[Buildroot] [git commit] linux: add fbtft kernel extension
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Sat Jan 10 14:25:31 UTC 2015
commit: http://git.buildroot.net/buildroot/commit/?id=9b2bbe3422d1e96eaf1e7f09743c325b48023ac2
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master
Tested with RaspberryPi B+ and PiTFT Mini Kit - 320x240 2.8" TFT
(see [1] and [2]) and the following target configuration changes:
- cmdline.txt: add 'fbcon=map:10 fbcon=font:VGA8x8'
- add /etc/modules-load.d/fbtft.conf with 'fbtft_device'
- add /etc/modprobe.d/00-fbtft.conf with 'options fbtft_device name=adafruit28 rotate=90 gpios=dc:25'
[1] http://h65951.serverkompetenz.net/PeterSeiderer/upload/PiTFT_2_8_ct/Image9893.jpg
[2] http://h65951.serverkompetenz.net/PeterSeiderer/upload/PiTFT_2_8_ct/Image9897.jpg
[Thomas:
- Rename prompt of the Linux extension to "FB TFT drivers"
- Remove the full name of the kernel config options in the help
text. Giving their CONFIG_<foo> name is enough.
- Remove the mention of CONFIG_SPI_BCM2708, since this makes the
description RaspberryPi specific, while these drivers can work
with any SPI controller.
- Refactor the code in linux-ext-fbtft.mk to avoid duplication
between the < 3.15 and >= 3.15 cases.
- Make the fbtft package a promptless package, since there is no
point in selecting only this package, without the kernel
extension.
- Change the license to GPLv2, since it's kernel code.]
Signed-off-by: Peter Seiderer <ps.report at gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
linux/Config.ext.in | 18 ++++++++++++++++++
linux/linux-ext-fbtft.mk | 28 ++++++++++++++++++++++++++++
package/Config.in | 1 +
package/fbtft/Config.in | 13 +++++++++++++
package/fbtft/fbtft.mk | 11 +++++++++++
5 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/linux/Config.ext.in b/linux/Config.ext.in
index 40c4684..8f15687 100644
--- a/linux/Config.ext.in
+++ b/linux/Config.ext.in
@@ -42,4 +42,22 @@ config BR2_LINUX_KERNEL_EXT_RTAI_PATCH
help
Optionally, explicitly specify the RTAI patch to use.
+# fbtft
+config BR2_LINUX_KERNEL_EXT_FBTFT
+ bool "FB TFT drivers"
+ select BR2_PACKAGE_FBTFT
+ help
+ Linux Framebuffer drivers for small TFT LCD display modules,
+ e.g. Adafruit PiTFT displays for Raspberry Pi.
+
+ To enable fbtft, e.g. for Adafruit 2.8 PiTFT, enable the
+ following kernel configurations:
+ - CONFIG_SPI
+ - CONFIG_GPIOLIB
+ - CONFIG_FB
+ - CONFIG_FB_TFT
+ - CONFIG_FB_TFT_ILI9341
+
+ https://github.com/notro/fbtft
+
endmenu
diff --git a/linux/linux-ext-fbtft.mk b/linux/linux-ext-fbtft.mk
new file mode 100644
index 0000000..36f4fd2
--- /dev/null
+++ b/linux/linux-ext-fbtft.mk
@@ -0,0 +1,28 @@
+################################################################################
+# Linux fbtft extensions
+#
+# Patch the linux kernel with fbtft extension
+################################################################################
+
+ifeq ($(BR2_LINUX_KERNEL_EXT_FBTFT),y)
+# Add dependency to fbtft package (download helper for the fbtft source)
+LINUX_DEPENDENCIES += fbtft
+
+# for linux >= 3.15 install to drivers/video/fbdev/fbtft
+# for linux < 3.15 install to drivers/video/fbtft
+define FBTFT_PREPARE_KERNEL
+ if [ -e $(LINUX_DIR)/drivers/video/fbdev ]; then \
+ dest=$(LINUX_DIR)/drivers/video/fbdev ; \
+ else \
+ dest=$(LINUX_DIR)/drivers/video/ ; \
+ fi ; \
+ mkdir -p $${dest}/fbtft; \
+ cp -dpfr $(FBTFT_DIR)/* $${dest}/fbtft/ ; \
+ echo 'source "drivers/video/fbdev/fbtft/Kconfig"' \
+ >> $${dest}/Kconfig ; \
+ echo 'obj-y += fbtft/' >> $${dest}/Makefile
+endef
+
+LINUX_PRE_PATCH_HOOKS += FBTFT_PREPARE_KERNEL
+
+endif #BR2_LINUX_KERNEL_EXT_FBTFT
diff --git a/package/Config.in b/package/Config.in
index 08fa31d..878aa72 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -313,6 +313,7 @@ endif
source "package/evemu/Config.in"
source "package/evtest/Config.in"
source "package/fan-ctrl/Config.in"
+ source "package/fbtft/Config.in"
source "package/fconfig/Config.in"
source "package/fis/Config.in"
source "package/flashrom/Config.in"
diff --git a/package/fbtft/Config.in b/package/fbtft/Config.in
new file mode 100644
index 0000000..0a4de19
--- /dev/null
+++ b/package/fbtft/Config.in
@@ -0,0 +1,13 @@
+# Prompt-less option, because this package is not doing anything
+# except downloading the FB TFT sources. The real work is done by a
+# Linux extension.
+config BR2_PACKAGE_FBTFT
+ bool
+ depends on BR2_LINUX_KERNEL
+ help
+ Linux Framebuffer drivers for small TFT LCD display modules,
+ e.g. Adafruit PiTFT displays for Raspberry Pi.
+
+ This is only the download helper for the kernel patch.
+
+ https://github.com/notro/fbtft
diff --git a/package/fbtft/fbtft.mk b/package/fbtft/fbtft.mk
new file mode 100644
index 0000000..913627d
--- /dev/null
+++ b/package/fbtft/fbtft.mk
@@ -0,0 +1,11 @@
+################################################################################
+#
+# fbtft
+#
+################################################################################
+
+FBTFT_VERSION = 274035404701245e7491c0c6471c5b72ade4d491
+FBTFT_SITE = $(call github,notro,fbtft,$(FBTFT_VERSION))
+FBTFT_LICENSE = GPLv2
+
+$(eval $(generic-package))
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