riscv: dts: spacemit: add UART pinctrl combinations

Add UART pinctrl configurations based on the SoC datasheet and the
downstream Bianbu Linux tree. The drive strength values were taken from
the downstream implementation, which uses medium drive strength.
CTS/RTS are moved to separate *-cts-rts-cfg states so boards can enable
hardware flow control conditionally.

Signed-off-by: Hendrik Hamerlinck <hendrik.hamerlinck@hammernet.be>
Reviewed-by: Yixun Lan <dlan@gentoo.org>
Reviewed-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
Link: https://lore.kernel.org/r/20250917065907.160615-1-hendrik.hamerlinck@hammernet.be
Signed-off-by: Yixun Lan <dlan@gentoo.org>

1 files changed, 428 insertions, 2 deletions

diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
index aff19c86d5ff..ce7b899d4dd9 100644
--- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -59,11 +59,437 @@
 		};
 	};
 
+	/omit-if-no-ref/
+	uart0_0_cfg: uart0-0-cfg {
+		uart0-0-pins {
+			pinmux = <K1_PADCONF(104, 3)>,	/* uart0_txd */
+				 <K1_PADCONF(105, 3)>;	/* uart0_rxd */
+			power-source = <3300>;
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart0_1_cfg: uart0-1-cfg {
+		uart0-1-pins {
+			pinmux = <K1_PADCONF(108, 1)>,	/* uart0_txd */
+				 <K1_PADCONF(80, 3)>;	/* uart0_rxd */
+			power-source = <3300>;
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+		};
+	};
+
+	/omit-if-no-ref/
 	uart0_2_cfg: uart0-2-cfg {
 		uart0-2-pins {
-			pinmux = <K1_PADCONF(68, 2)>,
-				 <K1_PADCONF(69, 2)>;
+			pinmux = <K1_PADCONF(68, 2)>,	/* uart0_txd */
+				 <K1_PADCONF(69, 2)>;	/* uart0_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart2_0_cfg: uart2-0-cfg {
+		uart2-0-pins {
+			pinmux = <K1_PADCONF(21, 1)>,	/* uart2_txd */
+				 <K1_PADCONF(22, 1)>;	/* uart2_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart2_0_cts_rts_cfg: uart2-0-cts-rts-cfg {
+		uart2-0-pins {
+			pinmux = <K1_PADCONF(23, 1)>,	/* uart2_cts */
+				 <K1_PADCONF(24, 1)>;	/* uart2_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart3_0_cfg: uart3-0-cfg {
+		uart3-0-pins {
+			pinmux = <K1_PADCONF(81, 2)>,	/* uart3_txd */
+				 <K1_PADCONF(82, 2)>;	/* uart3_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart3_0_cts_rts_cfg: uart3-0-cts-rts-cfg {
+		uart3-0-pins {
+			pinmux = <K1_PADCONF(83, 2)>,	/* uart3_cts */
+				 <K1_PADCONF(84, 2)>;	/* uart3_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart3_1_cfg: uart3-1-cfg {
+		uart3-1-pins {
+			pinmux = <K1_PADCONF(18, 2)>,	/* uart3_txd */
+				 <K1_PADCONF(19, 2)>;	/* uart3_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart3_1_cts_rts_cfg: uart3-1-cts-rts-cfg {
+		uart3-1-pins {
+			pinmux = <K1_PADCONF(20, 2)>,	/* uart3_cts */
+				 <K1_PADCONF(21, 2)>;	/* uart3_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart3_2_cfg: uart3-2-cfg {
+		uart3-2-pins {
+			pinmux = <K1_PADCONF(53, 4)>,	/* uart3_txd */
+				 <K1_PADCONF(54, 4)>;	/* uart3_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart3_2_cts_rts_cfg: uart3-2-cts-rts-cfg {
+		uart3-2-pins {
+			pinmux = <K1_PADCONF(55, 4)>,	/* uart3_cts */
+				 <K1_PADCONF(56, 4)>;	/* uart3_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_0_cfg: uart4-0-cfg {
