[PATCH 2/3] riscv: dts: spacemit: k1: Split gmac_clk_ref into independent pinctrl groups

[Junhui Liu <junhui.liu@pigmoral.tech>]

The gmac_clk_ref signal is optional for the GMAC controller and is not
strictly required for all hardware designs. In several already
upstreamed K1 boards, this signal remains unconnected or the
corresponding resistor is marked as NC.

Furthermore, the pins for gmac0_clk_ref (GPIO 45) and gmac1_clk_ref
(GPIO 46) may be used as GPIOs for other functions even when the
Ethernet controller is active. Splitting these into independent groups
avoids pinmux conflicts and allows boards to use the reference clock
signal only when it is actually needed.

Fixes: 60775f28cfb7 ("riscv: dts: spacemit: Add Ethernet support for K1")
Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
---
 arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
index 4e9a62d0e85b..8c57ca05dabd 100644
--- a/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi
@@ -27,8 +27,16 @@ gmac0-pins {
 				 <K1_PADCONF(11, 1)>,	/* gmac0_tx_en */
 				 <K1_PADCONF(12, 1)>,	/* gmac0_mdc */
 				 <K1_PADCONF(13, 1)>,	/* gmac0_mdio */
-				 <K1_PADCONF(14, 1)>,	/* gmac0_int_n */
-				 <K1_PADCONF(45, 1)>;	/* gmac0_clk_ref */
+				 <K1_PADCONF(14, 1)>;	/* gmac0_int_n */
+
+			bias-pull-up = <0>;
+			drive-strength = <21>;
+		};
+	};
+
+	gmac0_clk_ref_cfg: gmac0-clk-ref-cfg {
+		gmac0-clk-ref-pins {
+			pinmux = <K1_PADCONF(45, 1)>;	/* gmac0_clk_ref */
 
 			bias-pull-up = <0>;
 			drive-strength = <21>;
@@ -51,8 +59,16 @@ gmac1-pins {
 				 <K1_PADCONF(40, 1)>,	/* gmac1_tx_en */
 				 <K1_PADCONF(41, 1)>,	/* gmac1_mdc */
 				 <K1_PADCONF(42, 1)>,	/* gmac1_mdio */
-				 <K1_PADCONF(43, 1)>,	/* gmac1_int_n */
-				 <K1_PADCONF(46, 1)>;	/* gmac1_clk_ref */
+				 <K1_PADCONF(43, 1)>;	/* gmac1_int_n */
+
+			bias-pull-up = <0>;
+			drive-strength = <21>;
+		};
+	};
+
+	gmac1_clk_ref_cfg: gmac1-clk-ref-cfg {
+		gmac1-clk-ref-pins {
+			pinmux = <K1_PADCONF(46, 1)>;	/* gmac1_clk_ref */
 
 			bias-pull-up = <0>;
 			drive-strength = <21>;

-- 
2.54.0