[PATCH] ARM: DTS: kirkwood-openrd: provide template for RS-232/485 configuration
From: andrew@lunn.ch (Andrew Lunn)
Date: 2016-01-24 17:28:21
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On Sat, Jan 23, 2016 at 10:37:17PM +0200, Aaro Koskinen wrote:
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@iki.fi>
Reviewed-by: Andrew Lunn <andrew@lunn.ch> Thanks Andrew
quoted hunk
--- 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 at 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 at 10140 { p2 { gpio-hog; gpios = <2 GPIO_ACTIVE_HIGH>; + /* + * SelUARTorSD selects between the second UART + * (serial at 12100) and SD (mvsdio at 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