[PATCH] ARM: dts: stm32: Switch to MCO2 for PHY 50 MHz clock

[Marek Vasut]

The LAN8710i PHY currently uses 50 MHz clock direct from PLL4P.
To permit PLL4P to run at faster frequency, use MCO2 as a divider.
The PLL4P runs at 100 MHz, supplies MCO2 which divides it by 2 to
50MHz, and supplies the PHY with 50 MHz via pin PG2. The feedback
clock are fed back in via pin PA1.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Patrice Chotard <patrice.chotard at st.com>
Cc: Patrick Delaunay <patrick.delaunay at st.com>
---
NOTE: This is for next
---
 arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi | 25 +++++++++++++++++-----
 arch/arm/dts/stm32mp15xx-dhcom.dtsi        |  3 +--
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
index 92345b7ba3..6868769c6e 100644
--- a/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
@@ -72,8 +72,8 @@
 
 &pinctrl {
 	/* These should bound to FMC2 bus driver, but we do not have one */
-	pinctrl-0 = <&fmc_pins_b>;
-	pinctrl-1 = <&fmc_sleep_pins_b>;
+	pinctrl-0 = <&fmc_pins_b &mco2_pins_a>;
+	pinctrl-1 = <&fmc_sleep_pins_b &mco2_sleep_pins_a>;
 	pinctrl-names = "default", "sleep";
 
 	fmc_pins_b: fmc-0 {
@@ -130,6 +130,21 @@
 				 <STM32_PINMUX('G', 12, ANALOG)>; /* FMC_NE4 */
 		};
 	};
+
+	mco2_pins_a: mco2-0 {
+		pins {
+			pinmux = <STM32_PINMUX('G', 2, AF1)>; /* MCO2 */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <2>;
+		};
+	};
+
+	mco2_sleep_pins_a: mco2-sleep-0 {
+		pins {
+			pinmux = <STM32_PINMUX('G', 2, ANALOG)>; /* MCO2 */
+		};
+	};
 };
 
 &pmic {
@@ -181,7 +196,7 @@
 		CLK_PLL4_HSE
 		CLK_RTC_LSE
 		CLK_MCO1_DISABLED
-		CLK_MCO2_DISABLED
+		CLK_MCO2_PLL4P
 	>;
 
 	st,clkdiv = <
@@ -195,7 +210,7 @@
 		2 /*APB5*/
 		23 /*RTC*/
 		0 /*MCO1*/
-		0 /*MCO2*/
+		1 /*MCO2*/
 	>;
 
 	st,pkcs = <
@@ -258,7 +273,7 @@
 	pll4: st,pll at 3 {
 		compatible = "st,stm32mp1-pll";
 		reg = <3>;
-		cfg = < 1 49 11 11 11 PQR(1,1,1) >;
+		cfg = < 1 49 5 11 11 PQR(1,1,1) >;
 		u-boot,dm-pre-reloc;
 	};
 };
diff --git a/arch/arm/dts/stm32mp15xx-dhcom.dtsi b/arch/arm/dts/stm32mp15xx-dhcom.dtsi
index dafcce4323..a1d1b8dec7 100644
--- a/arch/arm/dts/stm32mp15xx-dhcom.dtsi
+++ b/arch/arm/dts/stm32mp15xx-dhcom.dtsi
@@ -58,7 +58,6 @@
 	phy-mode = "rmii";
 	max-speed = <100>;
 	phy-handle = <&phy0>;
-	st,eth_ref_clk_sel;
 	phy-reset-gpios = <&gpioh 15 GPIO_ACTIVE_LOW>;
 
 	mdio0 {
@@ -267,7 +266,7 @@
 			pinmux = <STM32_PINMUX('G', 13, AF11)>, /* ETH1_RMII_TXD0 */
 				 <STM32_PINMUX('G', 14, AF11)>, /* ETH1_RMII_TXD1 */
 				 <STM32_PINMUX('B', 11, AF11)>, /* ETH1_RMII_TX_EN */
-				 <STM32_PINMUX('A', 1, AF0)>,   /* ETH1_RMII_REF_CLK */
+				 <STM32_PINMUX('A', 1, AF11)>,  /* ETH1_RMII_REF_CLK */
 				 <STM32_PINMUX('A', 2, AF11)>,  /* ETH1_MDIO */
 				 <STM32_PINMUX('C', 1, AF11)>;  /* ETH1_MDC */
 			bias-disable;
-- 
2.29.2