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Commit 39ac0979 authored by Aaro Koskinen's avatar Aaro Koskinen Committed by Gregory CLEMENT
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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: default avatarAaro Koskinen <aaro.koskinen@iki.fi>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
parent 60ff189c

arch/arm/boot/dts/kirkwood-openrd.dtsi

+30 −1
Original line number Diff line number Diff line
@@ -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";

			};