Hi Miquel,
On ven., oct. 06 2017, Miquel Raynal <miquel.raynal@xxxxxxxxxxxxxxxxxx> wrote:
> Fill ESPRESSObin uart0 node with pinctrl information like in the
> Armada-3720-DB device tree (which uses the same node).
>
> Also explain how to enable the second UART port available on the
> headers. This second port is not enabled by default because both
> headers are dedicated to expose general purpose pins and remapping
> some of them to use the second UART would break existing users.
>
> Suggested-by: László ÁSHIN <laszlo@xxxxxxxx>
> Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxxxxxxxxx>
> ---
> arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
> index 2ce52ba74f73..c05b274ab1a9 100644
> --- a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
> +++ b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dts
> @@ -98,9 +98,17 @@
>
> /* Exported on the micro USB connector J5 through an FTDI */
> &uart0 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&uart1_pins>;
> status = "okay";
> };
>
> +/*
> + * Enabling the second UART on J17 (pins 24,26) is just a matter of copying the
> + * uart1 node from armada-3720-db.dts with one difference: it works with 1.8V
> + * TTL levels.
This difference is not related to the device tree. So I would write:
/*
* To enable the second UART on J17 (pins 24,26) refer to the uart1
* node from armada-3720-db.dts.
* Note that TX and RX signal are the ones coming directly from the SoC:
* 1.8V TTL.
*/
Thanks,
Gregory
> + */
> +
> /* J7 */
> &usb3 {
> status = "okay";
> --
> 2.11.0
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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