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board: ti: am43xx-idk: Configure the CDCE913 clock synthesizer

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AM43xx-IDK 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 19:14:28 +03:00 committed by Tom Rini
parent e8e683d33b
commit 9850d4e52f
3 changed files with 21 additions and 0 deletions
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14
arch/arm/dts/am437x-idk-evm-u-boot.dtsi
View File

@ -9,6 +9,12 @@
ocp {
u-boot,dm-spl;
};
xtal25mhz: xtal25mhz {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <25000000>;
};
};
&uart0 {
@ -17,6 +23,14 @@
&i2c0 {
u-boot,dm-spl;
cdce913: cdce913@65 {
compatible = "ti,cdce913";
reg = <0x65>;
clocks = <&xtal25mhz>;
#clock-cells = <1>;
xtal-load-pf = <0>;
};
};
&mmc1 {

5
board/ti/am43xx/board.c
View File

@ -720,6 +720,7 @@ static int device_okay(const char *path)
int board_late_init(void)
{
struct udevice *dev;
#ifdef CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
set_board_info_env(NULL);
@ -737,6 +738,10 @@ int board_late_init(void)
if (device_okay("/ocp/omap_dwc3@483c0000"))
enable_usb_clocks(1);
#endif
/* Just probe the potentially supported cdce913 device */
uclass_get_device(UCLASS_CLK, 0, &dev);
return 0;
}
#endif

2
configs/am43xx_evm_defconfig
View File

@ -78,3 +78,5 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0403
CONFIG_USB_GADGET_PRODUCT_NUM=0xbd00
CONFIG_USB_GADGET_DOWNLOAD=y
CONFIG_USB_ETHER=y
CONFIG_CLK=y
CONFIG_CLK_CDCE9XX=y