  36 +        cs_high                 This device requires an active-high CS
  37
  38
  39  Name:   spi0-1cs
  40 --- a/arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
  41 +++ b/arch/arm/boot/dts/overlays/spi-rtc-overlay.dts
  42 @@ -1,3 +1,4 @@
  43 +// Definitions for several SPI-based Real Time Clocks
  44  /dts-v1/;
  45  /plugin/;
  46
  47 @@ -5,29 +6,70 @@
  48         compatible = "brcm,bcm2835";
  49
  50         fragment@0 {
  51 -               target = <&spidev0>;
  52 +               target = <&rtc>;
  53                 __dormant__ {
  54 -                       status = "disabled";
  55 +                       compatible = "maxim,ds3232";
  56                 };
  57         };
  58
  59         fragment@1 {
  60 -               target = <&spi0>;
  61 +               target = <&rtc>;
  62 +               __dormant__ {
  63 +                       compatible = "maxim,ds3234";
  64 +               };
  65 +       };
  66 +
  67 +       fragment@2 {
  68 +               target = <&rtc>;
  69                 __dormant__ {
  70 +                       compatible = "nxp,rtc-pcf2123";
  71 +               };
  72 +       };
  73 +
  74 +       spidev: fragment@100 {
  75 +               target = <&spidev0>;
  76 +               __overlay__ {
  77 +                       status = "disabled";
  78 +               };
  79 +       };
  80 +
  81 +       frag101: fragment@101 {
  82 +               target = <&spi0>;
  83 +               __overlay__ {
  84                         #address-cells = <1>;
  85                         #size-cells = <0>;
  86                         status = "okay";
  87
  88 -                       rtc-pcf2123@0 {
  89 -                               compatible = "nxp,rtc-pcf2123";
  90 -                               spi-max-frequency = <5000000>;
  91 -                               spi-cs-high = <1>;
  92 +                       rtc: rtc@0 {
  93                                 reg = <0>;
  94 +                               spi-max-frequency = <5000000>;
  95                         };
  96                 };
  97         };
  98
  99         __overrides__ {
 100 -               pcf2123 = <0>, "=0=1";
 101 +               spi0_0 = <&spidev>, "target:0=",<&spidev0>,
 102 +                        <&frag101>, "target:0=",<&spi0>,
 103 +                        <&rtc>, "reg:0=0";
 104 +               spi0_1 = <&spidev>, "target:0=",<&spidev1>,
 105 +                        <&frag101>, "target:0=",<&spi0>,
 106 +                        <&rtc>, "reg:0=1";
 107 +               spi1_0 = <0>,"-100",
 108 +                        <&frag101>, "target:0=",<&spi1>,
 109 +                        <&rtc>, "reg:0=0";
 110 +               spi1_1 = <0>,"-100",
 111 +                        <&frag101>, "target:0=",<&spi1>,
 112 +                        <&rtc>, "reg:0=1";
 113 +               spi2_0 = <0>,"-100",
 114 +                        <&frag101>, "target:0=",<&spi2>,
 115 +                        <&rtc>, "reg:0=0";
 116 +               spi2_1 = <0>,"-100",
 117 +                        <&frag101>, "target:0=",<&spi2>,
 118 +                        <&rtc>, "reg:0=1";
 119 +               cs_high = <&rtc>, "spi-cs-high?";
 120 +
 121 +               ds3232 = <0>,"+0";
 122 +               ds3234 = <0>,"+1";
 123 +               pcf2123 = <0>,"+2";
 124         };
 125  };