AM335x-ICE boards contain the CDCE913 clock synthesizer, and their reset crystal capacitance load value of 10pF is wrong leading into lost packets in certain networking tests. Add DT data for this device, and probe it from the board file to program the crystal capacitance load value to 0pF to avoid any problems.
Signed-off-by: Tero Kristo t-kristo@ti.com --- arch/arm/dts/am335x-icev2-u-boot.dtsi | 21 +++++++++++++++++++++ board/ti/am335x/board.c | 4 ++++ configs/am335x_evm_defconfig | 2 ++ 3 files changed, 27 insertions(+) create mode 100644 arch/arm/dts/am335x-icev2-u-boot.dtsi
diff --git a/arch/arm/dts/am335x-icev2-u-boot.dtsi b/arch/arm/dts/am335x-icev2-u-boot.dtsi new file mode 100644 index 0000000000..cc9569af03 --- /dev/null +++ b/arch/arm/dts/am335x-icev2-u-boot.dtsi @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ + */ +/ { + xtal25mhz: xtal25mhz { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <25000000>; + }; +}; + +&i2c0 { + cdce913: cdce913@65 { + compatible = "ti,cdce913"; + reg = <0x65>; + clocks = <&xtal25mhz>; + #clock-cells = <1>; + xtal-load-pf = <0>; + }; +}; diff --git a/board/ti/am335x/board.c b/board/ti/am335x/board.c index 7eaa6cd96d..499c872227 100644 --- a/board/ti/am335x/board.c +++ b/board/ti/am335x/board.c @@ -791,6 +791,7 @@ int board_init(void) #ifdef CONFIG_BOARD_LATE_INIT int board_late_init(void) { + struct udevice *dev; #if !defined(CONFIG_SPL_BUILD) uint8_t mac_addr[6]; uint32_t mac_hi, mac_lo; @@ -871,6 +872,9 @@ int board_late_init(void) env_set("serial#", board_serial); }
+ /* Just probe the potentially supported cdce913 device */ + uclass_get_device(UCLASS_CLK, 0, &dev); + return 0; } #endif diff --git a/configs/am335x_evm_defconfig b/configs/am335x_evm_defconfig index 2aa9b65caf..93a28b290b 100644 --- a/configs/am335x_evm_defconfig +++ b/configs/am335x_evm_defconfig @@ -77,3 +77,5 @@ CONFIG_DYNAMIC_CRC_TABLE=y CONFIG_RSA=y CONFIG_LZO=y # CONFIG_OF_LIBFDT_OVERLAY is not set +CONFIG_CLK=y +CONFIG_CLK_CDCE9XX=y