Some OpenRD boards have RS-232 and RS-486 connectors wired, but using them
needs a custom DTB as the current DTB configures SD card slot instead.
This patch adds documentation into the DTS on how to change
the configuration.
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
---
arch/arm/boot/dts/kirkwood-openrd.dtsi | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/kirkwood-openrd.dtsi b/arch/arm/boot/dts/kirkwood-openrd.dtsi
index f65b727..24f1d30 100644
--- a/arch/arm/boot/dts/kirkwood-openrd.dtsi
+++ b/arch/arm/boot/dts/kirkwood-openrd.dtsi
@@ -40,7 +40,7 @@
pinctrl-0 = <&pmx_select28 &pmx_sdio_cd &pmx_select34>;
pinctrl-names = "default";
- pmx_select28: pmx-select-rs232-rs484 {
+ pmx_select28: pmx-select-rs232-rs485 {
marvell,pins = "mpp28";
marvell,function = "gpio";
};
@@ -65,10 +65,39 @@
status = "okay";
cd-gpios = <&gpio0 29 9>;
};
+ gpio@10100 {
+ p28 {
+ gpio-hog;
+ gpios = <28 GPIO_ACTIVE_HIGH>;
+ /*
+ * SelRS232or485 selects between RS-232 or RS-485
+ * mode for the second UART.
+ *
+ * Low: RS-232
+ * High: RS-485
+ *
+ * To use the second UART, you need to change also
+ * the SelUARTorSD.
+ */
+ output-low;
+ line-name = "SelRS232or485";
+ };
+ };
gpio@10140 {
p2 {
gpio-hog;
gpios = <2 GPIO_ACTIVE_HIGH>;
+ /*
+ * SelUARTorSD selects between the second UART
+ * (serial@12100) and SD (mvsdio@90000).
+ *
+ * Low: UART
+ * High: SD
+ *
+ * When changing this line make sure the newly
+ * selected device node is enabled and the
+ * previously selected device node is disabled.
+ */
output-high; /* Select SD by default */
line-name = "SelUARTorSD";
};
--
2.4.0
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