riscv: dts: spacemit: k1: Split gmac_clk_ref into independent pinctrl groups

The gmac_clk_ref signal is optional for the GMAC controller and is not
strictly required for all hardware designs. The pins for gmac0_clk_ref
(GPIO 45) and gmac1_clk_ref (GPIO 46) may also be used as GPIOs for
other functions even when the Ethernet controller is active.

Split the refclk pins into independent pinctrl groups so boards can
request them only when the reference clock path is actually needed.

Among the already mainlined boards, BPI-F3, Jupiter and MusePi Pro have
optional hardware paths for the GMAC refclk pins. BPI-F3 and Jupiter
route both GMAC refclk pins to the PHYs through NC/0R option resistors,
while MusePi Pro only does so for GMAC0. Keep referencing the new
clk-ref pinctrl groups on these boards so the optional hardware paths
remain usable if the option resistors are populated.

OrangePi R2S has no publicly available schematic, so also keep the
clk-ref groups there to preserve the previous pinmux behavior.

Fixes: 60775f28cfb7 ("riscv: dts: spacemit: Add Ethernet support for K1")
Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
Reviewed-by: Yixun Lan <dlan@kernel.org>
Link: https://patch.msgid.link/20260712-bpi-cm6-v3-2-8d1e2045179d@pigmoral.tech
Signed-off-by: Yixun Lan <dlan@kernel.org>

5 files changed, 27 insertions, 11 deletions

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
index 307a7e4a8943..e2961b7e0a3e 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
@@ -134,7 +134,7 @@
 	phy-handle = <&rgmii0>;
 	phy-mode = "rgmii-id";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gmac0_cfg>;
+	pinctrl-0 = <&gmac0_cfg>, <&gmac0_clk_ref_cfg>;
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <0>;
 	status = "okay";
@@ -157,7 +157,7 @@
 	phy-handle = <&rgmii1>;
 	phy-mode = "rgmii-id";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gmac1_cfg>;
+	pinctrl-0 = <&gmac1_cfg>, <&gmac1_clk_ref_cfg>;
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <250>;
 	status = "okay";
diff --git a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
index 2fc8d6533786..b61f5995ec77 100644
--- a/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts
@@ -121,7 +121,7 @@
 	phy-handle = <&rgmii0>;
 	phy-mode = "rgmii-id";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gmac0_cfg>;
+	pinctrl-0 = <&gmac0_cfg>, <&gmac0_clk_ref_cfg>;
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <0>;
 	status = "okay";
@@ -144,7 +144,7 @@
 	phy-handle = <&rgmii1>;
 	phy-mode = "rgmii-id";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gmac1_cfg>;
+	pinctrl-0 = <&gmac1_cfg>, <&gmac1_clk_ref_cfg>;
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <250>;
 	status = "okay";
diff --git a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
index 0d809e4ad3b1..3078ffb5cb87 100644
--- a/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-musepi-pro.dts
@@ -102,7 +102,7 @@
 &eth0 {
 	phy-handle = <&rgmii0>;
 	phy-mode = "rgmii-id";
-	pinctrl-0 = <&gmac0_cfg>;
+	pinctrl-0 = <&gmac0_cfg>, <&gmac0_clk_ref_cfg>;
 	pinctrl-names = "default";
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <0>;
diff --git a/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts b/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts
index b13a8d6a2670..dd72c33bd54c 100644
--- a/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-orangepi-r2s.dts
@@ -60,7 +60,7 @@
 	phy-handle = <&rgmii0>;
 	phy-mode = "rgmii-id";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gmac0_cfg>;
+	pinctrl-0 = <&gmac0_cfg>, <&gmac0_clk_ref_cfg>;
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <0>;
 	status = "okay";
@@ -84,7 +84,7 @@
 	phy-handle = <&rgmii1>;
 	phy-mode = "rgmii-id";
 	pinctrl-names = "default";
-	pinctrl-0 = <&gmac1_cfg>;
+	pinctrl-0 = <&gmac1_cfg>, <&gmac1_clk_ref_cfg>;
 	rx-internal-delay-ps = <0>;
 	tx-internal-delay-ps = <250>;
 	status = "okay";
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 @@
 				 <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 @@
 				 <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>;