Re: [PATCH] ARM: DTS: kirkwood-openrd: provide template for RS-232/485 configuration
From: Gregory CLEMENT <hidden>
Date: 2016-01-25 15:41:01
Also in:
linux-arm-kernel
Hi Aaro, On sam., janv. 23 2016, Aaro Koskinen [off-list ref] 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 <redacted>
Applied on mvebu/dt with Andrew Reviewed-by tag Thanks, Gregory
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@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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
-- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html