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