Hi all,
This patch series adds device tree overlays to use various serial ports
on expansion ports on the r8a7740/armadillo and r8a7791/koelsch
development boards.
This is an RFC for various reasons:
- Do we want to store device tree overlay sources in the kernel source
tree (see also the patch mentioned under dependencies)?
- The first two patches add aliases for all serial ports to the main
dts files, as of_alias_add() is not called yet when loading a device
tree overlay that adds an alias.
- The overlay sources use full paths to refer to the device nodes for
creating aliases, as path references (unlike phandle references) are
not yet supported by overlays.
- The "ctsrts" DT property is not yet documented.
- On Koelsch, SCIFB1 works for TX only. As SCIFB works on armadillo,
and the same pins work for HSCIF1 on koelsch, this may be a silly
pinctrl issue. Or not.
- As the EXIO connectors on koelsch carry i2c signals, we can go wild
and add i2c EEPROMs for identification, and implement a capemgr,
like on BeagleBone ;-)
How to use it, using overlay configfs:
- Copy your dtsos to /lib/firmware
- mkdir /sys/kernel/config/device-tree/overlays/scif3
- echo r8a7791-koelsch-exio-c-scif3.dtso >
/sys/kernel/config/device-tree/overlays/scif3/path
- Play with your new serial port
- rmdir /sys/kernel/config/device-tree/overlays/scif3
This depends on:
- https://github.com/pantoniou/linux-beagle-track-mainline.git#bbb-overlays
for overlay configfs.
- "[PATCH/RFC] kbuild: Create a rule for building device tree overlay
objects" (https://lkml.org/lkml/2015/5/12/343), for building the dtsos.
Thanks for your comments!
Geert Uytterhoeven (12):
ARM: shmobile: armadillo dts: Add aliases for all serial ports
ARM: shmobile: koelsch dts: Add aliases for all serial ports
ARM: shmobile: armadillo dts: Add overlay for SCIFA0 on CON15
ARM: shmobile: armadillo dts: Add overlay for SCIFB on CON15
ARM: shmobile: koelsch dts: Add overlay for HSCIF1 on EXIO A
ARM: shmobile: koelsch dts: Add overlay for HSCIF2 on EXIO A
ARM: shmobile: koelsch dts: Add overlay for SCIFB0 on EXIO A
ARM: shmobile: koelsch dts: Add overlay for SCIFB1 on EXIO A
ARM: shmobile: koelsch dts: Add overlay for SCIF3 on EXIO C
ARM: shmobile: koelsch dts: Add overlay for SCIF5 on EXIO C
ARM: shmobile: koelsch dts: Add overlay for SCIFA5(b) on EXIO C
ARM: shmobile: koelsch dts: Add overlay for SCIFA5(c) on EXIO C
arch/arm/boot/dts/Makefile | 14 +++++
.../dts/r8a7740-armadillo800eva-con15-scifa0.dtso | 53 +++++++++++++++++++
.../dts/r8a7740-armadillo800eva-con15-scifb.dtso | 52 +++++++++++++++++++
arch/arm/boot/dts/r8a7740-armadillo800eva.dts | 8 +++
.../boot/dts/r8a7791-koelsch-exio-a-hscif1.dtso | 49 ++++++++++++++++++
.../boot/dts/r8a7791-koelsch-exio-a-hscif2.dtso | 53 +++++++++++++++++++
.../boot/dts/r8a7791-koelsch-exio-a-scifb0.dtso | 53 +++++++++++++++++++
.../boot/dts/r8a7791-koelsch-exio-a-scifb1.dtso | 51 ++++++++++++++++++
.../arm/boot/dts/r8a7791-koelsch-exio-c-scif3.dtso | 60 ++++++++++++++++++++++
.../arm/boot/dts/r8a7791-koelsch-exio-c-scif5.dtso | 60 ++++++++++++++++++++++
.../boot/dts/r8a7791-koelsch-exio-c-scifa5-b.dtso | 60 ++++++++++++++++++++++
.../boot/dts/r8a7791-koelsch-exio-c-scifa5-c.dtso | 60 ++++++++++++++++++++++
arch/arm/boot/dts/r8a7791-koelsch.dts | 16 ++++++
13 files changed, 589 insertions(+)
create mode 100644 arch/arm/boot/dts/r8a7740-armadillo800eva-con15-scifa0.dtso
create mode 100644 arch/arm/boot/dts/r8a7740-armadillo800eva-con15-scifb.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-a-hscif1.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-a-hscif2.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-a-scifb0.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-a-scifb1.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-c-scif3.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-c-scif5.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-c-scifa5-b.dtso
create mode 100644 arch/arm/boot/dts/r8a7791-koelsch-exio-c-scifa5-c.dtso
--
1.9.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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