target/linux/bcm27xx/patches-6.1/950-0818-overlays-Add-trickle-voltage-mv-parameter-to-RTCs.patch

   1 From 31822340129e3c4030500d7f30ce4d19bbf9dd40 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Mon, 24 Jul 2023 17:34:47 +0100
   4 Subject: [PATCH] overlays: Add trickle-voltage-mv parameter to RTCs
   5
   6 The RV3032 RTC requires an additional DT property to enable trickle
   7 charging. Add a parameter - trickle-voltage-mv - to the i2c-rtc
   8 and i2c-rtc-gpio overlays to set it.
   9
  10 See: https://github.com/raspberrypi/linux/issues/5547
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  13 ---
  14  arch/arm/boot/dts/overlays/README              | 12 ++++++++----
  15  arch/arm/boot/dts/overlays/i2c-rtc-common.dtsi |  2 ++
  16  2 files changed, 10 insertions(+), 4 deletions(-)
  17
  18 --- a/arch/arm/boot/dts/overlays/README
  19 +++ b/arch/arm/boot/dts/overlays/README
  20 @@ -1957,13 +1957,15 @@ Params: abx80x                  Select o
  21                                  "schottky" (ABx80x and RV1805 only)
  22
  23          trickle-resistor-ohms   Resistor value for trickle charge (DS1339,
  24 -                                ABx80x, RV1805, RV3028)
  25 +                                ABx80x, BQ32000, RV1805, RV3028, RV3032)
  26 +
  27 +        trickle-voltage-mv      Charge pump voltage for trickle charge (RV3032)
  28
  29          wakeup-source           Specify that the RTC can be used as a wakeup
  30                                  source
  31
  32          backup-switchover-mode  Backup power supply switch mode. Must be 0 for
  33 -                                off or 1 for Vdd < VBackup (RV3028 only)
  34 +                                off or 1 for Vdd < VBackup (RV3028, RV3032)
  35
  36
  37  Name:   i2c-rtc-gpio
  38 @@ -2027,13 +2029,15 @@ Params: abx80x                  Select o
  39                                  "schottky" (ABx80x and RV1805 only)
  40
  41          trickle-resistor-ohms   Resistor value for trickle charge (DS1339,
  42 -                                ABx80x, RV1805, RV3028)
  43 +                                ABx80x, BQ32000, RV1805, RV3028, RV3032)
  44 +
  45 +        trickle-voltage-mv      Charge pump voltage for trickle charge (RV3032)
  46
  47          wakeup-source           Specify that the RTC can be used as a wakeup
  48                                  source
  49
  50          backup-switchover-mode  Backup power supply switch mode. Must be 0 for
  51 -                                off or 1 for Vdd < VBackup (RV3028 only)
  52 +                                off or 1 for Vdd < VBackup (RV3028, RV3032)
  53
  54          i2c_gpio_sda            GPIO used for I2C data (default "23")
  55
  56 --- a/arch/arm/boot/dts/overlays/i2c-rtc-common.dtsi
  57 +++ b/arch/arm/boot/dts/overlays/i2c-rtc-common.dtsi
  58 @@ -339,8 +339,10 @@
  59                                         <&ds1340>,"trickle-resistor-ohms:0",
  60                                         <&abx80x>,"abracon,tc-resistor:0",
  61                                         <&rv3028>,"trickle-resistor-ohms:0",
  62 +                                       <&rv3032>,"trickle-resistor-ohms:0",
  63                                         <&rv1805>,"abracon,tc-resistor:0",
  64                                         <&bq32000>,"abracon,tc-resistor:0";
  65 +               trickle-voltage-mv = <&rv3032>,"trickle-voltage-millivolts:0";
  66                 backup-switchover-mode = <&rv3028>,"backup-switchover-mode:0";
  67                 wakeup-source = <&ds1339>,"wakeup-source?",
  68                                 <&ds3231>,"wakeup-source?",