ARM: DTS: kirkwood-openrd: provide template for RS-232/485 configuration
PATCH 1/1 ARM: DTS: kirkwood-openrd: provide template for RS-232/485 configuration
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 <[email protected]>
--- arch/arm/boot/dts/kirkwood-openrd.dtsi | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-)
arch/arm/boot/dts/kirkwood-openrd.dtsi +30 -1
@@ -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"; };
Signature · 1 line
2.4.0
PATCH 1/1 ARM: DTS: kirkwood-openrd: provide template for RS-232/485 configuration
Quoted 7 lines · Aaro Koskinen
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 <[email protected]>
Reviewed-by Andrew Lunn <[email protected]>
Thanks
Andrew
Quoted 60 lines
--- arch/arm/boot/dts/kirkwood-openrd.dtsi | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-)arch/arm/boot/dts/kirkwood-openrd.dtsi +30
-1@@ -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"; };Signature · 1 line
2.4.0
PATCH 1/1 ARM: DTS: kirkwood-openrd: provide template for RS-232/485 configuration
In reply to Aaro KoskinenHi Aaro,
Quoted 7 lines · Aaro Koskinen
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 <[email protected]>
Applied on mvebu/dt with Andrew Reviewed-by tag
Thanks,
Gregory
Quoted 65 lines
--- arch/arm/boot/dts/kirkwood-openrd.dtsi | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-)arch/arm/boot/dts/kirkwood-openrd.dtsi +30
-1@@ -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"; };Signature · 7 lines
2.4.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
Signature · 4 lines
Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com