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board: ti: am335x-ice: Configure the CDCE913 clock synthesizer

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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>
This commit is contained in:
Tero Kristo 2019-09-27 19:14:29 +03:00 committed by Tom Rini
parent 9850d4e52f
commit 752a45a153
3 changed files with 27 additions and 0 deletions
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21
arch/arm/dts/am335x-icev2-u-boot.dtsi Normal file
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@ -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>;
};
};

4
board/ti/am335x/board.c
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@ -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

2
configs/am335x_evm_defconfig
View File

@ -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