With newer kernels (>=3.18) that supports device-trees I2C
should be enabled with device-trees.
This is now support by adding:
ENABLE_I2C = "1"
in local.conf
This will enable the dtparams:
i2c1
i2c_arm
Signed-off-by: Petter Mabäcker <pet...@technux.se>
---
README | 21 +++++++++++++--------
recipes-bsp/bootfiles/rpi-config_git.bb | 6 ++++++
2 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/README b/README
index a168692..8ef4e7a 100644
--- a/README
+++ b/README
@@ -21,10 +21,11 @@ Contents:
2.G. Optional - Enable offline compositing support
2.H. Optional - Enable kgdb over console support
2.I. Optional - Enable SPI bus
- 2.J. Images
- 2.K. Boot to U-Boot
- 2.L. Image with Initramfs
- 2.M. Device tree support
+ 2.J. Optional - Enable I2C
+ 2.K. Images
+ 2.L. Boot to U-Boot
+ 2.M. Image with Initramfs
+ 2.N. Device tree support
3. Extra apps
3.A. omxplayer
4. Source code and mirrors
@@ -151,8 +152,12 @@ ENABLE_KGDB = "1"
When using device tree kernels, set this variable to enable the SPI bus
ENABLE_SPI_BUS = "1"
+2.J. Optional - Enable I2C
+==========================
+When using device tree kernels, set this variable to enable I2C
+ENABLE_I2C = "1"
-2.J. Images
+2.K. Images
===========
* rpi-hwup-image
Hardware up image
@@ -162,7 +167,7 @@ ENABLE_SPI_BUS = "1"
Image based on rpi-basic-image which includes most of the packages in this
layer and some media samples.
-2.K. Boot to U-Boot
+2.L. Boot to U-Boot
===================
To have u-boot load kernel image, set in your local.conf
KERNEL_IMAGETYPE = "uImage"
@@ -170,7 +175,7 @@ KERNEL_IMAGETYPE = "uImage"
This will make kernel.img be u-boot image which will load uImage.
By default, kernel.img is the actual kernel image (ex. Image).
-2.L. Image with Initramfs
+2.M. Image with Initramfs
=========================
To build an initramfs image :
* Set this 3 kernel variables (in linux-raspberrypi.inc for example)
@@ -183,7 +188,7 @@ To build an initramfs image :
* Set the meta-rasberrypi variable (in raspberrypi.conf for example)
- KERNEL_INITRAMFS = "-initramfs"
-2.M. Device tree support
+2.N. Device tree support
=========================
Device tree for RPi is only supported when using linux-raspberrypi 3.18+
kernels.
diff --git a/recipes-bsp/bootfiles/rpi-config_git.bb
b/recipes-bsp/bootfiles/rpi-config_git.bb
index aa11b25..ccb9b7f 100644
--- a/recipes-bsp/bootfiles/rpi-config_git.bb
+++ b/recipes-bsp/bootfiles/rpi-config_git.bb
@@ -72,6 +72,12 @@ do_deploy() {
echo "# Enable SPI bus" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
echo "dtparam=spi=on" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
fi
+
+ if [ -n "${ENABLE_I2C}" ]; then
+ echo "# Enable I2C" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+ echo "dtparam=i2c1=on" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+ echo "dtparam=i2c_arm=on" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
+ fi
}
addtask deploy before do_package after do_install
--
1.9.1
--
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