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@xxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Thanks
Andrew
> ---
> 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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