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92 lines
3.6 KiB
Diff
92 lines
3.6 KiB
Diff
From f2c24ce7e03d059fa9f674d8ebf6286e8f0c38b6 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Wed, 5 Dec 2018 11:56:40 +0000
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Subject: [PATCH] overlays: Update README with removal of lirc-rpi
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/README | 57 ++++++++++++-------------------
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1 file changed, 21 insertions(+), 36 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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@@ -56,23 +56,29 @@ have its contents deleted (or commented
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Using Overlays
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==============
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-Overlays are loaded using the "dtoverlay" directive. As an example, consider
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-the popular lirc-rpi module, the Linux Infrared Remote Control driver. In the
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-pre-DT world this would be loaded from /etc/modules, with an explicit
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-"modprobe lirc-rpi" command, or programmatically by lircd. With DT enabled,
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-this becomes a line in config.txt:
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-
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- dtoverlay=lirc-rpi
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-
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-This causes the file /boot/overlays/lirc-rpi.dtbo to be loaded. By
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-default it will use GPIOs 17 (out) and 18 (in), but this can be modified using
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-DT parameters:
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-
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- dtoverlay=lirc-rpi,gpio_out_pin=17,gpio_in_pin=13
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-
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-Parameters always have default values, although in some cases (e.g. "w1-gpio")
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-it is necessary to provided multiple overlays in order to get the desired
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-behaviour. See the list of overlays below for a description of the parameters
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+Overlays are loaded using the "dtoverlay" config.txt setting. As an example,
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+consider I2C Real Time Clock drivers. In the pre-DT world these would be loaded
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+by writing a magic string comprising a device identifier and an I2C address to
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+a special file in /sys/class/i2c-adapter, having first loaded the driver for
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+the I2C interface and the RTC device - something like this:
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+
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+ modprobe i2c-bcm2835
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+ modprobe rtc-ds1307
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+ echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device
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+
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+With DT enabled, this becomes a line in config.txt:
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+
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+ dtoverlay=i2c-rtc,ds1307
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+
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+This causes the file /boot/overlays/i2c-rtc.dtbo to be loaded and a "node"
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+describing the DS1307 I2C device to be added to the Device Tree for the Pi. By
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+default it usees address 0x68, but this can be modified with an additional DT
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+parameter:
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+
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+ dtoverlay=i2c-rtc,ds1307,addr=0x68
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+
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+Parameters usually have default values, although certain parameters are
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+mandatory. See the list of overlays below for a description of the parameters
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and their defaults.
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The Overlay and Parameter Reference
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@@ -1135,29 +1141,8 @@ Params: <None>
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Name: lirc-rpi
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-Info: Configures lirc-rpi (Linux Infrared Remote Control for Raspberry Pi)
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- Consult the module documentation for more details.
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-Load: dtoverlay=lirc-rpi,<param>=<val>
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-Params: gpio_out_pin GPIO for output (default "17")
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-
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- gpio_in_pin GPIO for input (default "18")
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-
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- gpio_in_pull Pull up/down/off on the input pin
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- (default "down")
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-
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- sense Override the IR receive auto-detection logic:
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- "0" = force active-high
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- "1" = force active-low
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- "-1" = use auto-detection
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- (default "-1")
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-
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- softcarrier Turn the software carrier "on" or "off"
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- (default "on")
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-
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- invert "on" = invert the output pin (default "off")
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-
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- debug "on" = enable additional debug messages
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- (default "off")
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+Info: This overlay has been deprecated and removed - see gpio-ir
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+Load: <Deprecated>
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Name: ltc294x
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