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

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@denx.de>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: Ia9bf7119785d49b633a3ae761c3dc4a30b92628a

diff --git a/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi b/arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
index 92345b7..6868769 100644 (file)
--- 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@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 dafcce4..a1d1b8d 100644 (file)
--- 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;