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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
63 lines
3.2 KiB
Diff
63 lines
3.2 KiB
Diff
From 5f9fcc99c517a517e8d74ce001fc5bc2648f0e59 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
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Date: Thu, 30 Apr 2020 19:41:10 +0200
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Subject: [PATCH] overlays: gpio-shutdown: Add information for
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Raspberry Pi 1 Model B rev 1
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Raspberry Pi 1 Model B rev 1 uses GPIO1 for power-up instead of GPIO3.
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---
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arch/arm/boot/dts/overlays/README | 10 ++++++++--
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arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts | 6 ++++--
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2 files changed, 12 insertions(+), 4 deletions(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -883,9 +883,14 @@ Info: Initiates a shutdown when GPIO p
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can be powered up again by driving GPIO3 low. The default
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configuration uses GPIO3 with a pullup, so if you connect a
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button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
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- you get a shutdown and power-up button.
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+ you get a shutdown and power-up button. Please note that
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+ Raspberry Pi 1 Model B rev 1 uses GPIO1 instead of GPIO3.
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Load: dtoverlay=gpio-shutdown,<param>=<val>
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Params: gpio_pin GPIO pin to trigger on (default 3)
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+ For Raspberry Pi 1 Model B rev 1 set this
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+ explicitly to value 1, e.g.:
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+
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+ dtoverlay=gpio-shutdown,gpio_pin=1
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active_low When this is 1 (active low), a falling
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edge generates a key down event and a
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@@ -897,7 +902,8 @@ Params: gpio_pin GPIO pin
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Default is "up".
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Note that the default pin (GPIO3) has an
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- external pullup.
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+ external pullup. Same applies for GPIO1
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+ on Raspberry Pi 1 Model B rev 1.
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debounce Specify the debounce interval in milliseconds
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(default 100)
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--- a/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
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@@ -4,7 +4,9 @@
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// This overlay sets up an input device that generates KEY_POWER events
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// when a given GPIO pin changes. It defaults to using GPIO3, which can
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-// also be used to wake up (start) the Rpi again after shutdown. Since
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+// also be used to wake up (start) the Rpi again after shutdown.
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+// Raspberry Pi 1 Model B rev 1 can be wake up only by GPIO1 pin, so for
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+// these boards change default GPIO pin to 1 via gpio_pin parameter. Since
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// wakeup is active-low, this defaults to active-low with a pullup
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// enabled, but all of this can be changed using overlay parameters (but
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// note that GPIO3 has an external pullup on at least some boards).
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@@ -71,7 +73,7 @@
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// Allow changing the internal pullup/down state. 0 = none, 1 = pulldown, 2 = pullup
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// Note that GPIO3 and GPIO2 are the I2c pins and have an external pullup (at least
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- // on some boards).
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+ // on some boards). Same applies for GPIO1 on Raspberry Pi 1 Model B rev 1.
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gpio_pull = <&pin_state>,"brcm,pull:0";
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// Allow setting the active_low flag. 0 = active high, 1 = active low
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