git.openwrt.org Git - openwrt/openwrt.git/blob

   1 From 5f9fcc99c517a517e8d74ce001fc5bc2648f0e59 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
   3 Date: Thu, 30 Apr 2020 19:41:10 +0200
   4 Subject: [PATCH] overlays: gpio-shutdown: Add information for
   5  Raspberry Pi 1 Model B rev 1
   6
   7 Raspberry Pi 1 Model B rev 1 uses GPIO1 for power-up instead of GPIO3.
   8 ---
   9  arch/arm/boot/dts/overlays/README                    | 10 ++++++++--
  10  arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts |  6 ++++--
  11  2 files changed, 12 insertions(+), 4 deletions(-)
  12
  13 --- a/arch/arm/boot/dts/overlays/README
  14 +++ b/arch/arm/boot/dts/overlays/README
  15 @@ -883,9 +883,14 @@ Info:   Initiates a shutdown when GPIO p
  16          can be powered up again by driving GPIO3 low. The default
  17          configuration uses GPIO3 with a pullup, so if you connect a
  18          button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
  19 -        you get a shutdown and power-up button.
  20 +        you get a shutdown and power-up button. Please note that
  21 +        Raspberry Pi 1 Model B rev 1 uses GPIO1 instead of GPIO3.
  22  Load:   dtoverlay=gpio-shutdown,<param>=<val>
  23  Params: gpio_pin                GPIO pin to trigger on (default 3)
  24 +                                For Raspberry Pi 1 Model B rev 1 set this
  25 +                                explicitly to value 1, e.g.:
  26 +
  27 +                                    dtoverlay=gpio-shutdown,gpio_pin=1
  28
  29          active_low              When this is 1 (active low), a falling
  30                                  edge generates a key down event and a
  31 @@ -897,7 +902,8 @@ Params: gpio_pin                GPIO pin
  32                                  Default is "up".
  33
  34                                  Note that the default pin (GPIO3) has an
  35 -                                external pullup.
  36 +                                external pullup. Same applies for GPIO1
  37 +                                on Raspberry Pi 1 Model B rev 1.
  38
  39          debounce                Specify the debounce interval in milliseconds
  40                                  (default 100)
  41 --- a/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
  42 +++ b/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
  43 @@ -4,7 +4,9 @@
  44
  45  // This overlay sets up an input device that generates KEY_POWER events
  46  // when a given GPIO pin changes. It defaults to using GPIO3, which can
  47 -// also be used to wake up (start) the Rpi again after shutdown. Since
  48 +// also be used to wake up (start) the Rpi again after shutdown.
  49 +// Raspberry Pi 1 Model B rev 1 can be wake up only by GPIO1 pin, so for
  50 +// these boards change default GPIO pin to 1 via gpio_pin parameter. Since
  51  // wakeup is active-low, this defaults to active-low with a pullup
  52  // enabled, but all of this can be changed using overlay parameters (but
  53  // note that GPIO3 has an external pullup on at least some boards).
  54 @@ -71,7 +73,7 @@
  55
  56                 // Allow changing the internal pullup/down state. 0 = none, 1 = pulldown, 2 = pullup
  57                 // Note that GPIO3 and GPIO2 are the I2c pins and have an external pullup (at least
  58 -                // on some boards).
  59 +               // on some boards). Same applies for GPIO1 on Raspberry Pi 1 Model B rev 1.
  60                 gpio_pull = <&pin_state>,"brcm,pull:0";
  61
  62                 // Allow setting the active_low flag. 0 = active high, 1 = active low