Changes between Version 23 and Version 24 of linux/devicetree

Timestamp:

09/16/2025 11:05:34 PM (7 weeks ago)

Author:

Ryan Erbstoesser

Comment:

add note about examples

linux/devicetree

@@ -164 +164 @@
 
 Examples:
- 1. add a SPI NOR flash device on an off-board SPI connector. Such a device has a Linux kernel driver and requires using device-tree bindings:
+ 1. Add a SPI NOR flash device on an off-board SPI connector. Such a device has a Linux kernel driver and requires using device-tree bindings:
 {{{
 /dts-v1/;
@@ -198 +198 @@
 }}}
 
- 2. repurpose the I2C3 and SPI2 pins on a GW730x to GPIO's to be used in userspace via gpiod/sysfs:
+ 2. Repurpose the I2C3 and SPI2 pins on a GW730x to GPIO's to be used in userspace via gpiod/sysfs:
   - the dts framgment here has C style includes required for the pinmux definitions and the gpio definitions so we use cpp to pre-process it before compiling
   - the includes here are from the Linux kernel so you must have the linux kernel source to compile this, place the file in the proper directory per the includes (imx8mm-pinfunc.h is in arch/arm64/boot/dts/freescale so that is where we put the file in our example), and compile from the correct directory such that the includes can be found
@@ -312 +312 @@
 }}}
 
- 3. repurpose the I2C3 and SPI2 pins on a GW730x to GPIO's (like above) but bind 4 of them to the gpio-keys driver to use as up/down/right/left buttons and bind 2 of them to the gpio-led driver to use as leds via /sys/class/led
+ 3. Repurpose the I2C3 and SPI2 pins on a GW730x to GPIO's (like above) but bind 4 of them to the gpio-keys driver to use as up/down/right/left buttons and bind 2 of them to the gpio-led driver to use as leds via /sys/class/led
   - the dts framgment here has C style includes required for the pinmux definitions and the gpio definitions so we use cpp to pre-process it before compiling
   - we use gpio-keys1 and led-controller1 node names so as not to collide with gpio-keys and led-controller nodes already defined in the gw73xx-0x device-tree
@@ -455 +455 @@
  * A list of optional files specified by {{{fdt_overlays}}} will be loaded and applied as overlays and if defined {{{fixfdt}}} will be run as well.
 
-
+==== Venice GW7300 GPIO Example
+
+An example of how to repurpose pins to get more GPIO pins on a Venice SBC, in this example the GW73xx. See the example in this section: [#DeviceTreeOverlaysakaFragments]
 ==== Venice GW7100 Example