target/linux/bcm27xx/patches-5.15/950-0566-overlays-Additional-parameters-for-gpio-poweroff.patch

   1 From ae5bd19ff96560fb75a75c7d2374bed60bbd9669 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.com>
   3 Date: Thu, 11 Nov 2021 10:24:02 +0000
   4 Subject: [PATCH] overlays: Additional parameters for gpio-poweroff
   5
   6 The gpio-poweroff driver supports active-delay-ms and inactive-delay-ms
   7 properties. Add parameters to set these parameters - active_delay_ms
   8 and inactive_delay_ms.
   9
  10 See: https://forums.raspberrypi.com/viewtopic.php?t=323508
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.com>
  13 ---
  14  arch/arm/boot/dts/overlays/README                    | 7 +++++++
  15  arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts | 2 ++
  16  2 files changed, 9 insertions(+)
  17
  18 --- a/arch/arm/boot/dts/overlays/README
  19 +++ b/arch/arm/boot/dts/overlays/README
  20 @@ -1155,6 +1155,11 @@ Info:   Drives a GPIO high or low on pow
  21          or reboot). This also disables the ability to trigger a boot by driving
  22          GPIO3 low.
  23
  24 +        The GPIO starts in an inactive state. At poweroff time it is driven
  25 +        active for 100ms, then inactive for 100ms, then active again. It is
  26 +        safe to remove the power at any point after the initial activation of
  27 +        the GPIO.
  28 +
  29          Users of this overlay are required to provide an external mechanism to
  30          switch off the power supply when signalled - failure to do so results
  31          in a kernel BUG, increased power consumption and undefined behaviour.
  32 @@ -1170,6 +1175,8 @@ Params: gpiopin                 GPIO for
  33          input                   Set if the gpio pin should be configured as
  34                                  an input.
  35          export                  Set to export the configured pin to sysfs
  36 +        active_delay_ms         Initial GPIO active period (default 100)
  37 +        inactive_delay_ms       Subsequent GPIO inactive period (default 100)
  38          timeout_ms              Specify (in ms) how long the kernel waits for
  39                                  power-down before issuing a WARN (default 3000).
  40
  41 --- a/arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts
  42 +++ b/arch/arm/boot/dts/overlays/gpio-poweroff-overlay.dts
  43 @@ -33,5 +33,7 @@
  44                 input =         <&power_ctrl>,"input?";
  45                 export =        <&power_ctrl>,"export?";
  46                 timeout_ms =    <&power_ctrl>,"timeout-ms:0";
  47 +               active_delay_ms = <&power_ctrl>,"active-delay-ms:0";
  48 +               inactive_delay_ms = <&power_ctrl>,"inactive-delay-ms:0";
  49         };
  50  };