On Fri, Jun 20, 2025 at 9:55 PM Andre Przywara [off-list ref] wrote:

On Fri, 20 Jun 2025 01:30:06 +0800
Chen-Yu Tsai [off-list ref] wrote:

quoted

From: Chen-Yu Tsai <redacted>

UART1 is normally used to connect to the Bluetooth side of a Broadcom
WiFi+BT combo chip. The connection uses 4 pins.

Add pinmux nodes for UART1, one for the RX/TX pins, and one for the
RTS/CTS pins.

Interestingly there is only one possible set of pins for UART1, so the
naming is correct. Which would also mean we can insert the pinctrl-0
property in the UART DT node in the .dtsi file already.

I'd leave it to the user, since it's possible to use it in either 2 pin
or 4 pin configuration.

Regardless, checked against the manual:

quoted

Signed-off-by: Chen-Yu Tsai <redacted>

Reviewed-by: Andre Przywara <andre.przywara@arm.com>

Thanks!
ChenYu

Cheers,
Andre

quoted

---
 arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
index 30613a0b1124..6f62201fd739 100644
--- a/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun55i-a523.dtsi

@@ -168,6 +168,20 @@ uart0_pb_pins: uart0-pb-pins {
                              allwinner,pinmux = <2>;
                              function = "uart0";
                      };
+
+                     /omit-if-no-ref/
+                     uart1_pins: uart1-pins {
+                             pins = "PG6", "PG7";
+                             function = "uart1";
+                             allwinner,pinmux = <2>;
+                     };
+
+                     /omit-if-no-ref/
+                     uart1_rts_cts_pins: uart1-rts-cts-pins {
+                             pins = "PG8", "PG9";
+                             function = "uart1";
+                             allwinner,pinmux = <2>;
+                     };
              };

              ccu: clock-controller@2001000 {