+		uart4-0-pins {
+			pinmux = <K1_PADCONF(100, 4)>,	/* uart4_txd */
+				 <K1_PADCONF(101, 4)>;	/* uart4_rxd */
+			power-source = <3300>;
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_1_cfg: uart4-1-cfg {
+		uart4-1-pins {
+			pinmux = <K1_PADCONF(83, 3)>,	/* uart4_txd */
+				 <K1_PADCONF(84, 3)>;	/* uart4_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_1_cts_rts_cfg: uart4-1-cts-rts-cfg {
+		uart4-1-pins {
+			pinmux = <K1_PADCONF(81, 3)>,	/* uart4_cts */
+				 <K1_PADCONF(82, 3)>;	/* uart4_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_2_cfg: uart4-2-cfg {
+		uart4-2-pins {
+			pinmux = <K1_PADCONF(23, 2)>,	/* uart4_txd */
+				 <K1_PADCONF(24, 2)>;	/* uart4_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_3_cfg: uart4-3-cfg {
+		uart4-3-pins {
+			pinmux = <K1_PADCONF(33, 2)>,	/* uart4_txd */
+				 <K1_PADCONF(34, 2)>;	/* uart4_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_3_cts_rts_cfg: uart4-3-cts-rts-cfg {
+		uart4-3-pins {
+			pinmux = <K1_PADCONF(35, 2)>,	/* uart4_cts */
+				 <K1_PADCONF(36, 2)>;	/* uart4_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_4_cfg: uart4-4-cfg {
+		uart4-4-pins {
+			pinmux = <K1_PADCONF(111, 4)>,	/* uart4_txd */
+				 <K1_PADCONF(112, 4)>;	/* uart4_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart4_4_cts_rts_cfg: uart4-4-cts-rts-cfg {
+		uart4-4-pins {
+			pinmux = <K1_PADCONF(113, 4)>,	/* uart4_cts */
+				 <K1_PADCONF(114, 4)>;	/* uart4_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_0_cfg: uart5-0-cfg {
+		uart5-0-pins {
+			pinmux = <K1_PADCONF(102, 3)>,	/* uart5_txd */
+				 <K1_PADCONF(103, 3)>;	/* uart5_rxd */
+			power-source = <3300>;
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_1_cfg: uart5-1-cfg {
+		uart5-1-pins {
+			pinmux = <K1_PADCONF(25, 2)>,	/* uart5_txd */
+				 <K1_PADCONF(26, 2)>;	/* uart5_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_1_cts_rts_cfg: uart5-1-cts-rts-cfg {
+		uart5-1-pins {
+			pinmux = <K1_PADCONF(27, 2)>,	/* uart5_cts */
+				 <K1_PADCONF(28, 2)>;	/* uart5_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_2_cfg: uart5-2-cfg {
+		uart5-2-pins {
+			pinmux = <K1_PADCONF(42, 2)>,	/* uart5_txd */
+				 <K1_PADCONF(43, 2)>;	/* uart5_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_2_cts_rts_cfg: uart5-2-cts-rts-cfg {
+		uart5-2-pins {
+			pinmux = <K1_PADCONF(44, 2)>,	/* uart5_cts */
+				 <K1_PADCONF(45, 2)>;	/* uart5_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_3_cfg: uart5-3-cfg {
+		uart5-3-pins {
+			pinmux = <K1_PADCONF(70, 4)>,	/* uart5_txd */
+				 <K1_PADCONF(71, 4)>;	/* uart5_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart5_3_cts_rts_cfg: uart5-3-cts-rts-cfg {
+		uart5-3-pins {
+			pinmux = <K1_PADCONF(72, 4)>,	/* uart5_cts */
+				 <K1_PADCONF(73, 4)>;	/* uart5_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart6_0_cfg: uart6-0-cfg {
+		uart6-0-pins {
+			pinmux = <K1_PADCONF(86, 2)>,	/* uart6_txd */
+				 <K1_PADCONF(87, 2)>;	/* uart6_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart6_0_cts_rts_cfg: uart6-0-cts-rts-cfg {
+		uart6-0-pins {
