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

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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
This commit is contained in:
Marek Vasut 2020-12-01 11:34:48 +01:00 • committed by Patrick Delaunay
parent 635e233b22
commit 69ea30e688
2 changed files with 21 additions and 7 deletions
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25
arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
View file

@ -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;
};
};

3
arch/arm/dts/stm32mp15xx-dhcom.dtsi
View file

@ -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;