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

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>

diff --git a/arch/arm/dts/am437x-idk-evm-u-boot.dtsi b/arch/arm/dts/am437x-idk-evm-u-boot.dtsi
index 3aa9195..50fe09c 100644 (file)
--- a/arch/arm/dts/am437x-idk-evm-u-boot.dtsi
+++ b/arch/arm/dts/am437x-idk-evm-u-boot.dtsi
@@ -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 {

diff --git a/board/ti/am43xx/board.c b/board/ti/am43xx/board.c
index 2e09cc2..f5ecf87 100644 (file)
--- a/board/ti/am43xx/board.c
+++ b/board/ti/am43xx/board.c
@@ -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

diff --git a/configs/am43xx_evm_defconfig b/configs/am43xx_evm_defconfig
index 7c74047..7367c69 100644 (file)
--- a/configs/am43xx_evm_defconfig
+++ b/configs/am43xx_evm_defconfig
@@ -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