@@ -1,5 +1,10 @@
dtb-$(CONFIG_ARCH_RCAR_GEN3) += r8a7795-salvator-x.dtb
+ifeq ($(CONFIG_OF_OVERLAY),y)
+dtb-$(CONFIG_ARCH_RCAR_GEN3) += \
+ r8a7795-salvator-x-hscif1.dtbo
+endif
+
always := $(dtb-y)
subdir-y := $(dts-dirs)
clean-files := *.dtb
new file mode 100644
@@ -0,0 +1,57 @@
+/*
+ * Device Tree Overlay for HSCIF1 on r8a7795/Salvator-X Debug Serial 1
+ *
+ * Copyright (C) 2015 Glider bvba
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ * Notes:
+ * - As these pins are shared with SCIF1, the latter is disabled first.
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ fragment@0 {
+ target-path = "/aliases";
+
+ __overlay__ {
+ /* serial1 = &hscif1; */
+ serial1 = "/soc/serial@e6550000";
+ };
+ };
+
+ fragment@1 {
+ target = <&pfc>;
+
+ __overlay__ {
+ hscif1_pins: hscif1 {
+ renesas,groups = "hscif1_data_a",
+ "hscif1_ctrl_a";
+ renesas,function = "hscif1";
+ };
+ };
+ };
+
+ fragment@2 {
+ target = <&scif1>;
+
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@3 {
+ target = <&hscif1>;
+
+ __overlay__ {
+ pinctrl-0 = <&hscif1_pins>;
+ pinctrl-names = "default";
+
+ status = "okay";
+ };
+ };
+};
On r8a7795/Salvator-X, both SCIF1 and HSCIF1 can be routed to the "DEBUG SERIAL-1" connector. The standard DTS provides access to SCIF1. Add an overlay to use HSCIF1 instead. Not-yet-signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- This is a proof-of-concept, which depends on: - https://github.com/pantoniou/linux-beagle-track-mainline.git#bbb-overlays, - kbuild: Create a rule for building device tree overlay objects (https://lkml.org/lkml/2015/5/12/343), - Passing -@ to dtc, - [RFC] of/dynamic: Update list of aliases on aliases changes. --- arch/arm64/boot/dts/renesas/Makefile | 5 ++ .../dts/renesas/r8a7795-salvator-x-hscif1.dtso | 57 ++++++++++++++++++++++ 2 files changed, 62 insertions(+) create mode 100644 arch/arm64/boot/dts/renesas/r8a7795-salvator-x-hscif1.dtso