+			pinmux = <K1_PADCONF(85, 2)>,	/* uart6_cts */
+				 <K1_PADCONF(90, 2)>;	/* uart6_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart6_1_cfg: uart6-1-cfg {
+		uart6-1-pins {
+			pinmux = <K1_PADCONF(0, 2)>,	/* uart6_txd */
+				 <K1_PADCONF(1, 2)>;	/* uart6_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart6_1_cts_rts_cfg: uart6-1-cts-rts-cfg {
+		uart6-1-pins {
+			pinmux = <K1_PADCONF(2, 2)>,	/* uart6_cts */
+				 <K1_PADCONF(3, 2)>;	/* uart6_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart6_2_cfg: uart6-2-cfg {
+		uart6-2-pins {
+			pinmux = <K1_PADCONF(56, 2)>,	/* uart6_txd */
+				 <K1_PADCONF(57, 2)>;	/* uart6_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart7_0_cfg: uart7-0-cfg {
+		uart7-0-pins {
+			pinmux = <K1_PADCONF(88, 2)>,	/* uart7_txd */
+				 <K1_PADCONF(89, 2)>;	/* uart7_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart7_1_cfg: uart7-1-cfg {
+		uart7-1-pins {
+			pinmux = <K1_PADCONF(4, 2)>,	/* uart7_txd */
+				 <K1_PADCONF(5, 2)>;	/* uart7_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart7_1_cts_rts_cfg: uart7-1-cts-rts-cfg {
+		uart7-1-pins {
+			pinmux = <K1_PADCONF(6, 2)>,	/* uart7_cts */
+				 <K1_PADCONF(7, 2)>;	/* uart7_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart8_0_cfg: uart8-0-cfg {
+		uart8-0-pins {
+			pinmux = <K1_PADCONF(82, 4)>,	/* uart8_txd */
+				 <K1_PADCONF(83, 4)>;	/* uart8_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart8_1_cfg: uart8-1-cfg {
+		uart8-1-pins {
+			pinmux = <K1_PADCONF(8, 2)>,	/* uart8_txd */
+				 <K1_PADCONF(9, 2)>;	/* uart8_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart8_1_cts_rts_cfg: uart8-1-cts-rts-cfg {
+		uart8-1-pins {
+			pinmux = <K1_PADCONF(10, 2)>,	/* uart8_cts */
+				 <K1_PADCONF(11, 2)>;	/* uart8_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart8_2_cfg: uart8-2-cfg {
+		uart8-2-pins {
+			pinmux = <K1_PADCONF(75, 4)>,	/* uart8_txd */
+				 <K1_PADCONF(76, 4)>;	/* uart8_rxd */
+			power-source = <3300>;
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart8_2_cts_rts_cfg: uart8-2-cts-rts-cfg {
+		uart8-2-pins {
+			pinmux = <K1_PADCONF(77, 4)>,	/* uart8_cts */
+				 <K1_PADCONF(78, 4)>;	/* uart8_rts */
+			power-source = <3300>;
+			bias-pull-up = <0>;
+			drive-strength = <19>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart9_0_cfg: uart9-0-cfg {
+		uart9-0-pins {
+			pinmux = <K1_PADCONF(12, 2)>,	/* uart9_txd */
+				 <K1_PADCONF(13, 2)>;	/* uart9_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart9_1_cfg: uart9-1-cfg {
+		uart9-1-pins {
+			pinmux = <K1_PADCONF(116, 3)>,	/* uart9_txd */
+				 <K1_PADCONF(117, 3)>;	/* uart9_rxd */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
+
+	/omit-if-no-ref/
+	uart9_1_cts_rts_cfg: uart9-1-cts-rts-cfg {
+		uart9-1-pins {
+			pinmux = <K1_PADCONF(110, 3)>,	/* uart9_cts */
+				 <K1_PADCONF(115, 3)>;	/* uart9_rts */
+			bias-pull-up = <0>;
+			drive-strength = <32>;
+		};
+	};
 
+	/omit-if-no-ref/
+	uart9_2_cfg: uart9-2-cfg {
+		uart9-2-pins {
+			pinmux = <K1_PADCONF(72, 2)>,	/* uart9_txd */
+				 <K1_PADCONF(73, 2)>;	/* uart9_rxd */
 			bias-pull-up = <0>;
 			drive-strength = <32>;
 		};