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| author | Aaro Koskinen <aaro.koskinen@iki.fi> | 2016-01-23 22:37:17 +0200 |
|---|---|---|
| committer | Gregory CLEMENT <gregory.clement@free-electrons.com> | 2016-02-09 11:00:25 +0100 |
| commit | 39ac0979de635c8be94e1353afde65524ac1ed03 (patch) | |
| tree | 1e690cfbb77c32c4e1383d759940836f6a6fa95b | |
| parent | 60ff189ca05dedac97af8d9e51c285a44bc9e5a5 (diff) | |
| download | lwn-39ac0979de635c8be94e1353afde65524ac1ed03.tar.gz lwn-39ac0979de635c8be94e1353afde65524ac1ed03.zip | |
ARM: dts: kirkwood: provide template for RS-232/485 configuration for OpenRD
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>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
| -rw-r--r-- | arch/arm/boot/dts/kirkwood-openrd.dtsi | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/kirkwood-openrd.dtsi b/arch/arm/boot/dts/kirkwood-openrd.dtsi index f65b7273bb0a..24f1d30970a0 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"; }; |